INSTRUCTION MANUAL 
HF/VHF 
ALL MODE TRANSCEIVER 
i746PRO 
This device complies with Part 15 of the FCC rules. Operation is subject 
to the following two conditions: (1) This device may not cause 
harmful interference, and (2) this device must accept any interference 
received, including interference that may cause undesired operation.
FOREWORD 
We understand that you have a choice of many different 
radios in the market place. We want to take a couple 
of moments of your time to thank you for making 
the IC-746PRO your radio of choice, and hope you 
agree with Icom’s philosophy of “technology first”.Many 
hours of research and development went into the design 
of your IC-746PRO. 
Rather than completely redesigning all areas to create 
a new radio, the engineering team at Icom decided to 
follow in the footsteps of the IC-746 (one of the best 
value transceivers in the marketplace) with the new 
“PRO.” Focused on real world improvements compiled 
over the last few years from letters, phone calls, EMails 
and newsgroup postings, the engineering team 
at Icom is proud to say “many of these changes were 
compiled from a list of suggestions from you, the amateur 
radio operator!” 
FEATURES 
• 32-bit Floating point DSP and 24-bit AD/DA converter 
•DSP IF Filter creates 102 types of filter 
• All mode capability covering 160–2 m 
•100 Watt continuous duty cycle 
• All mode digital modulation and demodulation 
•RTTY demodulator and decoder 
•Twin Pass Band Tuning 
•RF speech compression with selectable pass band 
• Microphone Equalizer 
•SSB/CW synchronous tuning 
IMPORTANT 
READ THIS INSTRUCTION MANUAL 
CAREFULLY before attempting to operate the 
transceiver. 
SAVE THIS INSTRUCTION MANUAL. This 
manual contains important safety and operating instructions 
for the IC-746PRO. 
EXPLICIT DEFINITIONS 
DEFINITION WORD 
RWARNING 
Personal injury, fire hazard or electric 
shock may occur. 
CAUTION Equipment damage may occur. 
NOTE 
If disregarded, inconvenience only. No 
risk or personal injury, fire or electric 
shock. 
i 
PRECAUTIONS 
RWARNING RF EXPOSURE! This device emits 
Radio Frequency (RF) energy. Extreme caution should be 
observed when operating this device. If you have any 
questions regarding RF exposure and safety standards 
please refer to the Federal Communications Commission 
Office of Engineering and Technology’s report on Evaluating 
Compliance with FCC Guidelines for Human Radio 
Frequency Electromagnetic Fields (OET Bulletin 65). 
RWARNING HIGH VOLTAGE! NEVER attach an 
antenna or internal antenna connector during transmission. 
This may result in an electrical shock or burn. 
RNEVER apply AC to the [DC13.8V] jack on the transceiver 
rear panel. This could cause a fire or ruin the transceiver. 
RNEVER apply more than 16 V DC, such as a 24 V 
battery, to the [DC13.8V] jack on the transceiver rear 
panel. This could cause a fire or ruin the transceiver. 
RNEVER let metal, wire or other objects touch any internal 
part or connectors on the rear panel of the transceiver. 
This may result in an electric shock. 
NEVER expose the transceiver to rain, snow or any liquids. 
AVOID using or placing the transceiver in areas with temperatures 
below –10°C (+14°F) or above +60°C (+140°F). 
Be aware that temperatures on a vehicle’s dashboard can 
exceed 80°C (+176°F), resulting in permanent damage to 
the transceiver if left there for extended periods. 
AVOID placing the transceiver in excessively dusty environments 
or in direct sunlight. 
AVOID placing the transceiver against walls or putting 
anything on top of the transceiver. This will obstruct heat 
dissipation. 
Place unit in a secure place to avoid inadvertent use by 
children. 
During mobile operation, DO NOT operate the transceiver 
without running the vehicle’s engine. When the transceiver’s 
power is ON and your vehicle’s engine is OFF, 
the vehicle’s battery will soon become exhausted. 
Make sure the transceiver power is OFF before starting 
the vehicle. This will avoid possible damage to the transceiver 
by ignition voltage spikes. 
During maritime mobile operation, keep the transceiver 
and microphone as far away as possible from the magnetic 
navigation compass to prevent erroneous indications. 
BE CAREFUL! The heatsink will become hot when operating 
the transceiver continuously for long periods. 
BE CAREFUL! If a linear amplifier is connected, set the 
transceiver’s RF output power to less than the linear amplifier’s 
maximum input level, otherwise, the linear ampli- 
fier will be damaged. 
Use Icom microphones only (supplied or optional). Other 
manufacturer’s microphones have different pin assignments, 
and connection to the IC-746PRO may damage 
the transceiver.
FOREWORD ........................................ i 
IMPORTANT ........................................ i 
EXPLICIT DEFINITIONS ..................... i 
PRECAUTIONS ................................... i 
TABLE OF CONTENTS ...................... ii 
QUICK REFERENCE GUIDE ........ I.X 
 Installation ....................................... I 
 Operation ....................................... III 
 Your first contact ........................... IV 
 Ready to call CQ? ......................... IX 
1 PANEL DESCRIPTION ........... 1.12 
 Front panel ..................................... 1 
 Rear panel ...................................... 7 
 LCD display .................................... 9 
 Multi function switches .................. 11 
 Microphone (HM-36) .................... 12 
2 INSTALLATION AND 
CONNECTIONS ................... 13.17 
 Unpacking .................................... 13 
 Selecting a location ...................... 13 
 Grounding ..................................... 13 
 Antenna connection ...................... 13 
 Required connections ................... 14 
 Advanced connections ................. 15 
 Power supply connections ............ 16 
 Linear amplifier connections ......... 17 
 External antenna tuner 
connections .................................. 17 
3 BASIC OPERATION ............. 18.25 
 When first applying power 
(CPU resetting) ............................. 18 
 Initial settings ................................ 18 
 Selecting an operating band ........ 19 
 Selecting VFO/memory mode ...... 20 
 VFO operation .............................. 20 
 Frequency setting ......................... 21 
 Operating mode selection ............ 23 
 Volume setting .............................. 23 
 Squelch and receive (RF) 
sensitivity ...................................... 24 
 Basic transmit operation ............... 25 
4 RECEIVE AND TRANSMIT .. 26.46 
 Operating SSB ............................. 26 
 Operating CW ............................... 27 
SUPPLIED ACCESSORIES 
The transceiver comes with the following accessories. 
q DC power cable (OPC-025D) ............................ 1 
w Hand microphone (HM-36) ................................ 1 
e Spare fuses (FGB 30 A) .................................... 2 
r Spare fuse (FGB 5 A) ........................................ 1 
t CW keyer plug (AP-330) .................................... 1 
Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, 
Germany, France, Spain, Russia and/or other countries. 
Qty. 
TABLE OF CONTENTS 
 Electronic keyer functions ............ 29 
 Operating RTTY (FSK) ................. 35 
 RTTY functions ............................. 36 
 Operating AM ............................... 40 
 Operating FM ............................... 41 
 Repeater operation ....................... 44 
5 FUNCTIONS FOR RECEIVE 
........................................... 47.54 
 Simple band scope ....................... 47 
 Preamp/Attenuator ....................... 48 
 RIT function .................................. 48 
 AGC function ................................ 49 
 IF filter selection ........................... 50 
 IF (DSP) filter shape ..................... 51 
 Noise blanker ............................... 51 
 Meter peak hold function .............. 51 
 Twin PBT operation ...................... 52 
 Noise reduction ............................ 53 
 Notch function .............................. 53 
 Dial lock function .......................... 53 
 Voice squelch control function ...... 54 
6 FUNCTIONS FOR TRANSMIT 
........................................... 55.61 
 VOX function ................................ 55 
 Break-in function .......................... 56 
 ¡ÓTX function ................................ 57 
 Monitor function ............................ 57 
 Speech compressor ..................... 58 
 Transmit filter width selection ....... 58 
 Split frequency operation .............. 59 
 Quick split function ....................... 60 
 Measuring SWR ........................... 61 
7 MEMORY OPERATION ........ 62.68 
 Memory channels ......................... 62 
 Memory channel selection ............ 62 
 Programming a memory ............... 63 
 Memory clearing ........................... 63 
 Selecting the call channel ............. 64 
 Programming the call channel ...... 64 
 Frequency transferring ................. 65 
 Programming scan edges ............ 66 
 Assigning memory names ............ 67 
 Memo pads ................................... 68 
8 SCANS ................................. 69.74 
 Scan types .................................... 69 
 Preparation ................................... 69 
q w 
e r t
 Voice squelch control function ...... 70 
 Scan set mode ............................. 70 
 Programmed scan/Fine programmed 
scan .............................................. 71 
 Memory scan operation ................ 72 
 Select memory scan ..................... 72 
 ¡ÓF scan operation and Fine ¡ÓF scan 
...................................................... 73 
 Tone scan/DTCS code scan 
operation ...................................... 74 
9 ANTENNA TUNER OPERATION 
............................................ 75.77 
 Antenna connection and selection 75 
 Antenna tuner operation ............... 76 
 Optional external tuner operation . 77 
10 DATA COMMUNICATION ..... 78.80 
 Connections ................................. 78 
 Packet (AFSK) operation .............. 79 
 Adjusting the TNC output level ..... 80 
 Data transmission speed .............. 80 
11 SET MODE ............................ 81.89 
 General set mode ......................... 81 
 Tone control set mode .................. 89 
12 OPTION INSTALLATION ..... 90.91 
 Opening the transceiver¡¯s case .... 90 
 UT-102 VOICE SYNTHESIZER UNIT ... 90 
 CR-338 HIGH STABILITY CRYSTAL UNIT 
..................................................... 91 
13 MAINTENANCE .................... 92.94 
 Trouble shooting ........................... 92 
 Fuse replacement ......................... 93 
 Tuning dial brake adjustment ....... 93 
 Resetting the CPU ........................ 94 
 Frequency calibration (approximate) 
..................................................... 94 
14 CONTROL COMMAND ......... 95.99 
 Remote jack (CI-V) information .... 95 
15 SPECIFICATIONS...................... 100 
16 OPTIONS.................................... 101 
ii
QUICK REFERENCE GUIDE 
 Installation 
1. Install a ground system for DC noise suppression 
and RFI suppression 
2. Install your DC power supply 
3. Install lightning protection. This will help protect 
more than your gear. 
1. Grounding your Shack 
Although your radio will operate by connecting the DC 
power supply and antenna, it is necessary to have a 
good ground system in your shack. A ground connection 
is the electrical contact between the common point 
of an electrical or electronic system and the earth. 
A good earth ground is necessary to prevent electrical 
shock, eliminate problems from RFI and DC noise. 
With more electronic devices being used today, it is 
also important to reduce RFI and EMI. Although you 
may not see interference in your shack, without a 
grounding system, your neighbors may experience interference. 
Even though many of these devices are 
Part 15, where they must accept interference from 
their surrounding environment, it is best to eliminate 
as much of the possible interference from your shack. 
If you do not have a grounding system for your shack, 
depending on the location of your shack, basement or 
ground floor, a good ground system can be as simple 
as a couple of ground rods driven 6 to 8 feet into the 
soil. When installing your IC-746PRO to your grounding 
system, the shortest most direct connection is recommended. 
NOTE: There are many publications covering 
proper grounding techniques. Check with your local 
dealer for more information and recommendations. 
2. Installing your DC Power Supply 
The DC power supply is a device used to convert 
110/220 V AC, also know as Household current, to a 
steady source of 13.8 V DC. 
The perfect match to your IC-746PRO is the PS-125. 
This compact switching power supply is the matching 
power supply for your IC-746PRO with a current rating 
of 25 A continuous duty. This plug and play unit 
plugs into the DC jack located on the rear of the radio. 
Transceiver PS-125 DC power 
socket 
DC power cable 
Connect to an AC outlet using the supplied AC cable. 
I 
4. Install and connect an antenna system for the appropriate 
bands of operation 
5. Connect other peripheral equipment. This includes 
microphones, headsets, TNC, amplifiers and any 
other equipment necessary to make your shack 
complete. 
RWARNING!: NEVER ground station equipment 
or antennas to house gas lines. NEVER attach 
ground lines to plastic (pvc) pipe. 
D Some Symptoms if inadequate grounding 
a. Poor DC Ground 
60 Hz hum on the audio either Rx or Tx without the 
antenna connected. 
If you feel a tingling sensation when you touch a 
metal surface. Surfaces such as the cover of your 
radio or power supply. 
b. Poor RF Ground 
While transmitting and you feel a tingling sensation 
when you touch a metal surface. Surfaces such as 
the cover of your radio or power supply. 
While transmitting, you experience interference to 
other electronic devices, such as the telephone, 
television or stereo audio systems. 
• If you are not using the PS-125: 
Connect the supplied DC power cable (OPC-025D) to 
the appropriate color coded terminals, then insert the 
DC connector into the DC jack located on the rear of 
the radio. 
Transceiver AC 
outlet 
to DC power 
socket 
A DC power 
supply* 
Red Black 
Supplied 
AC cable DC power cable *13.8 V; at least 23 A 
continuous 
+ _ 
30 A fuses 
NOTE: Although the power supply current requirement 
is quite low during receiving, this not the case 
when you transmit. With many electrical devices in 
the shack, it is very important to verify the electrical 
circuit is not overloaded.
3. Installing lightning protection 
Although you may not live in an area with high occurrence 
for lightning storms, it is always wise to take 
precautions for lightning or static discharges. Proper 
lightning protection not only offers protection to the 
ham gear, but the shack and most importantly the operator. 
4. Installing your antenna system 
Whether your IC-746PRO is your first radio or one of 
many, one of your key elements in a great shack is 
the antenna system. There are three connections on 
the back of your IC-746PRO, two for HF and 6 m and 
one for 2 m. If you are using one antenna for HF and 
6 m, for simplicity, connect the antenna coax to ANT1. 
ANTENNA 1, 2 
[Example]: ANT1 for 1.8.18 MHz bands 
ANT2 for 21.50 MHz bands 
144 MHz ANTENNA 
Connect a VHF (60.144 MHz) 
antenna; impedance: 50 §Ù. 
Your IC-746PRO is equipped with an internal antenna 
tuner (ATU) for operation on 160.6 m. This ATU is designed 
to work with an unbalanced 50 §Ù feedline. The 
purpose of the internal antenna tuner is to match the 
impedance of your antenna system to as close to a 
50 §Ù load as possible. This ATU will not operate with 
a long wire or ladder line (450 §Ù or other balanced 
feedlines). An external ATU such as the AH-4 would 
be necessary for this kind of operation. 
QUICK REFERENCE GUIDE 
NOTE: There are many publications covering 
proper lightning protection, check with your local 
dealer for more information and recommendations. 
30 mm Slide the coupling ring 
down. Strip the cable 
jacket and soft solder. 
Soft 
solder 
1.2 mm 
Strip the cable as 
shown at left. Soft solder 
the center conductor. 
solder solder 
Slide the connector 
body on and solder it. 
Screw the coupling 
ring onto the 
connector body. 
Antenna SWR 
Each antenna is tuned for a specified frequency 
range and SWR may be increased out-of-range. 
When the SWR is higher than approx. 2.0:1, the 
transceiver¡¯s power drops to protect the final transistors. 
In this case, an antenna tuner is useful to 
match the transceiver and antenna. Low SWR allows 
full power for transmitting even when using the 
antenna tuner. The IC-746PRO has an SWR meter 
to monitor the antenna SWR continuously. 
PL-259 CONNECTOR INSTALLATION EXAMPLE 
q 
10 mm (soft solder) Coupling ring 
w 10 mm 
e
r 
30 mm . 9.8 in 10 mm . 3.8 in 1.2 mm . 1.16 in 
RWARNING: Although a mag mount antenna 
works great on a vehicle, DO NOT use the IC- 
746PRO with this type of antenna. 
CAUTION: Although your IC-746PRO has protection 
to drop down power with a high SWR, this 
does not completely protect the transceiver from 
transmission without an antenna. Make sure you 
have an antenna connected whenever you transmit 
with your radio. 
NOTE: There are many publications covering 
proper antennas and their installation, check with 
your local dealer for more information and recommendations. 
II
QUICK REFERENCE GUIDE 
If you do not see the particular item you are wanting 
to connect, refer to the Advance Connections section 
starting on page 15. 
MICROPHONES 
SM-20 HM-36 
b. Straight Key: Use a 6.35(d) mm (1.4��) mono plug 
and connect key to the back of the radio. 
c. External Keyer: Use a 6.35(d) mm (1.4��) mono 
plug and connect to the back of the radio. 
d. Computer Keying: Use a 6.35(d) mm (1.4��) mono 
plug and connect to the back of the radio. 
STRAIGHT KEY 
(+) 
5. Connect other peripheral equipment 
Everyone has his or her favorite ad-on gear; now is 
the time to connect this gear! We will cover the basic 
devices that can be connected to your IC-746PRO. 
(dot) 
(com) 
(dash) 
(_) 
 Operation 
1. Voice 
Microphones: Connect the microphone to the eightpin 
connector on the front of the radio. 
2. CW 
CW Key: There are several types of keys or keyers 
that can be used with your IC-746PRO. 
a. Iambic Key paddle: Use a 6.35(d) mm (1.4��) stereo 
plug and connect to the [ELEC-KEY] jack located 
on the front of the radio. 
CW KEY 
A straight key can be used when the internal 
electronic keyer is turned OFF in keyer set 
mode. (p. 34) 
NOTE: You will need to select the type of keyer you 
are using in the Keyer Set mode. There are many 
advanced CW functions in this set mode. Until you 
have a full understanding of these functions 
change only the items necessary. 
III
3. Other convenient items 
Headphones: 
A 6.35(d) mm (1.4��) mono jack for operation without 
using the internal or external speakers. Perfect for operation 
without disturbing others in the room. 
HEADPHONES 
 Your first contact 
Now you should have your IC-746PRO installed in 
your shack, and like a kid on his birthday, you are 
probably excited to get on the air. We would like to 
take you through a few basic operation steps to make 
your first �gOn The Air�h an enjoyable experience. 
D Getting started 
1. Before powering up your radio, you may want to 
make sure the following controls are set in the following 
positions: 
. [AF] : Commonly referred to as the volume: 
fully counter clockwise. 
.[NR] : The noise reduction control: fully 
counter clockwise. 
. [MIC GAIN] : The mic gain: fully counter clockwise. 
.[RF/SQL] : The control for the RF Gain and 
Squelch circuits: 12 o�fclock. 
.[CW PITCH] : The control for the CW pitch: 
12 o�fclock. 
.[KEY SPEED] : Internal CW Keyer Speed: fully 
counter clockwise 
.[NOTCH] : Control for the manual notch: 
12 o�fclock 
QUICK REFERENCE GUIDE 
External Speaker: 
A 3.5(d) mm (1.8��) mono jack for operation with an external 
speaker. (Input impedance: 8 ./Max. input 
power: 5 W) 
EXTERNAL SPEAKER 
SP-21 (optional) 
2. Resetting the CPU: Although you have purchased 
a brand new radio, some settings may be changed 
from the factory defaults during the QC process. So 
your radio can start from Factory Defaults resetting 
the CPU is necessary. 
[F-INP] [M-CL] [POWER] 
IV
QUICK REFERENCE GUIDE 
D Just listening 
1. Select the desired band 
On your IC-746PRO, an easy way of changing bands 
is by using the keypad located just above the tuning 
knob on the right hand side of the display. You will notice 
each switch has two sets of numbers; one set of 
numbers represents the band selection. 
2. Tune to the desired frequency 
Directly below the keypad is the tuning knob. This will 
allow you to dial in the frequency you want to operate. 
You will notice the tuning speed [TS] is 10 Hz resolution. 
Page 22 will instruct you on how to set the 
tuning speed [TS] for 1 Hz resolution. 
3. Verify proper antenna has been selected. 
You IC-746PRO has three antenna connectors. Two 
for HF and 6 m and a one for 2 m. The selection for 
2 m is automatic, where the HF and 6 m is user selectable 
for either one of the antenna jacks. For first 
time use, the antenna selector should show “ ” on 
the display of your radio. Verify the antenna selected 
on the display is the antenna port your antenna is 
connected to. 
4. Adjust audio output 
Adjust this control to a comfortable audio level. 
V 
•Say you want to go to 20 meters or 14 MHz; you 
would push the [14 5]. This will immediately change 
the displayed operating frequency to the 20-meter 
band. By pushing [14 5] again, frequency pre-sets 
in the triple band stacking registers frequency can be 
displayed. For more details on this system refer to 
p. 19. 
3.5 2 1.8 1 7 3 
10 4 18 6 14 5 
21 7 24 8 28 9 
GENE 144 ENT 50 0 
NOTE: Although you can directly enter the frequency 
with the keypad, using the Band Stacking 
Register and the tuning knob is the most popular 
method of hoping around the bands. For more information 
regarding the direct frequency entry 
method, refer to p. 22. 
Either “1” or “2” appears. 
*No indicator appears during 
144 MHz operation. 
RF/SQL AF 
Increases Decreases 
No audio output Max. audio output
D What are you hearing? 
Stop and focus on what you are hearing. Do you hear 
a lot of noise? Is the signal intelligible? Are you set up 
for the right mode? How about the filters? 
1. Verify mode 
Although your IC-746PRO will automatically select 
USB or LSB in the HF bands, it will not select any of 
the other modes. You will need to select the proper 
mode whether CW, RTTY, AM or FM. 
2. Reducing interference 
Your IC-746PRO has many features to reduce QRM 
and QRN from the desired signal. 
a. Noise Reduction: The noise reduction system on 
your IC-746PRO is part of the 32-bit DSP. This is 
used to reduce the hiss and QRM levels. To activate, 
push the [NR] switch located just to the right 
of the [PHONES] jack. 
[NR] [NR] 
AGC DUP CMP TBW SCP 
Appears 
b. Adjusting the Noise Reduction: The noise reduction 
is completely variable on how much of the 
DSP Noise Reduction is used [NR] level control located 
just above the [NR] switch. 
QUICK REFERENCE GUIDE 
CW/RTTY SSB AM/FM 
Hint! 
The Triple Band Stacking Register will memorize 
the last three frequencies used in the band, as well 
as the Mode, Filter, Tuner and AGC settings. This 
makes band hoping much easier. 
NOTCH NR 
Decreases Increases 
OFF 
Noise reduction ON 
Noise reduction OFF 
Hint! 
How far you advance the NR control will determine 
how much the noise can be effectively reduced. 
Turning the control too far clockwise may cause 
some distortion to occur on the received signal. The 
NR control should only be turned as far clockwise 
as is necessary. Use this control, along with RF 
gain, NB (noise blanker, if needed), and IF filters as 
well, to minimize the effects of noise on the target 
signal. 
VI
QUICK REFERENCE GUIDE 
c. Notch: There are two notch systems on your IC- 
746PRO. 
•Automatic: The automatic notch will track up to three 
heterodynes. This is helpful for eliminating annoying 
transmitter “tune up” tones on any band, and to minimize 
continuous tone “heterodynes” encountered on 
the 40 meter phone bands at night, for example. 
Once selected an icon will appear “A NOTCH” on 
the display. 
Hint! 
The Automatic Notch will not operate in the SSB 
data, CW or RTTY modes. 
•Manual: The Manual notch provides 70 dB of attenuation 
to pin point an interfering signal. The 12 o’- 
clock position is on the operating frequency, turning 
the Notch knob clockwise moves the notch up the 
band and counter clockwise will move the notch 
down the band. Once selected an icon “NOTCH” will 
appear on the display. 
NOTCH NR 
High frequency Low frequency 
d. Filters: Your IC-746PRO has an incredible IF DSP 
based filter network with over 100 settings. 
• Dial in your filters: By pushing [FILTER] for 1 sec., 
you enter the filter set mode. This is where you are 
able set the three filter presets. Across the bottom of 
the display you will see the “BW” icon. The switch directly 
below, along with the tuning dial, will be used 
to select the changes you will make. 
[FILTER] 
AGC DUP CMP TBW SCP 
The selected filter width is indicated 
for approx. 1 sec. when [FILTER] is 
pushed. Filter selection 
VII 
[A/NOTCH] [NOTCH] 
BW 
Shows the selected filter and passband width. 
• Indication while setting 
AGC DUP CMP TBW SCP 
Notch function indicators 
NOTE: Your IC-746PRO is equipped with multiple 
AGC circuits. This allows the DSP to filter out interfering 
signals and QRM, while also taking this interference 
out of the AGC. Bottom line, this will either 
eliminate or greatly reduce the pumping of the 
AGC from the interfering signal. 
• Filter set mode indication 
Reverses Appears 
BW 
While pushing [F1 BW], rotate the tuning dial to set 
passband width.
d. Filters:— continued 
•On the fly adjustment: Once the adjustments have 
been made in the filter set mode, you can make on 
the fly changes by using the Twin Pass Band Tuning, 
Twin PBT. You will be able to see the effects of the 
Twin PBT on the upper left hand side of the screen. 
One of “1,” “2” or “3” is 
displayed for selected filter 
number indications. 
NOTE: The Twin PBT filters shift the two IF DSP 
filters (See Diagrams below and right). This feature 
allows both an IF shift as well as a narrowing of the 
Pass Band. Although you can narrow the pass 
band by shifting the two filters, this does not narrow 
both filters, thus the filter shape is not narrowed. 
You may hear some signal artifacts pass 
through this filter adjustment. 
Center 
IF center frequency 
Passband 
pass band 
desired signal inteference interference 
PBT operation example 
BW 
Shows the selected filter and passband width. 
• Indication while PBT setting 
AGC DUP CMP TBW SCP 
Passband width and shifting value are 
indicated while [TWIN PBT] is operated. 
• Filter set mode indication 
Appears when PBT is used. 
IF shift 
IF center freq. interference 
BW 
Appears when passband is shifted. 
*By pushing [PBTC] for 1 sec., the shifted value returns 
to the default setting, and the “dot” disappears. 
Passband 
desired signal 
QUICK REFERENCE GUIDE 
[TWIN PBT] control 
[PBTC] 
VIII
QUICK REFERENCE GUIDE 
3. RX Tone Control: 
Once you have mastered your filter settings, one last 
feature to enable the most intelligible audio is the actual 
audio tone you hear. You can adjust the equalization 
of your received audio ¡¾5dB. 
q Push [MENU] several times, or until M2 is shown 
on the display. 
w Push [F4 TCN] for the Tone Control set mode. 
e Push the appropriate mode switch to adjust SSB, 
AM or FM. 
r Push [F1 ¡Â] or [F2 ¡Ã] to change to the desired 
component. 
1. RX Bass 
This item adjusts the bass level of the receive audio 
tone from .5 dB to +5 dB in 1 dB steps. 
2. RX Treble 
This item adjusts the treble level of the receive audio 
tone from .5 dB to +5 dB in 1 dB steps. 
We hope these pointers have been helpful. Now you 
are ready for the ¡°Ready to call CQ?¡±. 
[NOTCH]: Max. CCW 
HF/VHF TRANSCEIVER 
F 2 F 3 F 4 F 1 
MENU SSB 
CW PITCH RF PWR KEY SPEED P.AMP/ATT 
 Ready to call CQ? 
[NR]: Max. CCW 
POWER 
TRANSMIT 
[TRANSMIT]: OFF 
PHONES 
ELEC-KEY 
MIC [AF]: Max. CCW 
[RF/SQL]: 12 o¡¯clock 
[MIC GAIN]: Max. CCW 
[RF PWR]: Max. CCW 
i746PRO 
ANT TUNER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
[CW PITCH]: 12 o¡¯clock 
1. Setting up your transmit audio 
The 32-bit DSP in your IC-746PRO is capable of allowing 
you to selects transmit audio for phone modes. 
2. Mic Gain 
The microphone gain is used for proper transmit 
audio level for full output power. 
IX 
[F1 ¡Â] [F2 ¡Ã] [F4 TCN] 
Tuning dial [MENU] 
O 
RX Bass SSB 
3 
O 
F 5 
FILTER CW/RTTY AM/FM 
VOX/BK-IN MONITOR NB 
RX Treble SSB 
4 
TWIN PBT 
3.5 2 1.8 1 7 3 
F-INP 
10 4 18 6 14 5 
21 7 24 8 28 9 SPLIT 
MW PBTC 
GENE 144 ENT 50 0 A/B 
V/M M-CL 
M-CH TS MP-W MP-R 
TX RX 
LOCK XFC 
RIT CLEAR ¡ÓTX 
RIT/¡ÓTX 
CALL LOCK/ 
SPCH 
[KEY SPEED]: Max. CCW
3. DSP TX Audio Pass Band 
The capability of changing the pass band of your 
transmit audio, is at your finger tips. Regardless of the 
condition of the speech compressor, you can adjust it 
by selecting the [F4 TBW]. 
You will find this located in the M1 menu. By pushing 
[F4 TBW] for 1 sec. you can select the TX audio band 
pass. 
There are three levels of audio passband width available 
(Wide, Mid, and Nar). 
TX Audio Passband widths 
: 2.8 kHz 
: 2.4 kHz 
Wide 
Mid 
: 2.2 kHz Nar 
; Great Full Audio 
; Great for operators with 
deep full voices 
; Great for breaking through 
pile ups 
4. Microphone Equalizer 
Although these bandwidths are fixed, the Microphone 
Tone Control will give you more audio control for your 
voice operation on SSB, AM, and FM modes. Your IC- 
746PRO is equipped with a very powerful equalizer 
system with 121 possible combinations. This is 
achieved by using the separate bass and treble adjustments. 
The default for both the Base and Treble 
is at 0 dB. 
Entering Microphone Tone Control set mode: 
q Push [MENU] several times, or until M2 is shown 
on the display. 
w Push [F4 TCN] for the Tone Control set mode. 
e Push the appropriate mode switch to adjust SSB, 
AM, or FM. 
r Push [F1 ¡Ü] or [F2 ¡İ] to change to the desired 
component. 
1. TX Bass 
This item adjusts the bass level of the transmit audio 
tone from ¨C5 dB to +5 dB in 1 dB steps. 
2. TX Treble 
This item adjusts the treble level of the transmit audio 
tone from ¨C5 dB to +5 dB in 1 dB steps. 
Verify you have selected a clear frequency 
and call out your CQ! 
QUICK REFERENCE GUIDE 
AGC DUP CMP TBW SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] 
TX BW=WIDE 
AGC DUP CMP TBW SCP 
F 5 F 2 F 3 F 4 F 1 
The selected transmit filter width 
is displayed for approx. 1 sec. 
Push [F4] for 1 sec. to select the transmit filter width. 
[F1 ¡Ü] [F2 ¡İ] [F4 TCN] 
Tuning dial [MENU] 
Hint! 
Voice patterns and audio characteristics vary with 
each operator, therefore the [MIC GAIN], DSP TX 
Audio Pass Band and Microphone Tone Control 
settings will be different for each operator. Actual on 
air experimenting is necessary to get just the right 
sound. Listen to your transmit audio with headphones 
and the monitor function turned ON. It¡¯s 
also best to test and adjust your audio on the air, 
while someone who knows what your real voice 
sounds like listens, and provides and opinion on 
your audio quality. 
TX Bass SSB 
1 O 
TX Treble SSB 
2 O 
X
w
e
r 
1 PANEL DESCRIPTION 
 Front panel 
!6 
POWER q 
!7 
TRANSMIT 
PHONES 
ELEC-KEY 
MIC 
F 1 
MENU 
KEY SPEED P.AMP/ATT 
!5 !4 !3 !2 
CW PITCH RF PWR 
i746PRO 
ANT TUNER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
y uio !0 
.Push momentarily to turn power ON. 
.Turn the optional DC power supply ON in advance. 
.Push for 1 sec. to turn power OFF. 
w TRANSMIT SWITCH [TRANSMIT] 
Selects transmitting or receiving. 
. The [TX] indicator lights red while transmitting and the 
[RX] indicator lights green when the squelch is open. 
e HEADPHONE JACK [PHONES] 
. Output power: 5 mW with an 8 . load. 
. When headphones are connected, the internal speaker 
or connected external speaker does not function. 
r ELECTRONIC KEYER JACK [ELEC-KEY] (p. 14) 
Accepts a paddle to activate the internal electronic 
keyer for CW operation. 
. Selection between the internal electronic keyer, bug-key 
and straight key operation can be made in keyer set 
.A straight key jack is separately available on the rear 
. Keyer polarity (dot and dash) can be reversed in keyer 
.4-channel memory keyer is available for your conve- 
(dot) 
(com) 
(dash) 
!1 
t 
q POWER SWITCH [POWER] 
Accepts headphones. 
mode. (p. 34) 
panel. See [KEY] on p. 7. 
set mode. (p. 34) 
nience. (p. 30) 
1 
HF/VHF TRANSCEIVER 
F 2 F 3 F 4 
SSB CW/RTTY AM/FM 
VOX/BK-IN NB 
t MICROPHONE CONNECTOR [MIC] 
Accepts the supplied or an optional microphone. 
. See p. 101 for appropriate microphones. 
. See p. 12 for microphone connector information. 
y RF GAIN CONTROL/SQUELCH CONTROL 
[RF/SQL] (outer control) 
Adjusts the RF gain and squelch threshold level. 
The squelch removes noise output from the speaker 
(closed condition) when no signal is received. 
. The squelch is particularly effective for FM. It is also 
available for other modes. 
. 12 to 1 o�fclock position is recommended for any setting 
of the [RF/SQL] control. 
. The control can be set as �eAuto�f (RF gain control in SSB, 
CW and RTTY; squelch control in AM and FM) or 
squelch control (RF gain is fixed at maximum) in set 
mode as follows. (p. 82) 
MODE 
RF GAIN 
SSB, CW 
RTTY 
AM, FM 
. When setting as RF gain/squelch control 
Squelch is 
open. 
RF gain 
adjustable 
range 
3.5 2 1.8 1 7 3 
F-INP 
10 4 18 6 14 5 
21 7 24 8 28 9 SPLIT 
GENE 144 ENT 50 0 A/B 
TS MP-W MP-R 
TX RX 
LOCK XFC 
F 5 
FILTER 
CALL LOCK/ 
SPCH MONITOR
SET MODE SETTING 
SQL AUTO RF GAIN + SQL 
SQL RF GAIN + SQL 
SQL SQL RF GAIN + SQL 
Noise squelch (FM mode) 
Recommended level 
Maximum 
RF gain 
S-meter 
squelch
PANEL DESCRIPTION 1 
•When functioning as RF gain control !0 CW PITCH CONTROL [CW PITCH] (p. 28) 
(Squelch is fixed open; SSB, CW, RTTY only) Shifts the received CW audio pitch and monitored 
CW audio pitch without changing the operating frequency. 
Maximum 
RF gain • The pitch can be changed from 300 to 900 Hz in approx. 
25 Hz steps. Adjustable 
range Increases Decreases 
CW PITCH 
Minimum RF gain 
!1 ELECTRONIC CW KEYER SPEED CONTROL 
[KEY SPEED] (p. 28) •When functioning as squelch control 
(RF gain is fixed at maximum.) Adjusts the internal electronic CW keyer’s speed. 
• 6 wpm (min.) to 60 wpm (max.) can be set. 
Noise squelch (FM mode) 
Fast Slow Noise squelch 
threshold 
(FM mode) KEY SPEED 
S-meter squelch 
threshold 
!2 AUTO NOTCH/MANUAL NOTCH SWITCH 
[A/NOTCH] (p. 53) 
S-meter 
squelch 
Squelch is 
open. 
Toggles the notch function between manual and automatic 
when pushed. 
Deep Shallow • “NOTCH” appears when manual; “A NOTCH” appears 
when automatic notch is selected. 
!3 NOTCH CONTROL [NOTCH] (outer control; p. 53) 
While rotating the RF gain control, noise may be 
heard. This comes from the DSP unit and does not 
indicate an equipment malfunction. Adjusts the notch filter frequency to remove an interfering 
signal. 
u MIC GAIN CONTROL [MIC GAIN] NOTCH NR 
Adjusts microphone input gain. 
• The transmit audio tone in SSB, AM and FM modes can High frequency Low frequency 
be adjusted in tone control set mode. (p. 89) 
.How to set the microphone gain. 
!4 ANTENNA SELECTOR SWITCH [ANT] (p. 75) 
Switches the antenna connector selection between 
ANT1 and ANT2 when pushed. 
Set the [MIC] control so that the ALC meter sometimes 
swings during normal voice transmission in SSB mode. 
Make sure that voice peak readings do not exceed the ALC 
range brackets on the meter. 
!5 NOISE REDUCTION LEVEL CONTROL [NR] 
Recommended level for 
an Icom microphone (inner control; p. 53) 
Adjusts the noise reduction level when the noise reduction 
is in use. Set for maximum readability. Increases Decreases 
NOTCH NR 
MIC GAIN 
Decreases Increases 
i AF CONTROL [AF] (inner control) 
Varies the audio output level from the speaker. OFF 
RF/SQL AF 
Increases Decreases !6 ANTENNA TUNER SWITCH [TUNER] (pgs. 76, 77) 
.Turns the antenna tuner ON and OFF (bypass) 
when pushed momentarily. 
No audio output Max. audio output 
.Starts to tune the antenna manually when 
pushed for 1 sec. 
o RF POWER CONTROL [RF PWR] 
Continuously varies the RF output power from min- 
•When the tuner cannot tune the antenna, the tuning 
circuit is bypassed automatically after 20 sec. 
imum (less than 5 W*) to maximum (100 W*). 
* AM mode: less than 5 W to 40 W !7 NOISE REDUCTION SWITCH [NR] (p. 53) 
Increases Decreases 
Switches the noise reduction ON and OFF. 
• “NR” appears while the noise reduction is activated. 
RF PWR 
2
1 PANEL DESCRIPTION 
!8 MULTI-FUNCTION SWITCHES [F1].[F5] 
.Toggles between menu 1 (M1) and menu 2 (M2). 
@3 
 Front panel (continued) 
T 
Y 
RF PWR
!8 
!9 MENU SWITCH [MENU] 
@0 MODE SWITCHES 
is installed. (p. 90) 
i746PRO 
ANT TUNER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
SSB 
CW/RTTY 
AM/FM 
HF/VHF TRANSCEIVER 
F 2 F 3 F 4 F 1 
MENU SSB CW/RTTY 
CW PITCH KEY SPEED P.AMP/ATT NB 
@2 !9 @0 @1 
.Push to select the function indicated in the LCD 
display above these switches. (p. 11) 
.Functions vary depending on the operating mode. 
.Push to input a character for memory keyer programming 
or memory name. (pgs. 31, 67) 
Push to change the set of functions assigned to the 
multi-function switches. 
Selects the desired mode. (p. 23) 
. Announces the selected mode when an optional UT-102 
.Selects USB and LSB mode alternately. 
.Selects SSB data mode (USB-D, LSB-D) 
when pushed for 1 sec. in SSB mode. 
.Selects CW and RTTY mode alternately. 
.Switches CW and CW-R (CW reverse) 
mode when pushed for 1 sec. in CW 
mode. 
.Switches RTTY and RTTY-R (RTTY reverse) 
mode when pushed for 1 sec. in 
RTTY mode. 
.Selects AM and FM mode alternately. 
.Selects AM/FM data mode (AM-D, FM-D) 
when pushed for 1 sec. in AM/FM mode. 
@4 
3 
F 5 
FILTER AM/FM 
VOX/BK-IN MONITOR 
@5 @6 
TWIN PBT 
3.5 2 1.8 1 7 3 
F-INP 
10 4 18 6 14 5 
21 7 24 8 28 9 SPLIT 
MW PBTC 
GENE 144 ENT 50 0 A/B 
V/M M-CL 
M-CH TS MP-W MP-R 
#7 
#6 
#5 
#4 
TX RX 
LOCK XFC #3 
RIT CLEAR ¡ÓTX 
RIT/¡ÓTX 
#2 
#1 
#0 
CALL LOCK/ 
SPCH 
@7 
ON and OFF. 
@9 
@1 PREAMP/ATTENUATOR SWITCH [P.AMP/ATT] 
(p. 48) 
.Push momentarily to toggle between preamp-1 
and preamp-2. 
. ¡°P.AMP1¡± activates for HF all bands. 
. ¡°P.AMP2¡± activates high-gain preamp for 24 MHz 
band and above. 
.Push for 1 sec. to toggle the attenuator function 
The preamp amplifies received signals in the front end circuit 
to improve the S/N ratio and sensitivity. Select ¡°P.AMP1¡± 
or ¡°P.AMP2¡± when receiving weak signals. 
The attenuator prevents a desired signal from distorting 
when very strong signals are near the desired frequency, or 
when very strong electric fields, such as from a broadcasting 
station, are near your location. 
@2 NOISE BLANKER SWITCH [NB] (p. 51) 
.Switches the noise blanker ON and OFF when 
pushed. The noise blanker reduces pulse-type 
noise such as that generated by automobile ignition 
systems. This function cannot be used for 
FM, or non-pulse-type noise. 
. ¡°NB¡± appears while the noise blanker is activated. 
.Enters the noise blanker level set mode when 
@8 
.What is the preamp? 
.What is the attenuator? 
pushed for 1 sec.
@3 VOX/BREAK-IN SWITCH [VOX/BK-IN] 
.In SSB, AM and FM modes, push momentarily to 
turn the VOX function ON and OFF (p. 55); push 
for 1 sec. to enter VOX set mode (p. 55). 
.In CW mode, push momentarily to turn the semi 
break-in, full break-in or break-in OFF (p. 56); 
push for 1 sec. to enter break-in set mode (p. 56). 
.What is the VOX function? 
The VOX function (voice operated transmission) starts transmission 
without pushing the transmit switch or PTT switch 
when you speak into the microphone; then, automatically returns 
to receive when you stop speaking. 
.What is the break-in function? 
Full break-in (QSK) activates the receiver between transmitted 
dots and dashes. This is useful when operating in nets, 
or during DX pileups and during contests, when �gfast exchanges�h 
are common. 
@4 MONITOR SWITCH [MONITOR] (p. 57) 
.Monitors your transmitted signal. 
.Enters monitor set mode when pushed for 1 sec. 
@5 FILTER SWITCH [FILTER] (p. 50) 
.Selects one of 3 IF filter settings. 
.Enters the filter set mode when pushed for 1 sec. 
@6 CALL SWITCH [CALL] (p. 64) 
Selects the call channel when pushed momentarily. 
@7 TUNING DIAL (p. 21) 
Changes the displayed frequency, selects set mode 
items, etc. 
@8 LOCK/SPEECH SWITCH [LOCK/SPCH] 
.Push momentarily to toggle the dial lock function 
ON and OFF. (p. 53) 
.Pushing for 1 sec. announces the selected readout 
frequency and S-meter indication when an 
optional UT-102 is installed. (p. 90) 
@9 RIT/�İTX CONTROL [RIT/�İTX] (pgs. 48, 57) 
Shifts the receive and/or transmit frequency without 
changing the transmit and/or receive frequency 
while the RIT and/or �İTX functions are ON. 
. Rotate the control clockwise to increase the frequency, 
or rotate the control counterclockwise to decrease the 
frequency. 
. The shift frequency range is �}9.99 kHz in 10 Hz steps. 
RIT/�İTX 
High shift Low shift 
PANEL DESCRIPTION 1 
#0 RIT SWITCH [RIT] (p. 48) 
.Turns the RIT function ON and OFF when pushed. 
. Use the [RIT/�İTX] control to vary the RIT frequency. 
.Adds the RIT shift frequency to the operating frequency 
when pushed for 1 sec. 
.What is the RIT function? 
The RIT (Receiver Incremental Tuning) shifts the receive frequency 
without shifting the transmit frequency. 
This is useful for fine tuning stations calling you on an off-frequency 
or when you prefer to listen to slightly differentsounding 
voice characteristics, etc. 
#1 CLEAR SWITCH [CLEAR] (pgs. 48, 57) 
Clears the RIT/�İTX shift frequency when pushed 
for 1 sec. 
. Can be cleared instantly when [CLEAR] is pushed if the 
Quick RIT Clear is set to ON (p. 86). 
#2 �İTX SWITCH [�İTX] (p. 57) 
.Turns the �İTX function ON and OFF when 
pushed. 
. Use the [RIT/�İTX] control to vary the �İTX frequency. 
.Adds the �İTX shift frequency to the operating 
frequency when pushed for 1 sec. 
.What is the �İTX function? 
The �İTX shifts the transmit frequency without shifting the receive 
frequency. This is useful for simple split frequency operation 
in CW, etc. 
#3 MEMORY CHANNEL SELECTOR [M-CH] (p. 62) 
Select a memory channel. 
. Rotate clockwise to increase the memory channel; rotate 
counterclockwise to decrease the memory channel. 
#4 VFO/MEMORY SWITCH [VFO/MEMO] 
.Switches the selected readout operating mode 
between the VFO mode and memory mode when 
pushed. (pgs. 20, 62) 
.Transfers the memory contents to VFO when 
pushed for 1 sec. (p. 65) 
#5 MEMORY CLEAR SWITCH [M-CL] (p. 63) 
Clears the selected readout memory channel contents 
when pushed for 1 sec. in memory mode. 
. The channel becomes a blank channel. 
. This switch does not function in VFO mode. 
#6 MEMORY WRITE SWITCH [MW] (p. 63) 
Stores the selected readout frequency and operating 
mode into the displayed memory channel when 
pushed for 1 sec. 
.This function is available both in VFO and memory 
modes. 
#7 PBT CLEAR SWITCH [PBTC] (p. 52) 
Clears the PBT settings when pushed for 1 sec. 
4
1 PANEL DESCRIPTION 
 Front panel (continued) 
F 1 
MENU SSB 
CW PITCH RF PWR KEY SPEED P.AMP/ATT 
HF/VHF TRANSCEIVER 
F 2 F 3 F 4 
%2 
CW/RTTY 
NB 
i746PRO 
ANT NER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
#8 TRANSMIT FREQUENCY CHECK SWITCH [XFC] 
(pgs. 45, 48) 
Monitors the transmit frequency when pushed and 
held. 
. While pushing this switch, the transmit frequency can be 
changed with the tuning dial, keypad or memo pad. 
. When the split lock function is turned ON, pushing [XFC] 
cancels the dial lock function. (p. 60) 
#9 MEMO PAD-WRITE SWITCH [MP-W] (p. 68) 
Programs the selected readout frequency and operating 
mode into a memo pad. 
. The 5 most recent entries remain in memo pads. 
. The transmit frequency is programmed when pushed together 
with [XFC]. 
.The memo pad capacity can be expanded from 5 to 10 
in set mode for your convenience. (p. 85) 
$0 TRANSMIT INDICATOR [TX] 
Lights red while transmitting. 
$1 MEMO PAD-READ SWITCH [MP-R] (p. 68) 
Each push calls up a frequency and operating 
mode in a memo pad. The 5 (or 10) most recently 
programmed frequencies and operating modes can 
be recalled, starting from the most recent. 
.The memo pad capacity can be expanded from 5 to 10 
in set mode for your convenience. (p. 85) 
$2 RECEIVE INDICATOR [RX] 
Lights green while receiving a signal and when the 
squelch is open. 
$3 LOCK INDICATOR [LOCK] (p. 53) 
Lights when the dial lock function is activated. 
AM/FM 
VOX/BK-IN 
5 
F 5 
FILTER 
CALL MONITOR 
TWIN PBT 
1.8 1 7 3 
$7 10 4 18 6 
$6 
MW 
%1 
3.5 2 
14 5 
21 7 24 8 28 9 
50 0 GENE 144 ENT $5 M-CL 
M-CH MP-W MP-R $4 
TX 
XFC 
CLEAR �İTX 
RIT/�İTX 
%0 $9 $8 
F-INP 
SPLIT 
PBTC 
A/B 
V/M 
TS 
RX 
LOCK 
RIT 
LOCK/ 
SPCH 
erating mode of the two VFO�fs. 
$3 
$2 
$1 
$0 
#9 
#8 
$4 QUICK TUNING SWITCH [TS] (p. 21) 
.Turns the quick tuning step ON and OFF. 
. While the quick tuning indicator is displayed, the frequency 
can be changed in programmed kHz steps. 
.0.1, 1, 5, 9, 10, 12.5, 20 and 25 kHz quick tuning 
steps are available. 
Quick tuning indicator 
.While the quick tuning step is OFF, turns the 1 Hz 
step ON and OFF when pushed for 1 sec. 
.1 Hz indication appears, and the frequency can be 
changed in 1 Hz steps. 
.While the quick tuning step is ON, enters the 
quick tuning step set mode when pushed for 
1 sec. 
$5 VFO SELECT SWITCH [A/B] (p. 20) 
.Push to toggle between VFO A and VFO B. 
.Push for 1 sec. to equalize the frequency and op-
$6 SPLIT SWITCH [SPLIT] 
.Turns the split function ON and OFF when 
pushed.(p. 59) 
.Turns the quick split function ON, when pushed 
for 1 sec. (p. 60) 
•The offset frequency is shifted from the displayed frequency. 
• The quick split function can be turned OFF using set 
mode. (p. 83) 
.Turns the split function ON and sets the transmit 
frequency after inputting an offset frequency with 
the keypad (±4 MHz in 1 kHz steps; p. 59). 
$7 PASSBAND TUNING CONTROLS [TWIN PBT] 
Adjust the receiver’s “passband width” of the DSP 
filter. (p. 52) 
• Passband width and shift frequency are displayed in the 
multi-function switch indicator. 
• Push [PBTC] for 1 sec. to clear the settings when not in 
use. 
•Variable range is set to half of the IF filter passband 
width. 25 Hz steps and 50 Hz steps are available. 
• These controls function as an IF shift control while in AM 
mode and when the RTTY filter is turned ON. Only the 
inner control may function in this case. 
.What is the PBT control? 
General PBT function electronically narrows the IF passband 
width to reject interference. This transceiver uses the DSP 
circuit for the PBT function. 
TWIN PBT
PBT1 
PBT2
TWIN PBT TWIN PBT TWIN PBT 
+ – 
High cut Center Low cut 
$8 SPLIT INDICATOR (p. 59) 
Lights during split operation. 
$9 FREQUENCY INPUT SWITCH [F-INP] (p. 22) 
Push to toggle keypad input between frequency and 
band. 
• The frequency input indicator lights when frequency 
input is selected for the keypad. 
%0 FREQUENCY INPUT INDICATOR (p. 22) 
Lights when frequency input from the keypad is enabled. 
PANEL DESCRIPTION 1 
%1 KEYPAD 
.Pushing a key selects the operating band. 
•[GENE • ] selects the general coverage band. 
.Pushing the same key 2 or 3 times calls up other 
stacked frequencies and modes in the band. 
(p. 19) 
•Icom’s triple band stacking register memorizes 3 frequencies 
in each band. 
.After pushing [F-INP], enter a keyed frequency. 
Pushing [144 ENT] is necessary at the end. 
(p. 22) 
• e.g. to enter 14.195 MHz, push [F-INP] [1.8 1] [10 4] 
[GENE • ] [1.8 1] [28 9] [14 5] [144 ENT]. 
%2 LCD FUNCTION DISPLAY 
(See pgs. 9, 10 for details.) 
Shows the operating frequency, function switch 
menus, band scope screen, memory name screen, 
set mode settings, etc. 
6
1 PANEL DESCRIPTION
q w e r 
!1 !4 !3 
Rear panel view 
 Rear panel 
!5 
. See p. 8 for connector information. 
. Max. control level: 16 V DC/0.5 A 
!2 
q DC POWER SOCKET [DC 13.8V] (pgs. 14, 16) 
Accepts 13.8 V DC through the supplied DC power 
cable (OPC-025D). 
w ANTENNA CONNECTOR [ANT 144MHz] 
e ANTENNA CONNECTOR 2 [ANT2] 
r ANTENNA CONNECTOR 1 [ANT1] 
(pgs. 14, 15, 17, 75) 
Accepts a 50 §Ù antenna with a PL-259 connector. 
.[ANT 144MHz] for 144 MHz (2 m) band only; [ANT1] and 
[ANT2] for both HF and 50 MHz (6 m) bands antennas. 
When using an optional AH-4 HF/50 MHz AUTOMATIC 
ANTENNA TUNER, connect it to the [ANT1] 
connector. The internal antenna tuner activates 
for [ANT2] and deactivates for [ANT1] when connecting 
the AH-4. 
t DATA SOCKET [DATA] (pgs. 15, 78) 
Connects a TNC (Terminal Node Controller), etc. for 
data communications. 
y EXTERNAL SPEAKER JACK [EXT SP] (pgs. 15, 101) 
Accepts a 4.8 §Ù speaker. 
u CI-V REMOTE CONTROL JACK [REMOTE] (p. 95) 
.Designed for use with a personal computer for remote 
control of the transceiver functions. 
.Used for transceive operation with another Icom 
CI-V transceiver or receiver. 
i SEND CONTROL JACK [SEND] (p. 17) 
Goes to ground while transmitting to control external 
equipment such as a linear amplifier. 
CAUTION: Be sure the linear amplifiers keying circuit 
control voltage is compatible to the IC-746PRO, 
7 
!0 u yt o i 
before connecting to [SEND]. 
o ALC INPUT JACK [ALC] (p. 17) 
Connects to the ALC output jack of a non-Icom linear 
amplifier. 
!0 ACCESSORY SOCKET 2 [ACC(2)] 
!1 ACCESSORY SOCKET 1 [ACC(1)] 
Enables connection of external equipment such as 
a linear amplifier, an automatic antenna selector/ 
tuner, TNC for data communications, etc. 
. See p. 8 for socket information. 
!2 STRAIGHT KEY JACK [KEY] (p. 14) 
Accepts a straight key or external electronic keyer 
with 1.4 inch standard plug. 
. [ELEC-KEY] on the front panel can be used for a straight 
key or external electronic keyer. Deactivate the internal 
electronic keyer in keyer set mode. (p. 34) 
(+) 
(_) 
!3 TUNER CONTROL SOCKET [TUNER] 
(pgs. 15, 77) 
Accepts the control cable from an optional AH-4 
HF/50 MHz AUTOMATIC ANTENNA TUNER. 
If you use an external electronic keyer, make 
sure the voltage retained by the keyer is less 
than 0.4 V when the key is ON. 
!4 CALIBRATION POT [CAL] (p. 94) 
This is used for frequency calibration. 
. The transceiver has been adjusted and calibrated thoroughly 
at the factory. Under normal circumstances, the 
frequency does not need to be re-calibrated. 
!5 GROUND TERMINAL [GND] (pgs. 13, 14) 
Connect this terminal to a ground to prevent electrical 
shocks, TVI, BCI and other problems.
PANEL DESCRIPTION 1 
DESCRIPTION 
DATA IN Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK) 
GND Common ground for DATA IN, DATA OUT and AF OUT. 
PTT P PTT terminal for packet operation. Connect ground to transmit data. 
DATA OUT Data out terminal for 9600 bps operation only. 
AF OUT Data out terminal for 1200 bps operation only. 
DDATA SOCKET 
PIN No. NAME DATA 
1 2 
3 4 
1
2
3
4
5 
5 6 
Rear panel view 6 P SQL 
Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal 
which opens the squelch. 
.To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit transmission 
when receiving signals. 
. Keep audio output at a normal level, otherwise a ¡°P SQL¡± signal will not be output. 
SPECIFICATIONS DESCRIPTION 
RTTY Controls RTTY keying 
: More than 2.4 V 
: Less than 0.6 V 
: Less than 2 mA 
¡°High¡± level 
¡°Low¡± level 
Output current 
GND Connects to ground. Connected in parallel with ACC(2) pin 2. 
Ground level : .0.5 V to 0.8 V 
Output current : Less than 20 mA 
Input current (Tx) : Less than 200 mA 
Connected in parallel with ACC(2) pin 3. 
MOD Modulator input. 
Connects to a modulator. 
: 10 k§Ù 
: Approx. 100 mV rms 
Input impedance 
Input level 
Output impedance : 4.7 k§Ù 
Output level : 100.300 mV rms 
AF detector output. 
AF Fixed, regardless of [AF] position in 
default settings. (see notes below) 
SQL open SQLS Squelch output. 
Goes to ground when squelch opens. SQL closed 
: Less than 0.3 V/5 mA 
: More than 6.0 V/100 ¥ìA 
Output current 13.8 V 13.8 V output when power is ON. : Max. 1 A 
Connected in parallel with ACC(2) pin 7. 
ALC ALC voltage input. 
Control voltage : .4 V to 0 V 
Input impedance : More than 10 k§Ù 
Connected in parallel with ACC(2) pin 5. 
SPECIFICATIONS DESCRIPTION 
8 V Regulated 8 V output. : 8 V ¡¾0.3 V 
: Less than 10 mA 
GND 
Output voltage 
Output current 
Same as ACC(1) pin 2. 
Same as ACC(1) pin 3. 
: 0 to 8.0 V Output voltage BAND Band voltage output. 
(Varies with amateur band) 
Same as ACC (1) pin 8. ALC 
Input/output pin (144 MHz only) Ground level 
VSEND Goes to ground when transmitting. Output current 
When grounded, transmits. 
DACC SOCKETS 
PIN No. NAME ACC (1) 
1
2 
Input/output pin. (HF/50 MHz only) 
3 HSEND Goes to ground when transmitting. 
When grounded, transmits. 
2 
5 
4 
4 
1 3 8 
6 7 
5 
Rear panel view 
6
7
8 
PIN No. NAME ACC (2) 
1
2
3 HSEND 
2 
5 4 4 
1 3 
6 7 
Rear panel view 
5
6
7 
: .0.5 V to +0.8 V 
: Less than 20 mA 
Input current (Tx) : Less than 200 mA 
Same as ACC(1) pin 7. 13.8 V 
8
1 PANEL DESCRIPTION 
!3 !4 
 LCD display 
q
w
e
r
t 
q FREQUENCY READOUTS 
Shows the operating frequency. 
w MULTI-FUNCTION METER INDICATION 
.Shows receiving signal strength, etc. during receive. 
.Shows transmit output power, ALC and SWR during 
transmit. 
e VOX INDICATOR (p. 55) 
Appears when the VOX function is activated. 
r MICROPHONE COMPRESSOR INDICATOR (p. 58) 
Appears when the microphone compressor is activated. 
t MULTI-FUNCTION SWITCH INDICATOR (p. 11) 
Indicates the functions assigned to the multi-function 
switches ([F1]–[F5]). 
y DSP FILTER INDICATOR (p. 50) 
Shows the selected IF filter. 
u MEMORY CHANNEL READOUTS (p. 62) 
Shows the selected memory channel. 
i SELECT MEMORY CHANNEL INDICATOR (p. 72) 
Appears when the selected memory channel is set 
as a select memory channel. 
o BLANK MEMORY INDICATOR (p. 62) 
Appears when the selected memory channel is 
blank. 
9 
!0 
o
i
u 
!1 
!2 MODE INDICATORS (p. 23) 
!3 ANTENNA INDICATOR (p. 75) 
!2 
is selected. 
y 
!0 1/4 TUNING DIAL SPEED INDICATOR (p. 21) 
Appears when the tuning dial speed is set so that 
one rotation is equal to 1/4 of the normal rotation. 
!1 VOICE SQUELCH CONTROL INDICATOR (p. 54) 
Appears during VSC (Voice Squelch Control) function 
is activated. 
Shows the selected operating mode. 
• “D” appears when SSB data, AM data or FM data mode 
Indicates which antenna connector is used for 
HF/50 MHz. 
!4 ANTENNA TUNER INDICATORS (pgs. 76, 77) 
.“TUNE” appears when the antenna tuner is ON; 
“TUNE” appears and flashes during tuning. 
.“EXT” appears when the optional AH-4 external 
antenna tuner is connected to [ANT1].
 LCD display (continued) 
!5 
!6 
!7 
!8 
!9 
@0 
!5 BREAK-IN INDICATORS (p. 56) 
.¡°FBK-IN¡± appears when the full break-in function 
is activated. 
.¡°BK-IN¡± appears when the semi break-in function 
is activated. 
!6 MONITOR INDICATOR (p. 57) 
Appears when the monitor function is activated. 
!7 PREAMP INDICATORS (p. 48) 
Appears when the preamp is activated. 
!8 ATTENUATOR INDICATOR (p. 48) 
Appears when the attenuator is activated. 
!9 AGC INDICATORS (p. 49) 
Shows the selected AGC time constant. 
. ¡°F¡± for AGC fast; ¡°M¡± for AGC middle; ¡°S¡± for AGC 
slow; ¡°-OFF¡± for AGC OFF. 
@0 NOISE BLANKER INDICATOR (p. 51) 
Appears when the noise blanker is activated. 
@1 DTCS INDICATOR (p. 43) 
Appears during DTCS operation. 
@2 TONE SQUELCH INDICATORS 
.¡°T¡± appears when the repeater tone is activated. 
(p. 44) 
.¡°TSQL¡± appears during tone squelch operation. 
(p. 42) 
@3 DUPLEX INDICATOR (p. 44) 
¡°DUP.¡± or ¡°DUP+¡± appears during repeater operation. 
PANEL DESCRIPTION 1 
@8 
@7 
@6 
@5 
@4 
@3 
@9 
@5 NOTCH INDICATORS (p. 53) 
@6 SPLIT INDICATOR (pgs. 59, 60) 
Appears during split operation. 
@7 MEMORY INDICATOR (p. 62) 
Appears during memory mode. 
@8 VFO INDICATORS (p. 20) 
@2 
@1 
@4 NOISE REDUCTION INDICATOR (p. 53) 
Appears when the noise reduction is activated. 
.¡°NOTCH¡± appears when the manual notch function 
is activated. 
.¡°ANOTCH¡± appears when the automatic notch 
function is activated. 
Indicates whether VFO A or VFO B is selected. 
@9 RIT/¡ÓTX INDICATORS (pgs. 48, 57) 
Appears during RIT or ¡ÓTX operation and indicates 
the frequency offset. 
10
1 PANEL DESCRIPTION 
SCP 
F 5 
SCP 
F 5 
SCP 
F 5 
1/4 SCP 
F 5 
SCP 
F 5 
CMP 
F 2 F 3 F 4 
 Multi function switches 
TBW 
F 2 F 3 F 4 
CMP 
During SSB data operation 
1/4 
F 2 F 3 F 4 
DUP 
During CW operation 
1/4 KEY 
F 2 F 3 F 4 
DUP 
During RTTY operation 
RTY 
F 2 F 3 F 4 
DUP 
During AM operation 
DUP 
During FM operation 
DUP TON 
F 2 F 3 F 4 
peater function ON/OFF. 
DM1 FUNCTIONS 
During SSB operation 
DUP AGC 
F 1 
AGC 
F 1 
AGC 
F 1 
AGC 
F 1 
AGC 
F 1 
AGC 
F 1 
AGC (p. 49) 
AGC 
F 1 
DUPLEX (p. 44) 
DUP 
F 2 
SPEECH COMPRESSOR (p. 58) 
CMP 
F 3 
SCP 
F 5 
.Push momentarily to change the time 
constant of the AGC circuit. 
.Push for 1 sec. to enter to the AGC set 
mode. 
.Push momentarily to select the duplex direction 
or turn the function OFF. 
• “DUP–” or “DUP+” indicator appears during 
duplex operation. 
.Push for 1 sec. to turn the one-touch re- 
.Push momentarily to turn the speech 
compressor function ON/OFF. 
• “COMP” indicator appears when the speech 
compressor is ON. 
.Push for 1 sec. to enter to the compres- 
CMP 
sor set mode. 
11 
1/4 TUNING FUNCTION (p. 21) 
Push to turn the 1/4 tuning function 
ON/OFF. 
• “ ” indicator appears when the 1/4 tuning 
function is ON. 
1/4 
F 3 
TRANSMISSION BANDWIDTH (p. 58) 
Push to select the transmission bandwidth. 
•Bandwidth is selectable from narrow, middle 
and wide. 
TBW 
F 4 
MEMORY KEYER MENU (p. 29) 
Push to select the memory keyer or keyer 
send menu, depending on the KEYER 
1st Menu setting in the set mode (p. 86). 
KEY 
F 4 
RTTY MENU (p. 36) 
Push to select the RTTY menu. RTY 
F 4 
BAND SCOPE FUNCTION (p. 47) 
Push to select the band scope screen. SCP 
F 5 
DM2 FUNCTIONS 
SWR SCN 
F 1 
MEM 
SCAN MENU (p. 70) 
TCN 
F 2 F 3 F 4 
Push to select the scan menu. SCN 
F 1 
MEMORY NAME MENU (p. 67) 
MEM 
F 2 
SWR GRAPH FUNCTION (p. 61) 
SWR 
F 3 
TONE CONTROL SET MODE (p. 89) 
TCN 
F 4 
VSC FUNCTION (p. 54) 
VSC 
F 5 
Push to select the memory name screen. 
Push to indicate the SWR graph screen. 
Push to enter the audio tone set mode. 
Push to turn the VSC (Voice Squelch Control) 
function ON and OFF. 
VSC 
F 5
PANEL DESCRIPTION 1 
 Microphone (HM-36) 
q 
w PTT SWITCH 
Push and hold to transmit; release to receive. 
w 
q UP/DOWN SWITCHES [UP]/[DN] 
Change the selected readout frequency or memory 
channel. 
.Continuous pushing changes the frequency or memory 
channel number continuously. 
. While pushing [XFC], the transmit readout frequency can 
be controlled while in spilt frequency operation. 
. The [UP]/[DN] switch can simulate a key paddle. Preset 
in the keyer set mode. (p. 34) 
DESCRIPTION FUNCTION 
[MIC] 
Pin No. 
w
e 
Max. 10 mA 
Ground 
Ground through 470 . 
�gLow�h level 
�gHigh�h level 
+8 V DC output 
Frequency up 
Frequency down 
Squelch open 
Squelch closed 
.MICROPHONE CONNECTOR 
(Front panel view) 
i Main readout AF output 
(varies with [AF]/[BAL]) 
q Microphone input u GND 
(Microphone ground) 
y GND (PTT ground) w +8 V DC output 
e Frequency up/down t PTT 
r Main readout squelch switch 
r 
CAUTION: DO NOT short pin 2 to ground as this 
can damage the internal 8 V regulator. 
NOTE: DC voltage is applied to pin 1 for microphone 
operation. Take care when using a non-Icom 
microphone. 
MICROPHONE CABLE MICROPHONE PLUG 
+ 2k 
4700p 
+ 
0.33ƒÊ 
4700p 
u
y i 
q 
w
e UP DOWN 
r 
t 
470 
.HM-36 SCHEMATIC DIAGRAM
MICROPHONE 
10ƒÊ 
MIC 
ELEMENT 
PTT RECEIVE 
TRANSMIT 
12
2 INSTALLATION AND CONNECTIONS 
 Unpacking 
After unpacking, immediately report any damage to the 
delivering carrier or dealer. Keep the shipping cartons. 
For a description and a diagram of accessory equipment 
included with the IC-746PRO, see ¡®Supplied accessories¡¯ 
on p. ii of this manual. 
 Selecting a location 
Select a location for the transceiver that allows adequate 
air circulation, free from extreme heat, cold, or 
vibrations, and away from TV sets, TV antenna elements, 
radios and other electromagnetic sources. 
The base of the transceiver has an adjustable stand 
for desktop use. Set the stand to one of two angles depending 
on your operating conditions. 
 Antenna connection 
For radio communications, the antenna is of critical importance, 
along with output power and sensitivity. Select 
antenna(s), such as a well-matched 50 §Ù antenna, 
and feedline. 1.5:1 or better of Voltage Standing Wave 
Ratio (VSWR) is recommended for your desired band. 
Of course, the transmission line should be a coaxial 
cable. 
When using 1 antenna, use the [ANT1] connector. 
CAUTION: Protect your transceiver from lightning 
by using a lightning arrestor. 
PL-259 CONNECTOR INSTALLATION EXAMPLE 
q
w
e
r
Antenna SWR 
Each antenna is tuned for a specified frequency 
range and SWR may be increased out-of-range. 
When the SWR is higher than approx. 2.0:1, the 
transceiver¡¯s power drops to protect the final transistor. 
In this case, an antenna tuner is useful to match 
the transceiver and antenna. Low SWR allows full 
power for transmitting even when using the antenna 
tuner. The IC-746PRO has an SWR meter to monitor 
the antenna SWR continuously. 
30 mm Slide the coupling ring 
down. Strip the cable 
jacket and soft solder. 
10 mm (soft solder) Coupling ring 
10 mm Soft 
solder 
1.2 mm 
Strip the cable as 
shown at left. Soft solder 
the center conductor. 
solder solder 
Slide the connector 
body on and solder it. 
Screw the coupling 
ring onto the 
connector body. 
30 mm . 9.8 in 10 mm . 3.8 in 1.2 mm . 1.16 in 
 Grounding 
To prevent electrical shock, television interference 
(TVI), broadcast interference (BCI) and other problems, 
ground the transceiver through the GROUND 
terminal on the rear panel. 
For best results, connect a heavy gauge wire or strap 
to a long earth-sunk copper rod. Make the distance between 
the [GND] terminal and ground as short as possible. 
RWARNING: NEVER connect the [GND] 
terminal to a gas or electric pipe, since the connection 
could cause an explosion or electric shock. 
13
POWER 
TRANSMIT 
PHONES 
ELEC-KEY 
MIC 
 Required connections 
(dot) 
(com) 
(dash) 
PS-125 
(Optional) 
. Front panel 
CW KEY 
A straight key can be used 
when the internal electronic 
keyer is turned OFF in keyer 
set mode. (p. 34) 
.Rear panel
144 MHz ANTENNA (pgs. 13, 75) 
DC POWER SUPPLY 
GROUND (p. 13) 
MICROPHONES (p. 101) 
Connect a VHF 
(60.144 MHz) 
antenna; 
impedance: 50 §Ù. 
Use the heaviest gauge wire or 
strap available and make the 
connection as short as possible. 
Grounding prevents electrical 
shocks, TVI and other problems. 
i746PRO 
ANT TUNER 
NR NOTCH 
A/NOTCH NR 
RF/SQL AF 
MIC GAIN 
HM-36 
INSTALLATION AND CONNECTIONS 2 
TWIN PBT HF/VHF TRANSCEIVER 
1.8 1 3.5 2 7 3 
F-INP 
10 4 14 5 18 6 
21 7 24 8 28 9 SPLIT 
MW PBTC 
GENE 50 144 ENT 0 A/B 
V/M M-CL 
M-CH MP-R MP-W TS 
XFC 
CLEAR ¡ÓTX RIT 
RIT/¡ÓTX 
F 5 F 4 F 3 F 2 F 1 
MENU SSB FILTER AM/FM CW/RTTY 
CALL VOX/BK-IN CW PITCH KEY SPEED RF PWR P.AMP/ATT NB 
LOCK/ 
SPCH MONITOR 
SM-20 
(optional) 
ANTENNA 1, 2 (pgs. 13, 75) 
[Example]: ANT1 for 1.8.18 MHz bands 
ANT2 for 21.50 MHz bands 
STRAIGHT KEY 
(+) 
(_) 
14
2 INSTALLATION AND CONNECTIONS 
When using the AH-4, it must 
be connected to the [ANT1] 
connector. 
i746PRO 
ANT TUNER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
The AFSK modulation signal 
can be input from [MIC]. (p. 78) 
AH-4 (p. 77) 
 Advanced connections 
. Front panel 
HEADPHONES 
.Rear panel 
AH-2b 
ACC SOCKETS (pgs. 8, 78) 
[REMOTE] (p. 95) 
Used for computer control and transceive operation. 
POWER 
TRANSMIT 
PHONES 
ELEC-KEY 
MIC 
MIC 
15 
HF/VHF TRANSCEIVER 
F 2 F 3 F 4 F 1 
MENU CW/RTTY SSB 
CW PITCH RF PWR NB KEY SPEED P.AMP/ATT 
TWIN PBT 
3.5 2 1.8 1 7 3 
F-INP 
10 4 18 6 14 5 
21 7 24 8 28 9 SPLIT 
MW PBTC 
GENE 144 ENT 50 0 A/B 
V/M M-CL 
M-CH TS MP-W MP-R 
TX RX 
LOCK XFC 
RIT CLEAR �İTX 
RIT/�İTX 
F 5 
FILTER AM/FM 
CALL LOCK/ 
SPCH VOX/BK-IN MONITOR 
ANTENNA 1, 2 (p. 17) 
Connects a linear amplifier, 
antenna selector, etc. 
[SEND], [ALC] (p. 17) 
Used for connecting a 
non-Icom linear amplifier. 
[DATA] (p. 78) 
EXTERNAL SPEAKER (p. 101) 
SP-21 
(optional)
INSTALLATION AND CONNECTIONS 
CAUTION: Before connecting the DC power 
cable, check the following important items. Make 
sure: 
•The [POWER] switch is OFF. 
•Output voltage of the power source is 12–15 V 
when you use a non-Icom power supply. 
• DC power cable polarity is correct. 
: positive + terminal 
: negative _ terminal 
Red 
Black 
DC power 
socket 
to DC power 
socket 
 Power supply connections 
Use an optional DC power supply with a 25 A capacity 
and above when operating the transceiver with AC 
power. Refer to the diagrams below. 
CONNECTING PS-125 DC POWER SUPPLY 
PS-125 
Connect to an AC outlet 
using the supplied AC cable. 
DC power cable 
CONNECTING A DC POWER SUPPLY 
AC outlet A DC power supply 
13.8 V; at least 23 A 
Black Red 
_ 
Supplied 
DC power cable 
AC cable 
+ 
30 A fuses 
CONNECTING A VEHICLE BATTERY 
Grommet 
NEVER connect to 
a 24 V battery. 
_ black 
12 V 
battery 
Supplied 
DC power cable 
NEVER connect to a battery without supplied DC 
fuses, otherwise a fire hazard may occur. 
+ red 
2 
Transceiver 
Transceiver 
NOTE: Use terminals for 
the cable connections. 
Crimp 
Solder 
16
2 INSTALLATION AND CONNECTIONS 
 Linear amplifier connections 
CONNECTING THE IC-PW1 
To an 
antenna ACC(1) 
REMOTE ANT 
IC-PW1 
AC outlet 
(Non-European versions: 100.120/220.240 V 
European version : 230 V) 
Turn OFF the transceiver¡¯s antenna tuner while tuning the IC-PW1¡¯s tuner. 
CONNECTING A NON-ICOM LINEAR AMPLIFIER 
To an 
antenna
RF OUTPUT RF INPUT 
ALC 
SEND 
Non-Icom linear amplifier 
Remote control cable (supplied with the IC-PW1) 
ACC cable (supplied with the IC-PW1) 
INPUT1 
EXCITER 
1 1&2 
GND 
50 §Ù coaxial cable 
Transceiver
ALC 
 External antenna tuner connections 
CONNECTING THE AH-4 
The AH-4 must be connected to [ANT1]. 
Coaxial cable (from AH-4) 
ANT1 Transceiver
Control cable 
AH-4 
Ground 
17 
Use the [ANT1] connector when connecting a linear 
amplifier. 
Coaxial cable 
(supplied with the IC-PW1) 
Be sure to connect the cable 
to the 7-pin ACC(2) jack. 
GND 
Transceiver Ground 
ANT1 
SEND 
R WARNING: 
Set the transceiver output power and linear ampli- 
fier ALC output level referring to the linear amplifier 
instruction manual. Be sure the linear amplifier keying 
circuit control voltage is compatible with the IC- 
746PRO, before connecting to [SEND] jack. 
The ALC input level must be in the range 0 V to .4 
V, and the transceiver does not accept positive voltage. 
Non-matched ALC and RF power settings 
could cause a fire or ruin the linear amplifier. 
The specifications for the SEND relay are 16 V/DC 
0.5 A. If this level is exceeded, a large external 
relay must be used. 
Long wire or optional AH-2b 
ACC(2) 
REMOTE 
ANT1
 When first applying power (CPU resetting) 
Before first applying power, make sure all connections 
required for your system are complete by referring to 
Chapter 2. Then, reset the transceiver using the following 
procedure. 
NOTE: When first applying power or when operating 
in cold environments, the display may flicker or 
appear faint. This is normal and will disappear once 
the transceiver has warmed up. 
q Make sure the transceiver power is OFF. 
w While pushing [M-CL] and [F-INP], push [POWER] 
for 1 sec. to turn power ON. 
. The internal CPU is reset. 
. The transceiver displays its initial VFO frequency when 
resetting is complete. 
e Correct the set mode settings after resetting, if desired. 
Resetting CLEARS all programmed contents in 
memory channels and returns programmed values 
in set mode to default values. 
[NOTCH]: Max. CCW [NR]: Max. CCW 
POWER 
TRANSMIT 
PHONES 
ELEC-KEY 
MIC 
F 1 
MENU 
CW PITCH RF PWR KEY SPEED P.AMP/ATT 
i746PRO 
ANT TUNER 
NOTCH NR 
A/NOTCH NR 
AF RF/SQL 
MIC GAIN 
[CW PITCH]: 12 o�fclock 
[POWER] 
HF/VHF TRANSCEIVER 
F 5 F 2 F 3 F 4 
SSB FILTER CW/RTTY AM/FM 
VOX/BK-IN MONITOR NB 
[KEY SPEED]: Max. CCW 
BASIC OPERATION
[F-INP] [M-CL] 
CW : Clockwise 
CCW : Counterclockwise 
3.5 2 1.8 1 7 3 
F-INP 
10 4 18 6 14 5 
21 7 24 8 28 9 SPLIT 
GENE 144 ENT 50 0 A/B 
TS MP-W MP-R 
TX RX 
LOCK XFC 
RIT 
CALL LOCK/ 
SPCH 
 Initial settings 
After resetting the transceiver, set controls and 
switches as shown in the figure below. 
[TRANSMIT]: OFF 
[AF]: Max. CCW 
[RF/SQL]: 12 o�fclock 
[MIC GAIN]: Max. CCW 
[RF PWR]: Max. CCW 
3 
TWIN PBT
MW PBTC 
V/M M-CL 
M-CH 
CLEAR �İTX 
RIT/�İTX 
18
3 BASIC OPERATION 
 Selecting an operating band 
The transceiver has a triple band stacking register. 
This means that the last 3 operating frequencies and 
modes used on a particular band are automatically 
memorized. 
See the table below for a list of the bands available 
and the default settings for each register. 
BAND 
1.8 MHz 
3.5 MHz 
7 MHz 
10 MHz 
14 MHz 
18 MHz 
21 MHz 
24 MHz 
28 MHz 
50 MHz 
144 MHz 
General 
DUsing the band stacking registers 
qPush [14 5], then select a frequency and an operating 
mode. 
•Frequency and operating mode are memorized in the 
first band stacking register. 
wPush [14 5] again, then select another frequency 
and operating mode. 
•This frequency and operating mode are memorized in 
the second band stacking register. 
ePush [14 5] again, then select another frequency 
and operating mode. 
•This frequency and operating mode are memorized in 
the third band stacking register. 
•When a fourth frequency and operating mode are selected 
on a band, the first register set in step q, is overwritten. 
REGISTER 1 
1.900000 MHz CW 
3.550000 MHz LSB 
7.050000 MHz LSB 
10.120000 MHz CW 
14.100000 MHz USB 
18.100000 MHz USB 
21.200000 MHz USB 
24.950000 MHz USB 
28.500000 MHz USB 
50.100000 MHz USB 
145.000000 MHz FM 
15.000000 MHz USB 
19 
REGISTER 2 
1.910000 MHz CW 
3.560000 MHz LSB 
7.060000 MHz LSB 
10.130000 MHz CW 
14.200000 MHz USB 
18.130000 MHz USB 
21.300000 MHz USB 
24.980000 MHz USB 
29.500000 MHz USB 
50.200000 MHz USB 
145.100000 MHz FM 
15.100000 MHz USB 
[Example]: 14 MHz band 
3.5 2 1.8 1 
10 4 14 5 
21 7 24 8 28 9 
GENE 50 0 
Band keys 
REGISTER 3 
1.915000 MHz CW 
3.580000 MHz LSB 
7.020000 MHz CW 
10.140000 MHz CW 
14.050000 MHz CW 
18.150000 MHz USB 
21.050000 MHz CW 
24.900000 MHz CW 
28.100000 MHz CW 
51.000000 MHz FM 
145.200000 MHz FM 
15.200000 MHz USB 
7 3 
18 6 
144 ENT
 Selecting VFO/memory mode 
VFO is an abbreviation of Variable Frequency Oscillator, 
and is commonly referred to as a main tuning function. 
The tuning dial is often called the “VFO knob.” 
. Push [V/M] to switch between VFO and memory 
modes. 
• Pushing [V/M] for 1 sec. transfers the contents of the selected 
memory channel to VFO mode (p. 65). 
 VFO operation 
The transceiver has 2 VFOs and are called VFO A and 
VFO B. You can use the desired VFO to call up a frequency 
and operating mode for your operation. 
DSelecting the VFO A/B 
. Push [A/B] to switch between the VFO A and 
VFO B. 
• “VFO A” or “VFO B” appears. 
DVFO equalization 
. Push [A/B] for 1 sec. to equalize the undisplayed 
VFO condition to the displayed VFO. 
•3 beeps sound when the VFO equalization is completed. 
CONVENIENT 
Use two VFOs as a quick memory 
When you find a new station, but you wish to continue 
searching, the Two VFO system can be used for quick memory 
storage. 
qPush [A/B] for 1 sec. to store the displayed frequency into 
the undisplayed VFO. 
wContinue searching for stations. 
ePush [A/B] to retrieve the stored frequency. 
rTo continue searching for a station, push [A/B] again. 
BASIC OPERATION 
[V/M] 
[A/B] 
Either one appears 
Push for 1 sec. A/B 
3 
20
3 BASIC OPERATION 
 Frequency setting 
The transceiver has several tuning methods for convenient 
frequency tuning. 
DTuning with the tuning dial 
q Push the desired band key on the keypad 1.3 
times. 
. 3 different frequencies can be selected on each band 
with the band key. (p. 19) 
w Rotate the tuning dial to set the desired frequency. 
If the dial lock function is activated, the lock indicator 
lights, and the tuning dial does not function. In this 
case, push [LOCK/SPCH] to deactivate the lock 
function. (see p. 53 for details) 
DQuick tuning step 
The operating frequency can be changed in kHz steps 
(0.1, 1, 5, 9, 10, 12.5, 20 or 25 kHz selectable) for 
quick tuning. 
q Push [SSB], [CW/RTTY] or [AM/FM] to select the 
desired operation mode. 
w Push [TS] momentarily to activate the quick tuning 
function. 
. ¡°¡± appears. 
e Push [TS] for 1 sec. to enter the tuning step set 
mode. 
r Rotate the tuning dial to select the desired tuning 
step. 
t Push [TS] to exit the tuning step set mode. 
D1.4 Tuning step function (SSB data, CW and RTTY only) 
1
While operating in SSB data/CW/RTTY, the 1.4 function 
is available for critical tuning. Dial rotation is reduced to 
.4 of normal when the 1.4 function is in use. 
.While M1 is selected with [MENU], push [F3 1/4] 
to toggle the 1.4 function ON and OFF. 
27 
DAuto tuning step function 
When rotating the tuning dial rapidly, the tuning step 
automatically changes several times as selected. 
q Push [MENU] for 1 sec. to enter the set mode. 
w Push [F1¡Â] or [F2 ¡Ã] to select the DIAL Auto 
TS item. 
e Rotate the tuning dial to select the function ON 
(HIGH or LOW) and OFF. 
.HIGH : Approx. 5 times faster 
.LOW : Approx. 2 times faster 
.OFF : Auto tuning step is turned OFF. 
r Push [MENU] to exit the set mode. 
21 
Select mode 
DIAL Auto TS
HIGH 
SSB 
1kHz 
1.4 indicator 
Band keys 
Tuning dial 
[TS]
DSelecting the 1 Hz step 
The minimum tuning step of 1 Hz can be used for fine 
tuning. 
q Push [TS] momentarily to turn the quick tuning step 
OFF 
• “” disappears. 
w Push [TS] for 1 sec. to toggle the 1 Hz tuning step 
ON and OFF. 
DBand edge warning beep 
When selecting a frequency that lies outside of a 
band’s specified frequency range, a warning beep 
sounds. 
This function can be turned OFF in set mode, if desired. 
(p. 82) 
DFrequency setting with the keypad 
The transceiver has a keypad for direct frequency 
entry as described below. 
q Push [F-INP]. 
•F-INP indicator lights 
w Input the desired frequency. 
• Input “•” (decimal point) between the MHz units and kHz 
units. 
e Push [144 ENT] to enter the input frequency. 
•To cancel the input, push [A/B] instead of [144 ENT]. 
[EXAMPLE] 
14.025 MHz 
GENE 1.8 1 10 4 F-INP Push 
706 kHz 
GENE 50 0 50 0 18 6 21 7 F-INP Push 
21.280 MHz 21.245 MHz 
3.5 2 10 4 14 5 Push F-INP GENE 
BASIC OPERATION 3 
[TS] 
1 Hz indicator 
Lights when keypad input is activated. 
Keypad [F-INP] 
144 ENT 50 0 3.5 2 14 5 
144 ENT 
144 ENT 
22
3 BASIC OPERATION 
 Operating mode selection 
SSB (USB/LSB), SSB data (USB data/LSB data), CW, 
CW reverse (CW-R), RTTY, RTTY-R (RTTY reverse), 
AM, AM data, FM and FM data modes are available in 
the IC-746PRO. Select the desired operation mode as 
follows. 
To select a mode of operation, push the desired mode 
switch momentarily. Push the switch again to toggle 
between USB and LSB, CW/CW-R and RTTY/RTTYR, 
AM and FM, if necessary. Push the switch for 1 sec. 
to toggle between CW and CW-R, RTTY and RTTY-R, 
or to select data mode, if necessary. 
See the diagram below right for the order of selection. 
Microphone signals are muted when data mode is 
selected. 
•Selecting SSB mode 
. Push [SSB] to select USB or LSB. 
• USB is selected first when above 10 MHz; or LSB is selected 
first when below 10 MHz operation. 
• After USB or LSB is selected, push [SSB] to toggle between 
USB and LSB. 
• After USB or LSB is selected, push [SSB] for 1 sec. to 
select USB data or LSB data mode, respectively. 
•Selecting CW/RTTY mode 
. Push [CW/RTTY] to select CW or RTTY. 
•After CW/CW-R or RTTY/RTTY-R is selected, push 
[CW/RTTY] to toggle between CW and RTTY. 
•After CW or RTTY is selected, push [CW/RTTY] for 
1 sec. to toggle between CW and CW reverse, or, RTTY 
and RTTY reverse mode, respectively. 
•Selecting AM/FM mode 
. Push [AM/FM] to select AM or FM. 
• After AM or FM is selected, push [AM/FM] to toggle between 
AM and FM mode. 
• After AM or FM is selected, push [AM/FM] for 1 sec. to 
select AM data or FM data mode, respectively. 
Increases 
Max. audio output 
 Volume setting 
. Rotate [AF] control to output a suitable audio level. 
RF/SQL AF 
Decreases 
No audio output 
23 
[SSB] [CW/RTTY] [AM/FM] 
SSB 
USB D USB 
CW/RTTY 
CW CW-R 
AM/FM 
AM D AM
Push mode switch 
for 1 sec. 
[AF] control 
D LSB LSB 
RTTY-R RTTY 
D FM FM 
Push mode switch 
momentarily.
 Squelch and receive (RF) sensitivity 
Adjusts the RF gain and squelch threshold level. The 
squelch removes noise output from the speaker 
(closed position) when no signal is received. 
• The squelch is particularly effective for FM. It is also available 
for other modes. 
• The control can be set as the RF gain control only (squelch 
is fixed open) or squelch control (RF gain is fixed at maximum) 
in set mode (p. 82). See below right. 
•The 11 to 12 o’clock position is recommended for any setting 
of the [RF/SQL] control. 
OPERATION SET MODE 
RF+SQL 
(default) 
Can be used in all modes. 
Functions as noise squelch or S-meter 
squelch in AM and FM; S-meter 
squelch only in other modes. 
SQL .Operates as a squelch control. 
• RF gain is fixed at max. sensitivity. 
AUTO 
.Operates as an RF gain control in 
SSB, CW and RTTY. 
• Squelch is fixed open. 
.Operates as a squelch control in AM 
and FM. 
• RF gain is fixed at max. sensitivity. 
Adjusting RF gain (Receive sensitivity) 
Normally, [RF/SQL] is set to the 11 o’clock position. 
Rotate [RF/SQL] to the 11 o’clock position for maximum 
sensitivity. 
• Rotating counterclockwise from the maximum position reduces 
sensitivity. 
• The S-meter indicates receive sensitivity. 
Adjusting squelch (Removing non-signal noise) 
Rotate [RF/SQL] clockwise when receiving no signal, 
until the noise just disappears. 
• [RX] indicator light goes out. 
• Rotating [RF/SQL] past the threshold point invokes the Smeter 
squelch— this allows you to set a minimum signal 
level needed to open the squelch. 
[RF/SQL] control 
• When setting as RF gain/squelch control 
Squelch is 
open. 
RF gain 
adjustable 
range 
• When functioning as RF gain control (Squelch is 
fixed open; SSB, CW, RTTY only) 
•When functioning as squelch control (RF gain is 
fixed at maximum) 
BASIC OPERATION 3 
Noise squelch (FM mode) 
Recommended level 
Maximum 
RF gain 
S-meter 
squelch 
Maximum 
RF gain 
Adjustable 
range 
Minimum RF gain
Noise squelch (FM mode) Noise squelch 
threshold 
(FM mode) S-meter squelch 
threshold 
S-meter 
squelch 
Squelch is 
open. 
Deep Shallow 
24
3 BASIC OPERATION 
 Basic transmit operation 
Before transmitting, monitor your selected operating 
frequency to make sure transmitting won’t 
cause interference to other stations on the same 
frequency. It’s good Amateur practice to listen 
first, and then, even if nothing is heard, ask “is 
the frequency in use” once or twice, before you 
begin operating on that frequency. 
DTransmitting 
Before transmitting, monitor your selected operating 
frequency to make sure transmitting won’t cause interference 
to other stations on the same frequency. 
q Push [TRANSMIT] or [PTT] (microphone) to transmit. 
• The [TX] indicator lights red. 
w Push [TRANSMIT] again or release [PTT] (microphone) 
to return to receive. 
DMicrophone gain adjustment 
Before transmitting, monitor your selected operating 
frequency to make sure transmitting won’t cause interference 
to other stations on the same frequency. 
q Push [PTT] (microphone) to transmit. 
•Talk into the microphone at your normal voice level. 
w While talking into the microphone, rotate [MIC 
GAIN] so that the ALC meter reading doesn’t go 
outside the ALC zone (see right). 
e Release [PTT] (microphone) to return to receive. 
25 
[TX] indicator [TRANSMIT] 
[MIC GAIN] [RF PWR] 
ALC zone
RECEIVE AND TRANSMIT 
[TX] indicator [TRANSMIT] 
Tuning dial [SSB] [MIC GAIN] 
¡°LSB¡± or ¡°USB¡± appears 
.Auto notch filter (p. 53) 
. Push [A/NOTCH] to turn the auto or manual 
notch function ON and OFF. 
.Rotate [NOTCH] control to set the attenuating frequency 
for manual notch operation. 
.Twin PBT (passband tuning) (p. 52) 
. Rotate [TWIN PBT] controls (inner/outer). 
. Push [PBTC] to clear the settings. 
. AGC (auto gain control) (p. 49) 
. While M1 is selected with [MENU], push 
[F1 AGC] several times to select AGC F, 
AGC M, AGC S or AGC OFF. 
. VSC (voice squelch control) (p. 54) 
. While M2 is selected with [MENU], push 
[F5 VSC] to turn the VSC function ON and OFF. 
.The VSC indicator appears when the voice squelch 
function is set to ON. 
.Transmit quality monitor (p. 57) 
. Push [MONITOR] to turn the monitor function ON 
and OFF. 
.¡°MONI¡± appears when the monitor function is set to 
ON. 
. Audio tone control (p. 89) 
. While M2 is selected with [MENU], push [F4 
TCN], select an item with [F1 ¡Â] and [F2 ¡Ã] then 
rotate the tuning dial to adjust the audio tone. 
Operating SSB 
q Push a band key to select the desired band. 
w Push [SSB] to select LSB or USB. 
.Below 10 MHz LSB is automatically selected; above 
10 MHz USB is automatically selected. 
e Rotate [AF] to set audio to a comfortable listening 
level. 
r Rotate the tuning dial to tune a desired signal. 
. S-meter indicates received signal strength. 
t Push [TRANSMIT] or [PTT] (microphone) to transmit. 
. The TX indicator lights red. 
y Speak into the microphone at your normal voice 
level. 
. Adjust [MIC GAIN] at this step, if necessary. 
u Push [TRANSMIT] or release [PTT] (microphone) to 
return to receive. 
DConvenient functions for receive 
.Preamp and attenuator (p. 48) 
. Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.¡°P.AMP1,¡± ¡°P.AMP2¡± or ¡°P.AMP¡± appears when the 
preamp 1, preamp 2 or preamp is set to ON, respectively. 
(depending on operating frequency band) 
. Push [P.AMP/ATT] for 1 sec. to set the attenuator 
ON. 
.Push [P.AMP/ATT] momentarily to turn the attenuator 
OFF. 
. ¡°ATT¡± appears when the attenuator is set to ON. 
.Noise blanker (p. 51) 
. Push [NB] to turn the noise blanker ON and OFF. 
. ¡°NB¡± appears when the noise blanker is set to ON. 
. Push [NB] for 1 sec. to enter noise blanker set mode. 
.Noise reduction (p. 53) 
. Push [NR] to turn the noise reduction ON and OFF. 
. Rotate [NR] control to adjust the noise reduction level. 
. ¡°NR¡± appears when the noise reduction is set to ON. 
DConvenient functions for transmit 
.Speech compressor (p. 58) 
. While M1 is selected with [MENU], push 
[F3 CMP] to turn the speech compressor ON and 
OFF. 
.¡°COMP¡± appears when the speech compressor is set 
to ON. 
. VOX (voice operated transmit) (p. 55) 
. Push [VOX/BK-IN] to turn the VOX function ON 
and OFF. 
. ¡°VOX¡± appears when the VOX function is set to ON. 
4 
Band keys 
26
4 RECEIVE AND TRANSMIT 
Operating CW 
q Push a band key to select the desired band. 
w Push [CW/RTTY] to select CW. 
. After CW mode is selected, push [CW/RTTY] for 1 sec. 
to toggle between CW and CW-R modes. 
e Rotate [AF] to set audio to a comfortable listening 
level. 
r Rotate the tuning dial to simultaneously tune a desired 
signal and its side tone. 
. S-meter indicates received signal strength. 
t Push [TRANSMIT] to transmit. 
. The TX indicator lights red. 
y Use the electric keyer or paddle to key your CW signals. 
. The Po meter indicates transmitted CW signal strength. 
u Adjust CW speed with [KEY SPEED]. 
i Push [TRANSMIT] to return to receive. 
DConvenient functions for receive 
.Preamp and attenuator (p. 48) 
. Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.�gP.AMP1,�h �gP.AMP2�h or �gP.AMP�h appears when the 
preamp 1, preamp 2 or preamp is set to ON, respectively. 
(depending on operating frequency band) 
. Push [P.AMP/ATT] for 1 sec. to set the attenuator 
ON. 
.Push [P.AMP/ATT] momentarily to turn the attenuator 
OFF. 
. �gATT�h appears when the attenuator is set to ON. 
.Noise blanker (p. 51) 
. Push [NB] to turn the noise blanker ON and OFF. 
. �gNB�h appears when the noise blanker is set to ON. 
. Push [NB] for 1 sec. to enter noise blanker set mode. 
.Noise reduction (p. 53) 
. Push [NR] to turn the noise reduction ON and 
OFF. 
. Rotate [NR] control to adjust the noise reduction level. 
. �gNR�h appears when the noise reduction is set to ON. 
DConvenient functions for transmit 
. Break-in function (p. 56) 
. Push [VOX/BK-IN] several times to set the breakin 
OFF, semi break-in or full break-in. 
.�gBK-IN�h or �gF BK-IN�h appears when the semi break-in 
or full break-in is set to ON, respectively. 
27 
Band keys [TX] indicator [TRANSMIT] 
[CW/RTTY] [CW PITCH] Tuning dial 
[KEY SPEED] �gCW�h or �gCW-R�h appears 
.Auto notch filter (p. 53) 
. Push [A/NOTCH] to turn the auto or manual 
notch function ON and OFF. 
.Rotate [NOTCH] control to set the attenuating frequency 
for manual notch operation. 
.Twin PBT (passband tuning) (p. 52) 
. Rotate [TWIN PBT] controls (inner/outer). 
. Push [PBTC] to clear the settings. 
. AGC (auto gain control) (p. 49) 
. While M1 is selected with [MENU], push 
[F1 AGC] several times to select AGC F, 
AGC M, AGC S or AGC OFF. 
. 1.4 function (p. 21) 
. While M1 is selected with [MENU], push 
[F3 1/4] to turn the 1.4 function ON and OFF.
DAbout CW reverse mode 
CW reverse mode receives CW signals with a reverse 
side CW carrier point like that of LSB and USB modes. 
Use when interfering signals are near a desired signal 
and you want to change the interference tone. 
q Push [CW/RTTY] several times to select CW mode. 
w Push [CW/RTTY] for 1 sec. to select CW or CW-R 
mode. 
• Check the interfering tone. 
DAbout CW pitch control 
The received CW audio pitch and monitored CW audio 
can be adjusted to suit your preference (300 to 900 Hz 
in 25 Hz steps) without changing the operating frequency. 
DAbout keying speed 
The transceiver’s internal electronic keyer speed can 
be adjusted from 6 to 60 wpm. 
. Rotate [KEY SPEED] clockwise to increase keying 
speed; counterclockwise to decrease keying speed. 
DCW side tone function 
When the transceiver is in the receive condition (and 
the break-in function is OFF— p. 56) you can listen to 
the tone of your CW signal without actually transmitting. 
This allows you to match your transmit signal exactly 
to another station’s. This also convenient for CW 
practice. CW side tone level can be adjusted in keyer 
set mode (p. 33). 
RECEIVE AND TRANSMIT 
Push for 1 sec. 
CW/RTTY 
BFO 
Interference Desired signal 
CW mode (LSB side) 
[CW PITCH] 
[KEY SPEED] 
4 
BFO 
Interference Desired signal 
CW-R mode (USB side) 
28
4 RECEIVE AND TRANSMIT 
Electronic keyer functions 
The transceiver has a number of convenient functions 
for the electronic keyer that can be accessed from the 
memory keyer menu. 
q Push [CW/RTTY] to select CW mode. 
w Push [MENU] to select M1. 
e Push [F4 KEY] to select the memory keyer menu. 
•The selectable menu can be changed with the keyer 
send menu in the set mode. (p. 87) 
r Push one of the multi-function keys ([F1] to [F5]) to 
select an item in the memory keyer menu. See the 
diagram below. 
• Push [MENU] to return to the previous indication. 
DIN CW MODE 
AGC DUP 1/4 KEY SCP 
F 1 F 2 F 3 F 4 F 5 
Push [F4] 
Push [MENU] 
• Memory keyer menu 
SND EDT 001 SET 
F 1 F 2 F 3 F 4 F 5 
29 
[MENU] [CW/RTTY] 
• Keyer send menu (p. 30) 
Push 
[F2] 
M1 M2 M3 M4 -1 
F 1 F 2 F 3 F 4 F 5 
• Edit menu (p. 31) 
Push 
[F3] CQ TEST CQ TEST 
M1 ç å DEL SPC 
F 1 F 2 F 3 F 4 F 5 
• Contest number set mode (p. 32) 
Push 
[F4] 
1
Number Style 
Normal 
F 1 F 2 F 3 F 4 F 5 
• Keyer set mode (p. 33) Push 
[F5] 
1
Side Tone Level 
5O% 
F 1 F 2 F 3 F 4 F 5
DMemory keyer send menu 
Pre-set characters can be sent using the keyer send 
menu. Contents of the memory keyer are set using the 
edit menu. 
•Transmitting 
q While M1 is selected in CW mode, push [F4 KEY] 
to select the memory keyer menu. 
w Push [F2 SND] to select the keyer send menu. 
e Push [TRANSMIT] to set the transceiver to transmit, 
or set the break-in function ON (p. 56). 
r Push one of the function keys ([F1] to [F4]) to send 
the contents of the memory keyer. 
• The contest number counter, above [F5], is incremented 
• Pushing a function key for 1 sec. repeatedly sends the 
contents; push any function key to cancel the transmission. 
each time the contents are sent. 
• Push [F5] to reduce the contact number count by 1 when 
resending contents to unanswered calls. 
For your information 
When an external keypad is connected to the 
pin 3 and pin 7 of the [MIC] connector, the programmed 
contents, M1—M4, can be transmitted 
without selecting the keyer send menu. 
See p. 87 for details. 
t Push [MENU] 2 times to return to M1. 
M1 send indication 
CQ TEST CQ 001 
M1 M2 M3 M4 -1 
F 1 
Repeat send indication 
CQ TEST CQ 001 
M1 M2 M3 M4 -1 
Repeat indicators 
M3 send indication 
QRZ? 
M1 M2 M3 M4 -1 
F 3 
RECEIVE AND TRANSMIT 
001 
M1 M2 M3 M4 -1 
F 2 F 3 F 4 F 1 
M2 send indication 
F 5 
UR 5NN001 B 001 
M1 M2 M3 M4 -1 
F 2 
M2 send indication 
UR 5NN001 B 001 
M1 M2 M3 M4 -1 
Count up trigger 
indicator 
M4 send indication 
Counter 
CFM TU 001 
M1 M2 M3 M4 -1 
F 4 
4 
30
4 RECEIVE AND TRANSMIT 
DEditing a memory keyer 
The contents of the memory keyer memories can be 
set using the memory keyer edit menu. The memory 
keyer can memorize and re-transmit 4 CW key codes 
for often-used CW sentences, contact numbers, etc. 
Total capacity of the memory keyer is 50 characters 
per memory channel. 
•Programming contents 
q Push [MENU] to select M1, then push [F4 KEY] to 
select the memory keyer menu. 
w Push [F3 EDIT] to select edit menu. 
• Memory keyer contents of the Channel 1 (M1) is indicated. 
• Push [F5] to manually increment the contest number. 
e Push [F1] to select the desired memory keyer channel 
to be edited. 
r Input the desired character by rotating the tuning 
dial or by pushing the keypad for number input. 
• Selectable characters (with the tuning dial); 
A B C D E F G H I J K L M N O P Q R S T 
U V W X Y Z / ? . , * ^ 
NOTE: 
“^” is used to transmit a following word with no 
space such as AR. Put “^” before a text string 
such as ^AR, and the string “AR” is sent with no 
space. 
“*” is used to insert the CW contact number. The 
contact number automatically increments by 1. 
This function is only available for one memory 
keyer channel at a time. Memory keyer channel 
M2 used “*” by default. 
t Push [F2 ç] or [F3 å] to move the cursor backwards 
or forwards, respectively. 
y Repeat steps r and t to input the desired characters. 
u Push [MENU] 2 times to return to M1. 
Pre-programmed contents 
Contents CH 
M1 CQ TEST CQ TEST DE JA1 JA1 TEST 
M2 UR 5NN* BK 
M3 CFM TU 
M4 QRZ? 
31 
• Edit menu
CQ TEST CQ TEST 
M1 ç å DEL SPC 
F 2 F 3 F 4 F 1 
Move cursor left/right 
Clear character Select M1 to M4 
¥ M2 default indication 
F 5 
Input space 
UR 5NN* BK 
M2 ç å DEL SPC 
When inputting an asterisk, 
the counter is incremented by 1. 
¥ M3 default indication 
CFM TU 
M3 ç å DEL SPC 
¥ M4 default indication 
QRZ? 
M4 ç å DEL SPC 
Example display— when inputting QSL TU 
DE JA3YUA TEST into M3. 
QSL TU DE JA3Y 
M3 ç å DEL SPC 
DE JA3YUA TEST 
M3 ç å DEL SPC
DContest number set mode 
This menu is used to set the contest (serial) number 
and count up trigger, etc. 
. Setting contents 
q Push [MENU] to select M1, then push [F4 KEY] to 
select the memory keyer menu. 
w Push [F4 001] to enter the contest number set 
mode. 
e Push [F1¡Â] or [F2 ¡Ã] to select the desired set item. 
r Set the desired condition using the tuning dial. 
.Push [F3] for 1 sec. to select a default condition or value. 
t Push [MENU] 2 times to return to M1. 
1. Number Style 
This item sets the numbering system used for contact 
(serial) numbers. normal or morse cut numbers. 
: Does not use morse cut number 
(default) 
.190 ANO : Sets 1 as A, 9 as N and 0 as O. 
.Normal 
.190 ANT : Sets 1 as A, 9 as N and 0 as T. 
NO : Sets 9 as N and 0 as O. 
NT : Sets 9 as N and 0 as T. 
. 90 
. 90 
2. Count Up Trig 
This selects which of the four memory slots will have 
the contest serial number exchange. The count up 
trigger allows the serial number to e automatically incremented 
after each complete serial number exchange 
is sent. 
. M1, M2, M3 and M4 can be set. (default: M2) 
3. Present Number 
This item shows the current number for the count up 
trigger channel set above. 
.Rotate the tuning dial to change the number, or push 
[F3 CLR] for 1 sec. to reset the current number to 001. 
RECEIVE AND TRANSMIT 
F 1 
Side Tone Level 
1 
F 2 F 3 F 4 
Set item up/down 
1
2
3
Number Style 
Normal 
Count Up Trig 
M2 
Present Number 
CLR 001 
5O% 
F 5 
4 
32
4 RECEIVE AND TRANSMIT 
*SPACE and DOT length can be 
adjusted with [KEY SPEED] only. 
Dot/Dash Ratio 
1:1:3.O 
DKeyer set mode 
This set mode is used to set the CW side tone, memory 
keyer repeat time, dash weight, paddle specifications, 
keyer type, etc. 
. Setting contents 
q Push [MENU] to select M1, then push [F4 KEY] to 
select the memory keyer menu. 
w Push [F5 SET] to select keyer set mode. 
e Push [F1¡Â] or [F2 ¡Ã] to select the desired set item. 
r Set the desired condition using the tuning dial. 
.Push [F3] for 1 sec. to select a default condition or value. 
t Push [MENU] 2 times to return to M1. 
1. Side Tone Level 
This item sets the CW side tone output level. 
. 0 to 100% in 1% steps can be selected. 
2. Side Tone L-lmt 
This item sets the CW side tone level limit. When the 
[AF] control is rotated above a specified level, the CW 
side tone does not increase. 
CW side tone level is limited. (default) 
CW side tone level is not limited. 
ON 
OFF 
3. Repeat Time 
When sending CW using the repeat timer, this item 
sets the time between transmission. 
. 1 to 60 sec. in 1 sec. steps can be selected. 
4. Dot/Dash Ratio 
This item sets the dot/dash ratio. 
. 1:1:2.8 to 1:1:4.5 (in 0.12 steps) can be selected. 
Keying weight example: Morse code ¡°K¡± 
DOT (fixed*)
DASH DASH Weight setting: 
1:1:3 (default) 
Weight setting: 
Adjusted
Adjustable range SPACE (fixed*) 
33 
5O% 
F 5 F 1 
Side Tone Level 
1 
F 2 F 3 F 4 
Set item up/down 
Side Tone Level 
5O% 1
2
Side Tone L-lmt 
ON
2s 
Repeat Time 
3
4
Set Tx power level 
5. Rise Time 
This item sets the envelop time period which the output 
power becomes the set transmit power. 
• 2, 4, 6 or 8 msec. can be selected. 
• About rise time
Tx 
Key action 
Rx 
Tx output power 
Time 
6. Paddle Polarity 
This item sets the paddle polarity. 
• Normal and reverse polarity can be selected. 
7. Keyer Type 
This item selects the keyer type for [ELEC-KEY] connector 
on the front panel. 
•ELEC-KEY, BUG KEY and Straight key can be selected. 
8. MIC U/D Keyer 
This item allows you to set the microphone [UP]/[DN] 
keys to be used as a paddle. 
[UP]/[DN] switches can be used for CW. 
[UP]/[DN] switches cannot be used for 
CW. 
ON 
OFF 
NOTE: When “ON” is selected, the frequency and 
memory channel cannot be changed using 
the [UP]/[DN] switches. 
RECEIVE AND TRANSMIT 4 
Rise Time 
5 4ms 
Paddle Polarity 
NORMAL 6
Keyer Type 
7 ELEC-KEY 
MIC U/D Keyer 
OFF 8 
34
4 RECEIVE AND TRANSMIT 
Operating RTTY (FSK) 
Before operating RTTY, be sure to consult the manual 
that comes with your TNC. 
q Push a band key to select the desired band. 
w Push [CW/RTTY] several times to select RTTY. 
. After RTTY mode is selected, push [CW/RTTY] for 
1 sec. to toggle RTTY and RTTY-R modes. 
e Rotate [AF] to set audio to a comfortable listening 
level. 
r Rotate the tuning dial to tune a desired signal. 
. S-meter indicates received signal strength. 
. If the received signal cannot be demodulated, try selecting 
RTTY-R mode. 
t Push [TRANSMIT] to set the transceiver to the 
transmit condition or transmit a SEND signal from 
your TNC. 
. The TX indicator lights red. 
. The Po meter indicates transmitted RTTY signal strength. 
y Operate the connected PC or TNC (TU) to transmit 
RTTY (FSK) signals. 
. Adjust [MIC GAIN] at this step, if necessary. 
u Push [TRANSMIT] to return to receive. 
DConvenient functions for receive 
.Preamp and attenuator (p. 48) 
. Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.�gP.AMP1,�h �gP.AMP2�h or �gP.AMP�h appears when the 
preamp 1, preamp 2 or preamp is set to ON, respectively. 
(depending on operating frequency band) 
. Push [P.AMP/ATT] for 1 sec. to set the attenuator 
ON. 
.Push [P.AMP/ATT] momentarily to turn the attenuator 
OFF. 
. �gATT�h appears when the attenuator is set to ON. 
.Noise blanker (p. 51) 
. Push [NB] to turn the noise blanker ON and OFF. 
. �gNB�h appears when the noise blanker is set to ON. 
. Push [NB] for 1 sec. to enter noise blanker set mode. 
DConvenient functions for transmit 
.Transmit quality monitor (p. 57) 
. Push [MONITOR] to turn the monitor function ON 
and OFF. 
. �gMONI�h appears when the monitor function is set to 
ON. 
35 
Band keys [TX] indicator [TRANSMIT] 
Tuning dial [CW/RTTY] 
�gRTTY�h or �gRTTY-R�h appears 
.Noise reduction (p. 53) 
. Push [NR] to turn the noise reduction ON and 
OFF. 
. Rotate [NR] control to adjust the noise reduction level. 
. �gNR�h appears when the noise reduction is set to ON. 
.Twin PBT (passband tuning) (p. 52) 
. Rotate [TWIN PBT] controls (inner/outer). 
.Push [PBT C] to clear the settings. 
. AGC (auto gain control) (p. 49) 
. While M1 is selected with [MENU], push 
[F1 AGC] several times to select AGC F, 
AGC M, AGC S or AGC OFF. 
. 1.4 function (p. 21) 
. While M1 is selected with [MENU], push 
[F3 1/4] to turn the 1.4 function ON and OFF.
RTTY functions 
The transceiver has a number of convenient functions 
for the RTTY operation that can be accessed from the 
RTTY menu. 
q Push [CW/RTTY] to select RTTY mode. 
w Push [MENU] to select M1. 
e Push [F4 RTY] to select the RTTY menu. 
r Push one of the multi-function keys ([F2], [F4] or 
[F5]) to select an item in the RTTY menu. See the 
diagram below. 
• Push [MENU] to return to the previous indication. 
DIN RTTY MODE 
AGC DUP 1/4 RTY SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] 
• RTTY menu 
F 1 
RTTY-FIL ON 
DEC FIL SET 
F 5 F 4 F 3 F 2 
Push [F2] 
• RTTY decoder screen (p. 38) 
F 5 F 4 F 3 F 2 
ADJ 
F 1 
DAbout RTTY reverse mode 
Received characters are occasionally garbled when 
the receive signal is reversed between MARK and 
Space. This reversal can be caused by incorrect TNC 
connections, setting, commands, etc. To receive reversed 
RTTY signals correctly, select RTTY-R mode. 
. While RTTY mode is selected, push [CW/RTTY] 
for 1 sec. to select the RTTY reverse mode. 
•“RTTY-R” appears when the RTTY reverse mode is selected. 
•Push [CW/RTTY] for 1 sec. again to select the normal 
RTTY mode. 
RECEIVE AND TRANSMIT 
[MENU] [CW/RTTY] 
Switches RTTY filter ON and OFF. 
F 1 Push 
[F4] 
Push 
DEC FIL SET 
F 5 F 4 F 3 F 2 
• RTTY filter set mode (p. 37) 
[F4] for 
1 sec. 
35O
F 5 F 1 
[F5] 
Band Width 
1 
F 4 F 3 F 2 
Push • RTTY set mode (p. 39) 
F 4 F 1 
Normal 
170 Hz 
RTTY Mark 
1 
F 3 F 2 
Reverse 
2125 Hz 2125 Hz 
Space BFO BFO 
2125 
F 5 
170 Hz
Mark Space Mark 
4 
36
4 RECEIVE AND TRANSMIT 
DRTTY filter/Twin peak filter 
The transceiver has 5 RTTY filters in addition to normal 
IF filters. The passband width can be selected 
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. 
When the RTTY filter is turned ON, the RTTY tuning 
meter can be used. 
Moreover, the twin peak filter changes the receive frequency 
response by boosting 2 particular frequencies 
(2125 and 2295 Hz) for better copying of desired 
RTTY signals. 
.RTTY filter and twin peak filter setting 
q Push [CW/RTTY] to select RTTY mode. 
. After RTTY mode is selected, push [CW/RTTY] for 1 sec. 
to select RTTY-R mode. 
w Push [MENU] several times to select M1. 
e Push [F4 RTY] to select RTTY menu. 
r Push [F4 FIL] to turn the RTTY filter ON and OFF. 
.When the RTTY filter is turned ON, the normal IF filter 
number indication (1, 2 or 3) disappears. 
t Push [F4 FIL] for 1 sec. to enter RTTY filter set 
mode (see below). 
y Push [F1¡Â] to select bandwidth item. 
u Rotate the tuning dial to select the RTTY filter width 
from 1 kHz, 500 Hz, 350 Hz, 300 Hz and 250 Hz. 
. Push [F3] for 1 sec. to select a default value. 
i Push [F2 ¡Ã] to select twin peak filter item. 
.The received audio volume may become greater when 
the twin peak filter is turned ON. 
o Rotate the tuning dial to turn the twin peak filter 
function ON and OFF. 
!0 Push [MENU] 2 times to return to M1. 
.RTTY filter set mode 
1. Band Width 
This item sets the RTTY filter width. 
. 250, 300, 350, 500 Hz and 1 kHz can be selected. 
2. Twin Peak FIL 
This item turns the twin peak filter ON and OFF. 
37 
AGC DUP 1/4 RTY SCP 
F5 F4 F3 F2 F1 
RTTY filter indicator 
Push [F4] 
Rotate the tuning dial to the 
point where both sides of the 
dots appear equally. 
F1 
2
RTTY-FIL ON 
DEC FIL SET 
F5 F4 F3 F2 
Disappears when the RTTY 
filter is turned OFF. 
Band Width 
1 35O 
Twin Peak FIL 
ON
DRTTY decoder 
The transceiver has an RTTY decoder for Baudot 
(mark freq.: 2125 Hz, shift freq.: 170 Hz, 45 bps). 
An external terminal unit (TU) or terminal node connector 
(TNC) is not necessary for receiving a Baudot 
signal. 
q Push [CW/RTTY] to select RTTY mode. 
• After RTTY mode is selected, push [CW/RTTY] for 1 sec. 
to select RTTY-R mode. 
w Push [MENU] several times to select M1. 
e Push [F4 RTY] to select RTTY menu. 
r Push [F4 FIL] to turn the RTTY filter ON. 
•The RTTY decoder does not function when the RTTY filter 
is turned OFF. 
t Push [F2 DEC] to turn the RTTY decoder ON. 
•RTTY decoder screen appears. 
y Push [F2] to freeze the current screen. 
• “H” appears while the function is in use. 
u Push [F3] for 1 sec. to clear the displayed characters. 
i Push [MENU] to exit the RTTY decoder screen. 
• Setting the decoder threshold level 
Adjust the RTTY decoder threshold level if some characters 
are displayed when no signal is received. 
q Call up the RTTY decoder screen as described 
above. 
w Push [F1 ADJ] to select the threshold level setting 
condition. 
e Rotate the tuning dial to adjust the RTTY decoder 
threshold level. 
• Push [F3] for 1 sec. to select the default condition. 
r Push [MENU] to exit the RTTY decoder screen. 
The number of line of text can be selected from 2 or 
3 in the display. The UnShift On Space (USOS) 
function and new line code can be set in the RTTY 
set mode. (p. 39) 
AGC DUP 1/4 RTY SCP 
F 2 F 1 
F 1 
F 5 F 4 F 3 
Push [F4] 
ADJ 
F 1 
Appears while the RTTY decoder screen is freezed 
with [F2] operation. 
Push [F3] to erase the displayed characters. 
ADJ 
F 1 
Push [F1] 
RTTY-FIL ON 
DEC FIL SET 
F 2 
Push [F2] 
F 2 
F 2 
F 2 
F 5 F 4 F 3 
F 5 F 4 F 3 
F 5 F 4 F 3 
F 5 F 4 F 3 
å 9 
F 1 
Threshold level indication 
RECEIVE AND TRANSMIT 4 
38
4 RECEIVE AND TRANSMIT 
DRTTY set mode 
This set mode is used to set the mark and shift frequencies, 
keying type, decode USOS function, etc. 
. Setting contents 
q Push [MENU] to select M1, then push [F4 RTY] to 
select the RTTY menu. 
w Push [F5 SET] to select RTTY set mode. 
e Push [F1¡Â] or [F2 ¡Ã] to select the desired set item. 
r Set the desired condition using the tuning dial. 
.Push [F3] for 1 sec. to select a default condition or value. 
t Push [MENU] 2 times to return to M1. 
1. RTTY Mark 
Sets the mark frequency for RTTY operation. 
. 1275, 1615 and 2125 Hz are selectable. 
2. RTTY Shift 
Sets the shift frequency for RTTY operation. 
. 170, 200 and 425 Hz are selectable. 
3. RTTY Keying 
Selects the keying polarity from normal and reverse. 
NORMAL Key open/close = Mark/Space 
REVERSE Key open/close = Space/Mark 
4. Decode USOS 
Turn the USOS (UnShift On Space) function ON/OFF 
Decode as letter code 
Decode as character code 
ON 
OFF 
5. Decode New Line 
Selects the new line code of the internal RTTY decoder. 
CR: Carriage Return; LF: Line Feed 
CR, LF and CR+LF 
CR+LF only 
CR,LF,CR+LF 
CR+LF 
6. Decode Screen 
Selects the number of the decoder indication from 2 
or 3 lines. 
39 
F 4 F 1 
RTTY Mark 
1 
F 3 F 2 
Set item up/down 
RTTY Mark 
1
RTTY Shift 
2
RTTY Keying 
3 NORMAL 
Decode USOS 
4
Decode New Line 
5 CR,LF,CR+LF 
Decode Screen 
6 
2125 
F 5 
2125 
17O 
ON 
3line
Operating AM 
q Push a band key to select the desired band. 
w Push [AM/FM] to select AM. 
e Rotate [AF] to set audio to a comfortable listening 
level. 
r Rotate the tuning dial to tune a desired signal. 
. S-meter indicates received signal strength. 
. The default tuning step for AM mode is 1 kHz; this can 
be changed using the tuning step program mode. (p. 21) 
t Push [TRANSMIT] or [PTT] (microphone) to transmit. 
. The TX indicator lights red. 
y Speak into the microphone at your normal voice 
level. 
. Adjust [MIC GAIN] at this step, if necessary. 
u Push [TRANSMIT] or release [PTT] (microphone) to 
return to receive. 
DConvenient functions for receive 
.Preamp and attenuator (p. 48) 
. Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.¡°P.AMP1,¡± ¡°P.AMP2¡± or ¡°P.AMP¡± appears when the 
preamp 1, preamp 2 or preamp is set to ON, respectively. 
(depending on operating frequency band) 
. Push [P.AMP/ATT] for 1 sec. to set the attenuator 
ON. 
.Push [P.AMP/ATT] momentarily to turn the attenuator 
OFF. 
. ¡°ATT¡± appears when the attenuator is set to ON. 
.Noise blanker (p. 51) 
. Push [NB] to turn the noise blanker ON and OFF. 
. ¡°NB¡± appears when the noise blanker is set to ON. 
. Push [NB] for 1 sec. to enter noise blanker set mode. 
.Noise reduction (p. 53) 
. Push [NR] to turn the noise reduction ON and OFF. 
. Rotate [NR] control to adjust the noise reduction level. 
. ¡°NR¡± appears when the noise reduction is set to ON. 
DConvenient functions for transmit 
.Speech compressor (p. 58) 
. While M1 is selected with [MENU], push [F3 
CMP] to turn the speech compressor ON and 
OFF. 
.¡°COMP¡± appears when the speech compressor is set 
to ON. 
. VOX (voice operated transmit) (p. 55) 
. Push [VOX/BK-IN] to turn the VOX function ON 
and OFF. 
. ¡°VOX¡± appears when the VOX function is set to ON. 
RECEIVE AND TRANSMIT 4 
Band keys [TX] indicator [TRANSMIT] 
[AM/FM] Tuning dial [MIC GAIN] 
Appears 
.Auto notch filter (p. 53) 
. Push [A/NOTCH] to turn the auto or manual 
notch filter ON and OFF. 
.Rotate [NOTCH] control to set the attenuating frequency 
for manual notch operation. 
. IF shift (p. 52) 
. Rotate [TWIN PBT] controls (inner only). 
. Push [PBTC] to clear the settings. 
. AGC (auto gain control) (p. 49) 
. While M1 is selected with [MENU], push [F1 
AGC] several times to select AGC F, AGC M, 
AGC S or AGC OFF. 
. VSC (voice squelch control) (p. 54) 
. While M2 is selected with [MENU], push 
[F5 VSC] to turn the VSC function ON and OFF. 
.The VSC indicator appears when the voice squelch 
function is set to ON. 
.Transmit quality monitor (p. 57) 
. Push [MONITOR] to turn the monitor function ON 
and OFF. 
.¡°MONI¡± appears when the monitor function is set to 
ON. 
. Audio tone control (p. 89) 
. While M2 is selected with [MENU], push [F4 
TCN], select an item with [F1 ¡Â] and [F2 ¡Ã] then 
rotate the tuning dial to adjust the audio tone. 
40
4 RECEIVE AND TRANSMIT 
Operating FM 
q Push a band key to select the desired band. 
w Push [AM/FM] to select FM. 
e Rotate [AF] to set audio to a comfortable listening 
level. 
r Rotate the tuning dial to tune a desired signal. 
. S-meter indicates received signal strength. 
t Push [TRANSMIT] or [PTT] (microphone) to transmit. 
. The TX indicator lights red. 
y Speak into the microphone at your normal voice 
level. 
. Adjust [MIC GAIN] at this step, if necessary. 
u Push [TRANSMIT] or release [PTT] (microphone) to 
return to receive. 
DConvenient functions for receive 
.Preamp and attenuator (p. 48) 
. Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.¡°P.AMP1,¡± ¡°P.AMP2¡± or ¡°P.AMP¡± appears when the 
preamp 1, preamp 2 or preamp is set to ON, respectively. 
(depending on operating frequency band) 
. Push [P.AMP/ATT] for 1 sec. to set the attenuator 
ON. 
.Push [P.AMP/ATT] momentarily to turn the attenuator 
OFF. 
. ¡°ATT¡± appears when the attenuator is set to ON. 
.Noise blanker (p. 51) 
. Push [NB] to turn the noise blanker ON and OFF. 
. ¡°NB¡± appears when the noise blanker is set to ON. 
. Push [NB] for 1 sec. to enter noise blanker set mode. 
DConvenient functions for transmit 
.Speech compressor (p. 58) 
. While M1 is selected with [MENU], push [F3 
CMP] to turn the speech compressor ON and 
OFF. 
.¡°COMP¡± appears when the speech compressor is set 
to ON. 
. VOX (voice operated transmit) (p. 55) 
. Push [VOX/BK-IN] to turn the VOX function ON 
and OFF. 
. ¡°VOX¡± appears when the VOX function is set to ON. 
41 
Band keys [TX] indicator [TRANSMIT] 
[AM/FM] Tuning dial [MIC GAIN] 
Appears 
.Noise reduction (p. 53) 
. Push [NR] to turn the noise reduction ON and OFF. 
. Rotate [NR] control to adjust the noise reduction level. 
. ¡°NR¡± appears when the noise reduction is set to ON. 
.Auto notch filter (p. 53) 
. Push [A/NOTCH] to turn the auto or manual 
notch filter ON and OFF. 
.Rotate [NOTCH] control to set the attenuating frequency 
for manual notch operation. 
. VSC (voice squelch control) (p. 54) 
. While M2 is selected with [MENU], push 
[F5 VSC] to turn the VSC function ON and OFF. 
.The VSC indicator appears when the voice squelch 
function is set to ON. 
.Transmit quality monitor (p. 57) 
. Push [MONITOR] to turn the monitor function ON 
and OFF. 
.¡°MONI¡± appears when the monitor function is set to 
ON. 
. Audio tone control (p. 89) 
. While M2 is selected with [MENU], push [F4 
TCN], select an item with [F1 ¡Â] and [F2 ¡Ã] then 
rotate the tuning dial to adjust the audio tone.
(Unit: Hz) 
254.1 
DTone squelch operation 
Tone squelch operation is a method of communications 
using selective calling. Only received signals having 
a matching tone will open the squelch. Before 
communicating using tone squelch, all members of 
your party must agree on the tone squelch frequency 
to use. 
q Push [AM/FM] to select FM mode. 
w Push [MENU] several times to select M1. 
e Push [F4 TON] several times to turn the tone 
squelch function ON. 
• “TSQL” appears 
r Push [F4 TONE] for 1 sec. to enter tone frequency 
set mode. 
t Push [F1 TON] several times until TSQL Tone 
appears, if necessary. 
y Rotate the tuning dial to select the desired tone 
squelch frequency. 
• Push [F3] for 1 sec. to select the default frequency. 
u Push [MENU] to return to M1. 
i Communicate in the usual manner. 
•Available tone squelch frequencies 
165.5 
167.9 
171.3 
173.8 
177.3 
179.9 
183.5 
136.5 
141.3 
146.2 
151.4 
156.7 
159.8 
162.2 
107.2 
110.9 
114.8 
118.8 
123.0 
127.3 
131.8 
085.4 
088.5 
091.5 
094.8 
097.4 
100.0 
103.5 
67.0 
69.3 
71.9 
74.4 
77.0 
79.7 
82.5 
210.7 
218.1 
225.7 
229.1 
233.6 
241.8 
250.3 
186.2 
189.9 
192.8 
196.6 
199.5 
203.5 
206.5 
RECEIVE AND TRANSMIT 4 
AGC DUP CMP TON SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] for 1 sec. 
TSQL Tone 
TON SCN 88.5Hz 
F 5 F 4 F 3 F 2 F 1 
42
4 RECEIVE AND TRANSMIT 
DDTCS operation 
DTCS function is an another method of communications 
using selective calling. Only received signals having 
a matching 3-digit code will open the squelch. 
q Push [AM/FM] to select FM mode. 
w Push [MENU] several times to select M1. 
e Push [F4 TON] several times to turn the DTCS 
function ON. 
• “DTCS” appears 
r Push [F4 TON] for 1 sec. to enter tone frequency 
set mode. 
t Push [F1 TON] several times until DTCS Code 
appears, if necessary. 
y Rotate the tuning dial to select the desired DTCS 
code number and push [F5] to select the desired 
code polarity. 
NN : Normal polarity is used for both transmit and 
NR : Normal polarity is used for transmit, reversed 
RN : Reversed polarity is used for transmit, normal 
RR : Reversed polarity is used for both transmit 
receive. 
polarity is used for receive. 
polarity is used for receive. 
and receive. 
• Push [F3] for 1 sec. to select the default code and polarity. 
u Push [MENU] to return to M1. 
i Communicate in the usual manner. 
•Available tone codes 
244 
245 
246 
251 
252 
255 
261 
263 
265 
266 
271 
274 
306 
152 
155 
156 
162 
165 
172 
174 
205 
212 
223 
225 
226 
243 
072 
073 
074 
114 
115 
116 
122 
125 
131 
132 
134 
143 
145 
023 
025 
026 
031 
032 
036 
043 
047 
051 
053 
054 
065 
071 
43 
AGC DUP CMP TON SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] for 1 sec. 
DTCS Code 
TON SCN O23-NN 
F 5 F 4 F 3 F 2 F 1 
Select a code with the tuning dial. 
Push [F5] to select the polarity 
631 
632 
654 
662 
664 
703 
712 
723 
731 
732 
734 
743 
754 
466 
503 
506 
516 
523 
526 
532 
546 
565 
606 
612 
624 
627 
412 
413 
423 
431 
432 
445 
446 
452 
454 
455 
462 
464 
465 
311 
315 
325 
331 
332 
343 
346 
351 
356 
364 
365 
371 
411
Repeater operation 
A repeater amplifies received signals and retransmits 
them at a different frequency. When using a repeater, 
the transmit frequency is shifted from the receive frequency 
by an offset frequency. A repeater can be accessed 
using split frequency operation with the shift 
frequency set to the repeater’s offset frequency. 
q Push a band key to select the desired band. 
w Push [A/B] to select VFO A. 
e Push [AM/FM] to select FM. 
• Pushing [AM/FM] toggles between AM and FM. 
r Rotate the tuning dial to set the repeater transmit 
frequency. 
t While M1 is selected, push [F2 DUP] several times 
to set the offset direction. 
• “DUP–” or “DUP+” appears 
•0.100 MHz for HF, 0.500 MHz for 50 MHz and 
0.600 MHz for 144 MHz band is set by default in set 
mode. (p. 83) 
y Push [F4 TON] to turn the repeater tone ON. 
• “T” appears. 
• Set the tone frequency in tone frequency set mode in 
advance, if desired. (p. 45) 88.5 Hz is set by default. 
To transmit a 1750 Hz European repeater tone, 
push [F4 TON] while transmitting. 
u Communicate in the normal way. 
DOne-touch repeater function 
This function allows you to set repeater operation with 
push of one switch. 
.To set the transceiver for repeater operation using 
the one-touch repeater function, follow the steps q 
to r as above, then push [F2 DUP] for 1 sec. 
Set the offset shift direction and frequency in advance 
(p. 83) as well as the tone frequency (see 
p. 45). 
AGC DUP CMP TON SCP 
F 2 F 1 F 5 F 4 F 3 
Push [F2], [F4] 
145.O8OOO 
AGC DUP CMP TON SCP 
F 2 F 1 F 5 F 4 F 3 
Appears 
AGC DUP CMP TON SCP 
F 2 F 1 F 5 F 4 F 3 
Push [F2] for 1 sec. 
145.O8OOO 
AGC DUP CMP TON SCP 
F 2 F 1 F 5 F 4 F 3 
Appears 
RECEIVE AND TRANSMIT 4 
44
4 RECEIVE AND TRANSMIT 
DTransmit frequency monitor check 
You may be able to receive the other party’s transmit 
signal directly without having to go through a repeater. 
This function allows you to check this. 
.While receiving, push and hold [XFC] to see if you 
can receive the other party’s transmit signal directly. 
• While holding [XFC], the offset direction and frequency 
are displayed on the multi-function switch indicator. 
DRepeater tone frequencies 
The transceiver’s repeater tone frequency is set to 
88.5 Hz by default. This can be changed if desired. 
q While M1 is selected, push [F4 TON] to turn the 
tone encoder ON. 
• “T” appears. 
w Push [F4 TON] for 1 sec. to select the tone frequency 
set mode. 
e Push [F1 TON] several times to select Rptr 
Tone, if necessary. 
r Rotate the tuning dial to select the desired frequency. 
(see the table at right) 
t Push [MENU] to return to M1. 
DStoring a non standard repeater 
q Turn the auto repeater function OFF in the set 
mode. (p. 84) 
w Push [AM/FM] to select FM mode. 
e Push [V/M], then [A/B] to select VFO A. 
r Rotate the tuning dial to set the repeater output frequency. 
• Set the tuning step if desired. 
t Push [A/B] to select VFO B. 
y Rotate the tuning dial to set the repeater input frequency. 
u Push [A/B] to select VFO A. 
i Push [SPLIT] to turn the split function ON. 
o Push [F4 TON] to turn the previously set tone encoder 
ON. 
!0 Rotate [M-CH] to select the desired memory channel. 
• “BLANK” appears when a blank channel is selected. 
!1 Push [MW] for 1 sec. to store the contents in the selected 
memory channel. 
45 
[XFC] 
-6OO.Ok 
AGC DUP CMP TON SCP 
67.0 
69.3 
71.9 
74.4 
77.0 
79.7 
82.5 
Rptr Tone 
TON SCN 88.5Hz 
(Unit: Hz) •Available tone frequencies 
254.1 210.7 
218.1 
225.7 
229.1 
233.6 
241.8 
250.3 
186.2 
189.9 
192.8 
196.6 
199.5 
203.5 
206.5 
165.5 
167.9 
171.3 
173.8 
177.3 
179.9 
183.5 
136.5 
141.3 
146.2 
151.4 
156.7 
159.8 
162.2 
107.2 
110.9 
114.8 
118.8 
123.0 
127.3 
131.8 
085.4 
088.5 
091.5 
094.8 
097.4 
100.0 
103.5 
[MW] 
[V/M] 
[AM/FM] [SPLIT] [A/B] [M-CH]
RECEIVE AND TRANSMIT 4 
Auto Repeater 
ON-1 18
Auto Repeater 
ON-2 18
Auto Repeater 
18 OFF 
minus duplex 
minus duplex 
DAuto repeater function 
This function automatically activates the repeater settings 
(DUP– or DUP+ and/or tone encoder ON/OFF) 
when the operating frequency falls within the general 
repeater output frequency range and deactivates them 
when outside of the range. 
Set the auto repeater function ON-1 or ON-2 in set 
mode in advance (p. 84). When set ON-1 or ON-2, repeater 
settings are automatically activated according 
to the table below. 
ON-1 automatically sets the duplex setting and ON-2 
automatically sets the duplex setting and tone encoder 
automatically. 
• Frequency range and offset direction 
DUPLEX DIRECTION FREQUENCY RANGE 
145.200–145.495 MHz 
146.610–146.995 MHz 
147.000–147.395 MHz plus duplex 
46
While the band scope is “sweeping,” “ ” appears; while stopped “ ” appears. Received 
audio is not emitted from the speaker while the band scope is “sweeping.” 
Indicates the relative strength of signals and their location in relation to the center (displayed) 
Band scope in- frequency. Signal strength is relative to the S-meter level, S1 to S9, with each vertical dot in the 
band scope indicator equal to one segment of the S-meter. Signal activity is measured ±30 
steps from the center frequency with each step equal to the selected sweep step. 
After a sweep, indicates the relative position of the selected frequency. When the selected frequency 
is outside of the sweep range, “ ” or “ ” indicator flashes. After changing the frequency, 
push [F3] for 1 sec. to automatically return to the center frequency. 
Indicates the selected sweep step. 0.5, 1, 2, 5, 10, 20 and 25 kHz are selectable. Each dot of 
the band scope indication is approx. equal to the selected sweep step. 
STEP 
0.5k 
5 FUNCTIONS FOR RECEIVE 
 Simple band scope 
The band scope function allows you to visually check 
signal conditions around a specified frequency. The IC- 
746PRO’s band scope function can be used in any operating 
mode and frequency band. 
INDICATOR 
Sweep 
dicator 
Frequency 
indicator mark 
Sweep step 
The band scope measures receive signal conditions 
over a specified range on either side of a selected frequency 
in either VFO or memory modes. 
q Rotate the tuning dial to tune a frequency. 
w While M1 is selected, push [F5 SCP] to select the 
band scope menu. 
• Starts sweeping automatically with the previously selected 
sweeping step. 
• During sweep, received signals cannot be heard. 
e Push [F5 STEP] several times to select the desired 
sweep step. 
r Push [F1] to start sweeping, then stop automatically 
after sweeping. 
• Push [F1] for 1 sec. to start continuous sweeping. In this 
case, it is necessary to push [F1] to stop sweeping. 
•During sweep operation “ ” appears and received 
signals cannot be heard. 
• If there is a lot of signal noise, turn the preamp OFF and 
the attenuator ON to reduce the signal input level and 
improve the readability of the band scope. 
t When rotating the tuning dial and you finding a signal 
you wish to communicate on, then just communicate 
in the normal way. 
• If you want to return to the previous frequency (before 
rotating the tuning dial), push [F3] for 1 sec. 
• If the selected frequency is set outside of the sweeped 
range, “ ” or “ ” flashes. 
y While receiving, if you want to update the band conditions, 
repeat steps e and r as above. 
Sweep indicator 
Band scope indicator 
Frequency indicator mark 
Sweep step indicator 
DESCRIPTION 
Sweep start/stop 
Sweep indicator 
47 
F 4 F 3 F 2 F 1 
STEP 
O.5k 
F 5 
Sweep step selection 
STEP 
O.5k 
F 5 F 4 F 3 F 2 F 1
 Preamp/Attenuator 
The preamp amplifies received signals in the front end 
circuit to improve the S/N ratio and sensitivity. Set this 
to preamp 1 or preamp 2 when receiving weak signals. 
The attenuator prevents a desired signal from distortion 
when very strong signals are near the desired frequency 
or when very strong electric fields, such as 
from broadcasting stations, are near your location. 
These can both set independently for each band. 
.Push [P.AMP/ATT] several times to set the preamp 
OFF, preamp 1 ON or preamp 2 ON. 
.When the preamp is ON, either ¡°P.AMP 1¡± or 
¡°P.AMP 2¡± appears in the function display. 
. When operating on the 144 MHz band, the preamp can 
only be set to ON or OFF only. there is no preamp 1 
and preamp 2. 
Regular preamp, the most effective for 1.8 to 
21 MHz bands without IMD corruption. 
High-gain preamp, the most effective for 24 
to 50 MHz bands. 
Preamp activates for the VHF band (144 to 
146 MHz range; 108 to 174 for the USA version). 
.Push [P.AMP/ATT] for 1 sec. to set the attenuator ON. 
. ¡°ATT¡± appears in the display when the function is set ON. 
.Push [P.AMP/ATT] momentarily to set the attenuator OFF. 
Regarding the use of the ¡°P.AMP 2¡± 
The ¡°P.AMP 2¡± is a high gain receive amplifier. When the 
¡°P.AMP 2¡± is used during times of strong electric fields, distortion 
sometimes results. In such cases, use the transceiver 
with the ¡°P.AMP 1¡± or ¡°P.AMP OFF¡± setting. 
RIT function 
The RIT (Receive Increment Tuning) function compensates 
for off-frequencies of the communicating station. 
The function shifts the receive frequency up to 
¡¾9.99 kHz in 10 Hz steps without moving the transmit 
frequency. 
.See #0 on p. 4 for function description. 
q Push [RIT] to turn the RIT function ON and OFF. 
. ¡°RIT¡± and the shifting frequency appear when the function 
is ON. 
w Rotate the [RIT/¡ÓTX] control. 
. Push [CLEAR] for 1 sec. to reset the RIT frequency. 
. Push [CLEAR] momentarily to reset the RIT frequency 
when the quick RIT clear function is ON. (p. 86) 
. Push [RIT] for 1 sec. to add the shift frequency to the operating 
frequency. 
DRIT monitor function 
When the RIT function is ON, pushing and holding 
[XFC] allows you to monitor the operating frequency 
directly (RIT is temporarily cancelled). 
FUNCTIONS FOR RECEIVE 5 
[P.AMP/ATT] 
Push Push 
P.AMP/ATT P.AMP/ATT 
Push
P.AMP/ATT 
Push for 1sec. Push 
P.AMP/ATT P.AMP/ATT 
The ¡°P.AMP 2¡± is most effective when: 
.Used on bands above 24 MHz and when electric fields are 
weak. 
. Receive sensitivity is insufficient during low gain, or while 
using a narrow band antenna (such as small loop, a Beverage 
antenna or a short Yagi antenna, etc.) is used.
[CLEAR] 
[RIT] [RIT/¡ÓTX] control 
Appears 
48
5 FUNCTIONS FOR RECEIVE 
[F1 AGC] Mode switches 
: Medium AGC speed 
: Slow AGC speed 
: Fast AGC speed 
: AGC is not activated 
(unit: sec.) 
AGC DUP CMP TBW SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F1] for 1 sec. 
F 5 F 2 F 3 F 4 F 1 
Appears under the selected AGC Selected mode 
speed’s time constant indication. 
• When AGC fast is selected 
F 5 F 4 F 3 F 2 F 1 
Push [F2] for 1 sec. to select the default value in 
this case. 
 AGC function 
The AGC (auto gain control) controls receiver gain to 
produce a constant audio output level even when the 
received signal strength is varied by fading, etc. 
The transceiver has 3 AGC characteristics (time constant; 
fast, mid, slow) for non-FM modes. 
The FM mode AGC time constant is fixed as ‘FAST’ 
(0.1 sec.) and AGC time constant cannot be selected. 
DAGC speed selection 
q Select a non-FM mode. 
w While M1 is selected, push [F1 AGC] several times 
to select AGC F, AGC M, AGC S or AGC OFF. 
“AGC OFF” appears when AGC time constant OFF 
is set with one of FAST, MID or SLOW setting in 
AGC set mode. 
DSetting the AGC time constant 
q Select the desired mode other than FM mode. 
w While M1 is selected, push [F1 AGC] for 1 sec. to 
enter AGC set mode. 
e Push one of [F2 FAST], [F3 MID] or [F4 SLOW] to select 
the desired AGC speed to be set. 
•An underline appears below the time constant indication. 
r Rotate the tuning dial to set the desired time constant. 
• AGC time constant can be set between 0.1 to 8.0 sec. 
(depends on mode) or turned OFF. 
•Push [F2 FAST], [F3 MID] or [F4 SLOW] for 1 sec. to select 
a default value each for fast, mid. and slow, respectively. 
t Select another mode other than FM. Repeat steps 
e and r if desired. 
y Push [MENU] to exit the AGC set mode. 
• Selectable AGC time constant 
Selectable AGC time constant Mode Default 
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6 
2.0, 2.5, 3.0, 4.0, 5.0, 6.0 
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6 
2.0, 2.5, 3.0, 4.0, 5.0, 6.0 
OFF, 0.1, 0.2, 0.3, 0.5, 0.8, 1.2, 1.6 
2.0, 2.5, 3.0, 4.0, 5.0, 6.0 
OFF, 0.3, 0.5, 0.8, 1.2, 1.6, 2.0, 2.5 
3.0, 4.0, 5.0, 6.0, 7.0, 8.0 
0.3 (FAST) 
SSB 2.0 (MID) 
6.0 (SLOW) 
0.1 (FAST) 
CW 0.5 (MID) 
1.2 (SLOW) 
0.1 (FAST) 
RTTY 0.5 (MID) 
1.2 (SLOW) 
3.0 (FAST) 
AM 5.0 (MID) 
7.0 (SLOW) 
FM 0.1 (FAST) Fixed 
49
 IF filter selection 
The transceiver has 3 passband width IF filters for 
each mode. 
For SSB and CW modes, the passband width can be 
set within 50 to 3600 Hz in 50 or 100 Hz steps. A total 
of 41 passband widths are available. 
For RTTY mode, the passband width can be set within 
50 to 2700 Hz in 50 or 100 Hz steps. A total of 32 
passband widths are available. 
For AM and FM modes, the passband width is fixed 
and 3 passband widths are available independently. 
The filter selection is automatically memorized in 
each mode. 
The PBT shift frequencies are automatically memorized 
in each filter. 
DIF filter selection 
q Select the desired mode. 
w For RTTY mode, turn OFF the RTTY filter. 
e Push [FILTER] several times to select the IF filter 
1, 2 or 3. 
• The selected passband width and filter number is displayed 
in the LCD. 
By pushing [PBTC], the set filter passband width, 
“B,” and shifting value “S” is indicated. 
DFilter passband width setting (SSB, CW and RTTY mode only) 
q Select SSB, CW or RTTY mode. 
• Passband widths for AM and FM modes are fixed and 
cannot be set. 
w For RTTY mode, turn OFF the RTTY filter. 
e Push [FILTER] for 1 sec. to enter filter set mode. 
r Push [FILTER] several times to select the desired 
IF filter number. 
t While pushing [F1 BW], rotate the tuning dial to set 
the desired passband width. 
•In SSB and CW modes, the passband width can be set 
50 Hz steps 
100 Hz steps 
50 Hz steps 
100 Hz steps 
within the following range. 
50 to 500 Hz 
600 to 3600 Hz 
• In RTTY mode, the passband width can be set within the 
following range. 
50 to 500 Hz 
600 to 2700 Hz 
• Push [F-3] for 1 sec. to select the default value. 
y Repeat steps r to t if desired. 
u Push [MENU] to exit the filter set mode. 
The PBT shift frequencies are cleared when the 
passband width is changed. 
This filter set mode screen graphically displays the 
PBT shift frequencies and CW pitch operations. 
• Filter set mode indication 
BW 
Shows the selected filter and passband width. 
• Indication while setting 
BW 
While pushing [F1 BW], rotate the tuning dial to set 
passband width. 
FUNCTIONS FOR RECEIVE 5 
[FILTER] 
AGC DUP CMP TBW SCP 
The selected filter width is indicated 
for approx. 1 sec. when [FILTER] is 
pushed. Filter selection 
Appears Reverses 
50
5 FUNCTIONS FOR RECEIVE 
 IF (DSP) filter shape 
The type of IF (DSP) filter shape for SSB and CW can 
be selected independently from soft and sharp. 
q Push [SSB] or [CW/RTTY] to select SSB, CW or 
RTTY mode. 
w Select the filter set mode. 
• Push [FILTER] for 1 sec. 
• Operating mode can be selected in this step. 
e Push [FILTER] several times to select the desired 
IF filter. 
r Push the [F5] to select the filter shape from “SOFT” 
and “SHARP.” 
t Push [MENU] to exit the set mode. 
Noise blanker 
The noise blanker eliminates pulse-type noise such as 
from car ignitions. The noise blanker is not available 
for FM mode. 
q Push [NB] to turn the noise blanker ON. 
• [NB] indicator appears. 
w Push [NB] for 1 sec. to enter the NB level set mode. 
e Rotate the tuning dial to adjust the noise blanker 
level. 
• Noise blanker level is indicated with bar meter and digit 
in ‘%.’ 
r Push [NB] to exit the noise blanker set mode. 
t Push [NB] to turn the noise blanker OFF. 
• [NB] indicator disappears. 
When using the noise blanker, received signals may 
be distorted if the noise blanker level setting has 
been too high. 
Meter peak hold function 
The S-meter has a peak level holding function. The 
peak level of the received signal strength is indicated 
for 0.5 sec. (approx.). This function can be deactivated 
in set mode if desired. (p. 82) 
51 
BW 
Push [F5] 
[NB] 
BW 
“NB” appears while noise blanker is activated. 
5O% 
NB Level 
Shows noise blanker level 
Meter Peak Hold 
ON 9 
Shows peak level for approx. 0.5 sec.
Twin PBT operation 
General PBT (Passband Tuning) function electronically 
narrows the IF passband width by shifting the IF frequency 
to slightly outside of the IF filter passband to 
reject interference. This transceiver uses the DSP circuit 
for the PBT function. Moving both [TWIN PBT] 
controls to the same position shifts the IF. 
. The LCD shows the passband width and shift frequency 
graphically. 
. Push [FILTER] for 1 sec. to enter the filter set mode. 
Current passband width and shift frequency is displayed 
in the filter set mode screen. 
. To set the [TWIN PBT] controls to the center positions, 
push [PBTC] for 1 sec. 
The variable range depends on the passband width 
and mode. The edge of the variable range is half of the 
passband width, and PBT is adjustable in 25 or 50 Hz 
steps. These controls function as an IF shift control 
while in AM mode and when the RTTY filter is turned 
ON. Only the inner control may function in this case. 
IF shift is adjustable in 20/40 Hz steps in RTTY (RTTY 
filter is turned ON) or 150/300/500 Hz steps in AM. 
• [TWIN PBT] should normally be set to the center positions 
(PBT setting is cleared) when there is no interference. 
NOTE: In the “center” PBT position on CW, it it normal 
for the graphic display’s center line to be slightly to the 
left side of PBT envelope, if a CW filter selection of 
800 Hz or above is selected. 
•When PBT is used, the audio tone may be changed. 
• Not available for FM mode. 
•For AM and RTTY (with RTTY filter ON) modes, 
[TWIN PBT] inner control only can be activated, and 
functions as an IF shift function. 
• While rotating [TWIN PBT], noise may occur. This comes 
from the DSP unit and does not indicate an equipment 
malfunction. 
• By pushing [PBTC] momentarily indicates the passband 
width, “B,” and shifting value, “S” of the filter being used. 
PBT OPERATION EXAMPLE 
Center 
IF center frequency interference 
Passband 
pass band 
desired signal inteference 
FUNCTIONS FOR RECEIVE 5 
[TWIN PBT] control 
[PBTC] 
BW 
Shows the selected filter and passband width. 
• Indication while PBT setting 
AGC DUP CMP TBW SCP 
Passband width and shifting value are 
indicated while [TWIN PBT] is operated. 
Appears when PBT is used. 
• Filter set mode indication 
IF shift 
IF center freq. interference 
BW 
Appears when passband is shifted. 
*By pushing [PBTC] for 1 sec., the shifted value returns 
to the default setting, and the “dot” disappears. 
Passband 
desired signal 
52
5 FUNCTIONS FOR RECEIVE 
 Noise reduction 
The noise reduction function reduces noise components 
and picks out desired signals which are buried 
in noise. The received signals are converted to digital 
signals and then the desired signals are separated 
from the noise. 
q Push the [NR] switch to turn the noise reduction 
ON. 
• “NR” appears. 
w Rotate the [NR] control to adjust the noise reduction 
level. 
e Push the [NR] switch to turn the noise reduction 
OFF. 
• “NR” disappears. 
Deep rotation of the [NR] control results in audio signal 
masking or distortion. Set the [NR] control for 
maximum readability. 
 Notch function 
This transceiver has auto and manual notch functions. 
The auto notch function automatically attenuates more 
than 3 beat tones, tuning signals, etc., even if they are 
moving. The manual notch can be set to attenuate a 
frequency via the [NOTCH] control. 
.Push [A/NOTCH] to turn the manual notch function 
.Push [A/NOTCH] to toggle the notch function between 
auto, manual and OFF in SSB and AM 
modes. 
ON and OFF in CW mode. 
.Push [A/NOTCH] to turn the auto notch function ON 
and OFF in FM mode. 
• Set to attenuate a frequency for manual notch via the 
[NOTCH] control. 
• “ANOTCH” appears when auto notch is in use. 
• “NOTCH” appears when manual notch is in use. 
While operating the manual notch, noise may be 
heard. This comes from the DSP unit and does not 
indicate an equipment malfunction. 
 Dial lock function 
The dial lock function prevents accidental changes 
caused by the tuning dial. 
. Push [LOCK/SPCH] to turn the dial lock function ON 
and OFF. 
• “LOCK” indicator lights while the dial lock function is activated. 
53 
[NR] [NR] 
AGC DUP CMP TBW SCP 
Appears 
[A/NOTCH] [NOTCH] 
AGC DUP CMP TBW SCP 
Notch function indicators 
Lights while the dial lock function is activated. 
[LOCK/SPCH]
 Voice squelch control function 
This function is useful when you don’t want unmodulated 
signals. When the voice squelch control function 
is activated, the receiver checks received signals for 
voice components. 
If a receiver signal includes voice components, and the 
tone of the voice components changes within 1 sec., 
squelch opens. If the received signal includes no voice 
components or the tone of the voice components does 
not change within 1 sec., squelch closes. 
.While M2 is selected with [MENU], push [F5 VSC] 
to switch the VSC (Voice Squelch Control) function 
ON and OFF. 
• “VSC” appears when the function is activated. 
•The VSC function activates for phone modes 
(SSB, AM and FM). 
• The VSC function can also be used for scanning 
operation in AM or FM mode (p. 70). 
FUNCTIONS FOR RECEIVE 5 
VSC indicator 
SCN MEM SWR TCN VSC 
F 5 F 4 F 3 F 2 F 1 
Push [F5] to turn the VSC function ON and OFF. 
54
6 FUNCTIONS FOR TRANSMIT 
 VOX function 
The VOX (Voice-Operated Transmission) function 
switches between transmit and receive with your voice. 
This function provides an opportunity to input log entries 
into your computer, etc., while operating. 
.Using the VOX function 
q Select a phone mode (SSB, AM, FM). 
w Push [VOX/BK-IN] to turn the VOX function ON or 
OFF. 
DAdjusting the VOX function 
q Select a phone mode (SSB, AM, FM). 
w Push [VOX/BK-IN] to turn VOX function ON. 
e Push [VOX/BK-IN] for 1 sec. to enter VOX set 
mode. 
r Select the VOX Gain item using [F1 ¡Â] or [F2 ¡Ã]. 
t While speaking into the microphone, rotate the tuning 
dial to the point where the transceiver is continuously 
transmitting. 
- Push [F3] for 1 sec. to select the default value. 
y Push [F2 ¡Ã] to select Anti-VOX item. 
u While receiving, rotate the tuning dial to the point 
where the transceiver does not switch to transmit 
with the speaker output. 
- Push [F3] for 1 sec. to select the default value. 
i Push [F2 ¡Ã] to select VOX Delay item. 
o Adjust the VOX delay for a convenient interval before 
returning to receive. 
- Select the VOX delay item using the tuning dial. 
- Push [F3] to select the default value. 
!0 Push [MENU] to return to previous indication. 
AGC DUP CMP TBW SCP 
Appears 
F 1 
F 1 
F 1 
F 4 
F 4 
F 4 
55 
[VOX/BK-IN] 
VOX Gain 
1 
F 3 F 2 
Shows VOX gain level 
Anti-VOX 
2 
F 3 F 2 
Shows anti-VOX gain level 
VOX Delay 
3 
F 3 F 2 
Shows VOX delay time 
5O% 
F 5 
5O% 
F 5 
O.2s 
F 5
 Break-in function 
The break-in function is used in CW mode to automatically 
toggle the transceiver between transmit and receive 
when keying. The IC-746PRO is capable for full 
break-in or semi break-in. 
DSemi break-in operation 
During semi break-in operation, the transceiver selects 
transmit when keying, then automatically returns to receive 
after a pre-set time from when you stop keying. 
q Push [CW/RTTY] to select CW or CW-R mode. 
w Push [VOX/BK-IN] several times to turn the semi 
break-in function ON. 
• “BK-IN” appears. 
e Set the break-in delay time (the delay from transmit 
to receive). 
.Push [VOX/BK-IN] for 1 sec. to select break-in 
delay program mode. 
.Rotate the tuning dial to select the desired delay. 
• Push [F3] for 1 sec. to select to the default value. 
r Push [MENU] to return to the previous menu. 
When using a paddle, rotate [KEY SPEED] to adjust 
the keying speed. 
DFull break-in operation 
During full break-in operation, the transceiver automatically 
selects transmit while keying and returns to receive 
immediately after keying is finished. 
q Push [CW/RTTY] to select CW or CW-R mode. 
w Push [VOX/BK-IN] several times to turn the full 
break-in function ON. 
• “FBK-IN” appears. 
When using a paddle, rotate [KEY SPEED] to adjust 
the keying speed. 
FUNCTIONS FOR TRANSMIT 
[VOX/BK-IN] 
Break-IN Delay 
7.5d 
Break-in indicator 
Shows break-in delay time 
AGC DUP 1/4 KEY SCP 
Full break-in indicator 
6 
56
6 FUNCTIONS FOR TRANSMIT 
 �İTX function 
The �İTX function shifts the transmit frequency up to 
�}9.99 kHz in 10 Hz steps without moving the receive 
frequency. 
.See #2 on p. 4 for function description. 
q Push the [�İTX] switch to turn the �İTX function ON 
and OFF. 
. �g�İTX�h and shift frequency appear when the function is 
ON. 
w Rotate the [RIT/�İTX] control. 
.To reset the �İTX frequency, push [CLEAR] for 1 sec. 
. Push [CLEAR] momentarily to reset the �İTX frequency 
when the quick RIT clear function is ON. (p. 86) 
.To add or subtract the �İTX frequency to the displayed 
frequency, push [�İTX] for 1 sec. 
When RIT and �İTX are ON at the same time, the 
[RIT/�İTX] control shifts both the transmit and receive 
frequencies from the displayed frequency at 
the same time. 
D�İTX monitor function 
When the �İTX function is ON, pushing and holding 
[XFC] allows you to monitor the operating frequency directly 
(�İTX is temporarily cancelled). 
 Monitor function 
The monitor function allows you to monitor your transmit 
IF signals in any mode through the speaker. Use 
this to check voice characteristics while adjusting SSB 
transmit tones. (p. 89) The CW sidetone functions regardless 
of the [MONITOR] switch setting. 
q Push [MONITOR] to switch the monitor function ON 
and OFF. 
. �gMONI�h appears when the monitor function is ON. 
w Set the monitor level. 
.Push [MONITOR] for 1 sec. to select monitor program 
mode. 
.Rotate the tuning dial for the clearest audio output 
while pushing [PTT] and speaking into the microphone. 
. Push [F3] for 1 sec. to select the default value. 
e Push [MENU] to return to the previous menu. 
57 
[CLEAR] 
[�İTX] [RIT/�İTX] control 
Appears 
[MONITOR] 
MONITOR Level
5O% 
Monitor indicator 
Shows monitor level
 Speech compressor 
The speech compressor increases average RF output 
power, improving signal strength and readability in 
SSB, AM or FM. 
When adjusting the compression level, it is necessary 
to turn the COMP meter ON in the set mode, in advance 
(p. 82). 
•In SSB mode 
q Select USB or LSB mode and adjust [MIC GAIN] to 
a suitable level. 
w While M1 is selected, push [F3 CMP] to turn the 
speech compressor ON. 
• “COMP” appears. 
e Push [F3 CMP] for 1 sec. to select compression 
level set mode. 
r While speaking into the microphone, rotate the tuning 
dial, so that the COMP meter reads within the 
COMP zone with your normal voice level. 
• Push [F3] for 1 sec. to select the default value. 
When the COMP meter peaks above the COMP 
zone, your transmitted voice may be distorted. 
t Push [MENU] to return to M1. 
•In AM/FM mode 
q While M1 is selected, push [F3 CMP] to turn the 
speech compressor ON. 
• “COMP” appears. 
w Push [F3 CMP] for 1 sec. and set the compression 
level as “1” in advance. 
e While speaking into the microphone, rotate [MIC 
GAIN], so that the COMP meter does not exceed 
the center dot whether you speak softly or loudly. 
r While speaking into the microphone, rotate the tuning 
dial, so that the COMP meter reads within the 
COMP zone with your normal voice level. 
• Push [F3] for 1 sec. to select the default value. 
When the COMP meter peaks above the COMP 
zone, your transmitted voice may be distorted. 
t Push [MENU] to return to M1. 
 Transmit filter width selection (SSB mode only) 
The transmit filter width for SSB mode can be selected 
from wide, middle and narrow. 
q Select USB or LSB mode. 
w Push [MENU] to select M1, if necessary. 
e Push [F4 TBW] for 1 sec. to select the transmission 
passband width. 
•One of “TX BW=WIDE,” “TX BW=MID” or “TX 
BW=NAR” is displayed for approx. 1 sec. 
•Transmit filter width: NAR 2.2 kHz 
MID 2.4 kHz 
WIDE 2.8 kHz 
AGC DUP CMP TBW SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] 
TX BW=WIDE 
AGC DUP CMP TBW SCP 
F 5 F 2 F 3 F 4 F 1 
The selected transmit filter width 
is displayed for approx. 1 sec. 
Push [F4] for 1 sec. to select the transmit filter width. 
FUNCTIONS FOR TRANSMIT 6 
5 
COMP Level 
Compressor indicator 
Shows compression level 
ALC meter 
COMP meter 
COMP level zone 
*The SWR meter functions as the COMP meter 
when COMP meter is set to ON in the set mode. 
COMP Level 
1 
Adjust [MIC GAIN], so that the COMP meter does 
not exceed this zone. 
Adjust the COMP Level with the tuning dial so 
that the COMP meter does not exceed the COMP 
level zone. 
58
6 FUNCTIONS FOR TRANSMIT 
 Split frequency operation 
Split frequency operation allows you to transmit and 
receive in the same mode on two different frequencies. 
The split frequency operation is basically performed 
using 2 frequencies in VFO A and VFO B. 
The following is an example of setting 21.290 MHz for 
receiving and 21.310 MHz for transmitting. 
q Set 21.290 MHz (USB) in VFO A. 
w Push [SPLIT] to turn the split function ON, then 
push [A/B] for 1 sec. 
• The equalized transmit (VFO B) frequency and “SPLIT” 
appear on the LCD, and the [SPLIT] indicator lights. 
e While pushing [XFC] rotate the tuning dial to set the 
transmit frequency to 21.310 MHz. 
• The transmit frequency can be monitored while pushing 
[XFC]. 
r Now you can receive on 21.290 MHz and transmit 
on 21.310 MHz. 
To change the transmit and receive frequencies, push 
[A/B] to exchange the VFO A and VFO B. 
CONVENIENT 
• Direct shift frequency input 
The shift frequency can be entered directly. 
q Push [F-INP]. 
w Enter the desired shift frequency with the digit 
keys. 
• 1 kHz to 1 MHz can be set. 
•When you require a minus shift direction, push 
[GENE • ] in advance. 
e Push [SPLIT]. 
• The shift frequency is input in the sub readout and the 
split function is turned ON. 
[Example] 
To transmit on 1 kHz higher frequency: 
- Push [F-INP], [1.8 1] then [SPLIT]. 
To transmit on 3 kHz lower frequency: 
- Push [F-INP], [GENE • ], [7 3] then [SPLIT]. 
• Split lock function 
Accidentally releasing the [XFC] switch while rotating 
the tuning dial changes the receive frequency. To prevent 
this, use both the split lock and dial lock functions 
to change the transmit frequency only. The split 
lock function cancels the dial lock function while 
pushing [XFC] during split frequency operation. 
The dial lock’s effectiveness during split frequency 
operation can be selected in the set mode for both 
receive and transmit frequencies; or only the receive 
frequency. (p. 83) 
59 
[SPLIT] Lights during split operation 
[A/B] [XFC] Tuning dial 
21.29OOO 
AGC DUP CMP TBW SCP 
Appears Shows transmit (VFO B) frequency 
• While pushing [XFC] 
+2O.OOk 
AGC DUP CMP TBW SCP 
Shows shift frequency and direction 
Shows transmit (VFO B) frequency 
• After setting up 
21.31OOO 
AGC DUP CMP TBW SCP
 Quick split function 
When you push the [SPLIT] switch for 1 sec., split frequency 
operation is turned ON, the undisplayed VFO 
is automatically changed according to the plus/minus 
shift frequency programmed in set mode (p. 83) or 
equalized when 0 kHz (default value) is programmed 
as the split shift frequency. Quick split operation is 
turned ON by default but can be turned OFF in set 
mode (p. 83). 
q Suppose you are operating at 21.290 MHz (USB) in 
VFO A. 
w Push [SPLIT] for 1 sec. 
• Split frequency operation is turned ON. 
•The VFO and VFO B are equalized. 
e While pushing [XFC], rotate the tuning dial to set 
the frequency offset between transmit and receive. 
• When [XFC] is released, the receive frequency is indicated. 
DSplit offset frequency setting 
By setting an often-used split frequency offset in advance, 
you can use the quick split function to select split 
operation at the push of one switch. 
Set the split offset frequency in advance in set mode 
(p. 83, item 12). The example at right shows the split 
offset is set to +0.020 MHz. 
.Push [SPLIT] for 1 sec. to activate the quick split 
function. 
• The transmit frequency is offset from the receive frequency 
according to the offset in set mode. 
DSplit lock function 
The split lock function is convenient for changing only 
the transmit frequency. When the split lock function is 
not used, accidentally releasing [XFC] while rotating the 
tuning dial, changes the receive frequency. The split 
lock function is ON by default, but can be turned OFF 
in set mode. 
q While split frequency operation is ON, push 
[LOCK/SPCH] to activate the split lock function. 
w While pushing [XFC], rotate the tuning dial to 
change the transmit frequency. 
• If you accidentally release [XFC] while rotating the tuning 
dial, the receive frequency does NOT change. 
FUNCTIONS FOR TRANSMIT 6 
• Setting the frequency while pushing [XFC] 
+2O.OOk 
AGC DUP CMP TBW SCP 
Shows shift frequency and direction 
SPLIT Offset 
12 +O.O2OMHz 
21.31OOO 
AGC DUP CMP TBW SCP 
Shows transmit frequency for split operation 
SPLIT LOCK 
13 OFF 
[XFC] Tuning dial [LOCK/SPCH] 
60
6 FUNCTIONS FOR TRANSMIT 
AGC DUP 1/4 RTY SCP 
The best match is in this range. 
STEP 
1Ok 
F 5 
Push [F5] to select 
SWR measuring step. 
Push [F1] to start 
measuring. 
Push [F3] to select number of SWR measuring steps. 
SCN MEM SWR TCN VSC 
F 5 F 4 F 3 F 2 F 1 
Push [F3] 
F 2 F 3 F 4 F 1 
. Measuring (after pushing [F1]) 
 Measuring SWR 
The IC-746PRO has a built-in circuit for measuring antenna 
SWR. no external equipment or special adjustments 
are necessary. 
The IC-746PRO can measure SWR in 2 ways. spot 
measurement and plot measurement are available. 
DSpot measurement 
q Push [TUNER] to turn the antenna tuner OFF. 
w Turn the COMP meter OFF. 
.Push [MENU] for 1 sec. to enter set mode. 
.Push [F1 ¡Â] or [F2 ¡Ã] several times to select the 
COMP Meter item. 
.Rotate the tuning dial to set the COMP meter OFF. 
.Push [MENU] to exit set mode. 
e Push [CW/RTTY] several times to select RTTY 
mode. 
r Push [TRANSMIT] or [PTT] on the microphone. 
t Rotate [RF PWR] clockwise past the 12 o¡¯clock position 
for more than 30 W output power (30%). 
y Read the SWR on the SWR meter. 
u Push [TRANSMIT] or release [PTT] to receive. 
The built-in antenna tuner matches the transmitter 
to the antenna when the SWR is lower than 3:1. 
DPlot measurement 
Plot measurement allows you to measure the SWR 
over an entire band. 
q While M2 is selected with [MENU], push [F3 SWR]. 
.SWR graph screen appears. 
w Rotate [RF PWR] clockwise past the 12 o¡¯clock position 
for more than 30 W output power (30%). 
e Set the center frequency for the SWR to be measured. 
r Push [F5] for 1 sec. several times to select the desired 
measuring step from 10, 50, 100 and 500 kHz. 
t Push [F3] several times to select the desired number 
of measuring steps from 3, 5, 7, 9, 11 and 13 
steps. 
y Push [F1] to start the measuring. 
u Push [TRANSMIT] or push and hold [PTT] on the 
microphone to measure the SWR. 
.Frequency marker, ¡°¡ò,¡± appears below SWR graph. 
.RTTY mode is automatically selected. 
i When pushing [TRANSMIT] again or releasing 
[PTT], the frequency marker and frequency indication 
move to the next frequency to be measured. 
o Repeat steps u and i to measure SWR over the 
entire frequency range. 
!0 When the measured SWR is less than 1.5:1, the 
antenna is well matched with the transceiver in the 
measured frequency range. 
STEP 
1Ok 
Frequency marker appears and moves after measurement. 
*When mesurement point/s is/are set outside of the operatable 
frequency band, the frequency marker flashes. 
. 4.0:1 
. 3.0:1 
. 2.0:1 
. 1.5:1 
. 1.0:1 
Typical display SWR varying between 1 and 2, 
full scale up to SWR 4.0:1. 
61
 Memory channels 
The transceiver has 101 memory channels (plus 1 call 
channel). The memory mode is very useful for quickly 
changing to often-used frequencies. 
MEMORY 
CHANNEL 
MEMORY 
CHANNEL 
NUMBER 
1–99 Regular memory 
channels 
P1, P2 
Scan edge 
memory 
channels 
C Call channel Same as regular. 
 Memory channel selection 
DIn VFO mode 
q Push [V/M] to select VFO mode, if necessary, then 
rotate [M-CH] to select a memory channel number. 
• All memory channels including blank channels can be 
selected. 
• “BLANK” appears when no information has been programmed 
into a memory channel. 
w Push [V/M] to select memory mode. 
• “MEMO” and contents of the memory channel appear. 
DIn memory mode 
q Push [V/M] to select memory mode. 
w Rotate [M-CH] to select a memory channel. 
• All memory channels including blank channels can be 
selected. 
• Memory channels can also be selected using the microphone 
[UP]/[DN] keys. 
CAPABILITY 
One frequency and one mode 
in each memory channel. 
One frequency and one mode in 
each memory channel as scan 
edges for programmed scan. 
MEMORY OPERATION 
All 101 memory channels are tuneable which means 
the programmed frequency can be tuned temporarily 
with the tuning dial, etc. in memory mode. 
• During VFO mode 
• During memory mode 
OVERWRITING 
TRANSFER 
TO VFO 
Yes Yes 
Yes Yes 
Yes No 
[V/M] [M-CH] 
Disappears when a channel is programmed. 
7 
CLEAR 
Yes 
No 
No 
62
7 MEMORY OPERATION 
 Programming a memory 
Memory channel programming can be preformed either 
in VFO mode or in memory mode. 
DProgramming in VFO mode 
q Set the desired frequency and operating mode in 
VFO mode. 
w Rotate [M-CH] to select the desired memory channel. 
• “BLANK” appears if the selected memory channel is a 
blank channel (and does not have contents). 
e Push [MW] for 1 sec. to program the displayed frequency 
and operating mode into the memory channel. 
• 3 beeps are emitted when memory programming is successful. 
DProgramming in VFO mode 
q Select the desired memory channel with [M-CH] in 
memory mode. 
• Memory channel contents appear in the display. 
• “BLANK” appears and no frequency readout is displayed 
if the selected memory channel is a blank channel (and 
does not have contents). 
w Set the desired frequency and operating mode in 
memory mode. 
•To program a blank channel, use direct frequency entry 
with the keypad or memo pads, etc. 
e Push [MW] for 1 sec. to program the displayed frequency 
and operating mode into the memory channel. 
• 3 beeps are emitted when memory programming is successful. 
 Memory clearing 
Any unnecessary memory channels can be cleared. 
The cleared memory channels become blank channels. 
q Select memory mode with [V/M]. 
w Select the desired memory channel with [M-CH]. 
e Push [M-CL] for 1 sec. to clear the contents. 
•The programmed frequency and operating mode disappear. 
• 3 beeps are emitted when memory clearing is successful. 
r To clear other memory channels, repeat steps w 
and e. 
63 
[MW] 
[V/M] [M-CH] 
• [EXAMPLE]: Programming 7.088 MHz/LSB 
into memory channel 12. 
AGC DUP CMP TBW SCP 
• [EXAMPLE]: Programming 21.280 MHz/USB 
into memory channel 18. 
AGC DUP CMP TBW SCP 
[M-CL] 
[V/M] [M-CH]
 Selecting the call channel 
By default 145.00000 MHz/FM is programmed into the 
call channel. However, this can be changed to suit 
your operating preference. (see below) 
q Push [CALL] to select the call channel. 
• “C” appears. 
w Push [CALL] again to return to the previous mode. 
 Programming the call channel 
The call channel is programmed in the same way regular 
memory channels are. It’s convenient to program 
a most-often-used frequency into the call channel for 
quick recall. As with memory channels, the call channel 
can also hold split frequencies. 
q Rotate [M-CH] to select the call channel. 
• “C” appears. 
w Select the desired frequency and operating mode 
to program into the call channel. 
e Push [MW] for 1 sec. to program the displayed frequency 
and operating mode into the call channel. 
• 3 beeps are emitted when memory programming is successful. 
IMPORTANT!: When the call channel is selected 
with the [CALL] switch, the frequency CANNOT be 
changed using the tuning dial, band keys or keypad 
input. However, when the call channel is selected 
using [M-CH] in memory mode, the frequency CAN 
be changed. 
MEMORY OPERATION 7 
[CALL] 
AGC DUP CMP TON SCP 
“C” appears 
[MW] 
[V/M] [M-CH] 
AGC DUP CMP TON SCP 
64
7 MEMORY OPERATION 
 Frequency transferring 
The contents of a memory channel (frequency, operating 
mode, etc.) can be transferred to the VFO. 
Frequency transferring can be performed in either VFO 
mode or memory mode. 
DTransferring in VFO mode 
This is useful for transferring programmed contents to 
VFO. 
q Select VFO mode with [V/M]. 
w Select the memory channel to be transferred with 
[M-CH]. 
• “BLANK” appears if the selected memory channel is a 
blank channel. In this case transferring is impossible. 
e Push [V/M] for 1 sec. to transfer the frequency and 
operating mode. 
• 3 beeps are emitted. 
DTransferring in memory mode 
This is useful for transferring frequency and operating 
mode while operating in memory mode. 
When you have changed the frequency or operating 
mode in the selected memory channel: 
•Displayed frequency and mode are transferred. 
•Programmed frequency and mode in the memory 
channel are not transferred, and they remain in the 
memory channel. 
q Select the memory channel to be transferred with 
[M-CH] in memory mode. 
• And, set the frequency or operating mode if required. 
w Push [V/M] for 1 sec. to transfer the frequency and 
operating mode. 
• 3 beeps are emitted when the transferring is successful. 
• Displayed frequency and operating mode are transferred 
to the VFO. 
e To return to VFO mode, push [V/M] momentarily. 
65 
[V/M] [M-CH] 
TRANSFERRING EXAMPLE IN VFO MODE 
Operating frequency : 21.320 MHz/USB (VFO) 
Contents of M-ch 16 : 14.018 MHz/CW 
Push [V/M] for 1 sec. 
TRANSFERRING EXAMPLE IN MEMORY MODE 
Operating frequency : 14.020 MHz/CW (M-ch 16) 
Contents of M-ch 16 : 14.018 MHz/CW 
Set the frequency 
Push [V/M] for 1 sec. 
then push [V/M]
 Programming scan edges 
Memory channels P1 and P2 are the program scan 
edges. They are used to program an upper and lower 
frequency for programmed scan (p. 71). By default, P1 
is programmed with 0.50000 MHz and P2 is programmed 
with 29.99999 MHz. If P1 and P2 are programmed 
with the same frequencies, programmed 
scan will not proceed. 
[EXAMPLE]: Programming 14.00000 MHz into P1 
and 14.35000 MHz into P2. 
q Push [V/M] to select VFO mode, if necessary. 
w Rotate [M-CH] to select scan edge P1. 
e Rotate the tuning dial to set 14.00000 MHz as the 
lower frequency. 
r Push [MW] for 1 sec. to program 14.00000 MHz 
into scan edge P1. 
• 3 beeps are emitted. 
t Rotate [M-CH] to select scan edge P2. 
y Rotate the tuning dial to set 14.35000 MHz as the 
upper frequency. 
u Push [MW] for 1 sec. to program 14.35000 MHz 
into scan edge P2. 
• 3 beeps are emitted. 
•When programmed scan is activated (p. 71) scanning 
will search the frequencies between 14.00000 MHz and 
14.35000 MHz for signals. 
MEMORY OPERATION 7 
[V/M] [MW] 
Tuning dial [M-CH] 
• After steps w to r 
• After steps t to u 
66
7 MEMORY OPERATION 
 Assigning memory names 
All memory channels (including scan edges) can be 
tagged with alphanumeric names of up to 9 characters 
each. 
[EXAMPLE]: Programming “DX spot” into memory 
channel 99. 
q Push [V/M] to select memory mode, if necessary. 
w Rotate [M-CH] to select memory channel 99. 
e Push [MENU] several times to select M2. 
r Push [F2 MEM] to select the memory name screen. 
t Push [F1 EDT] to edit memory channel name. 
•A cursor appears and blinks. 
•Memory channel names of blank channels cannot be 
edited. 
y Push [F1] several times to select the type of characters 
for input. 
• “ABC” inputs capital letters A to Z. 
• “abc” inputs small letters a to z. 
• “etc” is used to input other characters— ! # $ % & ¥ ? ” 
’ ` ^ + – . / . , : ; = < > ( ) [ ] { } | _ – are available. 
• Use the keypad to directly input numerals, “0” to “9,” including 
a decimal point. 
u Rotate the tuning dial to select the first character for 
input. 
i Push [F2 ç] or [F3 å] to move the cursor forwards 
or backwards, respectively. 
•Push [F5 SPC] to input a space and [F4 DEL] to delete 
the selected character. 
o Repeat steps w to i to program another memory 
channel’s name, if desired. 
!0 Push [MENU] to set the memory channel name and 
return to the memory name menu. 
• Push [MENU] 1 more times to return to M2. 
67 
[MENU] 
SCN MEM SWR TCN VSC 
F 2 F 1 
Push [F2 MEM] 
F 5 F 4 F 3 
14.195OO USB 
EDT ( ) SEL 
F 2 F 3 F 4 F 1 
Push [F2 MEM] 
F 5 
ABC DEL SPC 
F 2 F 3 F 4 F 1 
• During assigning a memory name 
F 5 
DX 
ABC DEL SPC 
F 2 F 3 F 4 F 1 
• After assigning a memory name 
F 5 
Input space 
Delete a character 
Move cursor forwards 
Move cursor backwards 
Selects character type 
DX spot 
abc DEL SPC 
F 2 F 3 F 4 F 1 F 5 
[V/M] 
Tuning dial [M-CH]
MP-W 
MP-R 
 Memo pads 
The transceiver has a memo pad function to store frequency 
and operating mode for easy write and recall. 
The memo pads are separate from memory channels. 
The default number of memo pads is 5, however, this 
can be increased to 10 in set mode if desired. (p. 85) 
DWriting frequencies and operating 
modes into memo pads 
.Push [MP-W] to store the displayed frequency and 
operating mode into a memo pad. 
• Each push of [MP-W] stores a frequency and mode into 
the next available memo pad; when you write a 6th (or 
11th) frequency and operating mode, the oldest written 
frequency and operating mode are automatically erased 
to make room for the new settings. 
• Displayed frequency and mode 
AGC DUP CMP TBW SCP 
In this example, pushing [MP-W] enters 21.28000 MHz 
USB into the top memo pad and erases the oldest 
memo pad (21.34724 MHz LSB). 
DRecalling a memo pad 
.Push [MP-R] to recall a memo pad. 
• Each push of [MP-R] recalls a memo pad, starting from 
the most recently written. 
• VFO or memory mode 
AGC DUP CMP TBW SCP 
MP-R 
MEMORY OPERATION 7 
NOTE: Each memo pad must have its own unique 
combination of frequency and operating mode; 
memo pads having identical settings cannot be written. 
• Stored in next available memo pad 
Erased 
• Memo pads 
68
8 SCANS 
Scan 
Jump 
SEL 
Mch 3 
Mch 7 
SEL 
 Scan types 
PROGRAMMED SCAN 
Repeatedly scans between two scan edge frequencies 
(scan edge memory channels P1 and P2). 
Scan edge 
P1 or P2 
This scan operates in VFO mode. 
MEMORY SCAN 
Repeatedly scans all programmed memory channels. 
Mch 2 
Mch 1 SEL
Mch 99 
SEL 
This scan operates in memory mode. 
 Preparation 
.Channels 
For programmed scan: 
Program scan edge frequencies into scan edge memory 
channels P1 and P2. 
For ¡ÓF scan: 
Set the ¡ÓF span (¡ÓF scan range) in the scan screen. 
For memory scan: 
Program 2 or more memory channels except scan 
edge memory channels. 
For select memory scan: 
Designate 2 or more memory channels as select memory 
channels. To designate the channel as a select 
memory channel, choose a memory channel, then 
push [F3 SEL] in the scan screen, or push [F5 SEL] 
in the memory name screen. 
.Scan resume ON/OFF 
You can select the scan to resume or cancel when detecting 
a signal, in set mode. Scan resume ON/OFF 
must be set before operating a scan. See p. 70 for 
ON/OFF setting and scan resume condition details. 
69 
¡ÓF SCAN 
Repeatedly scans within ¡ÓF span area. 
Start frequency Scan edge 
P2 or P1 +¡ÓF frequency .¡ÓF frequency 
Scan Scan 
Jump 
This scan operates in both VFO and memory modes. 
SELECT MEMORY SCAN 
Repeatedly scans all selected memory channels. 
SEL 
Mch 4 Mch 4 Mch 3 Mch 2 
SEL SEL Mch 5 Mch 1 Mch 5 SEL 
Mch 6 Mch 6 Mch 99 Mch 7 
SEL SEL 
This scan operates in memory mode. 
.Scan speed 
Scan speed can be selected from 2 levels, high or low, 
in set mode. See p. 70 for details. 
MEMORY SCAN 
Scan pauses on 
each channel when 
the scan resume is 
ON; not applicable 
when OFF. 
.Squelch condition 
PROGRAMMED 
SCAN 
SCAN 
STARTS 
WITH 
SQUELCH 
OPEN 
The scan continues 
until it is stopped 
manually, and does 
not pause even if it 
detects signals. 
Scan stops when detecting a signal. 
SQUELCH 
CLOSED 
If you set scan resume ON in scan set 
mode, the scan pauses for 10 sec. when 
detecting a signal, then resumes. When a 
signal disappears while scan is paused, 
scan resumes 2 sec. later.
 Voice squelch control function 
This function is useful when you don¡¯t want unmodulated 
signals pausing or cancelling a scan. When the 
voice squelch control function is activated, the receiver 
checks received signals for voice components. 
If a receiver signal includes voice components, and the 
tone of the voice components changes within 1 sec., 
scan pauses (or stops). If the received signal includes 
no voice components or the tone of the voice components 
does not change within 1 sec., scan resumes. 
.While M2 is selected with [MENU], push [F5 VSC] 
to switch the VSC (Voice Squelch Control) function 
ON and OFF. 
. ¡°VSC¡± appears when the function is activated. 
. The VSC function activates for any scan. 
.The VSC function resumes the scan on unmodulated 
signals, regardless of whether the scan resume 
condition is set to ON or OFF. 
 Scan set mode 
When the squelch is open, scan continues until it is 
stopped manually. it does not pause on detected signals. 
When squelch is closed, scan stops when detecting 
a signal, then resumes according to the scan 
resume condition. Scan speed and the scan resume 
condition can be set using the scan set mode. 
q Push[MENU] to select M2. 
w Push [F1 SCN] to select scan menu. 
e Push [F5 SET] to select scan set mode. 
r Push [F1 ¡Â] or [F2 ¡Ã] to select SCAN Speed 
item. 
t Rotate the tuning dial to select scan speed from 
high and low. 
. ¡°HIGH¡± : scan is faster 
. ¡°LOW¡± : scan is slower 
y Push [F2 ¡Ã] to select SCAN Resume item. 
u Rotate the tuning dial to select scan resume function 
from ON and OFF. 
: when detecting a signal, scan pauses for 
10 sec., then resumes. When a signal disappears, 
scan resumes 2 sec. later. 
. ¡°ON¡± 
. ¡°OFF¡± : when detecting a signal, cancels scanning. 
i Push [MENU] to return to scan menu. 
SCN MEM SWR TCN VSC 
F 1 F 5 F 4 F 3 F 2 
Push [F5] to turn the VSC function ON and OFF. 
SCN MEM SWR TCN VSC 
F 1 F 5 F 4 F 3 F 2 
Push [F1] 
¡ÓF:¡¾1Ok 
PRO ¡ÓF FIN SPN SET 
F 1 
F 1 
F 1 
F 5 F 2 F 3 F 4
Push [F5] 
SCANS 8 
VSC indicator 
SCAN Speed 
1 
F 2 F 3 F 4 
Push [F1] or [F2] 
HIGH 
F 5 
ON
F 5 
SCAN Resume 
2 
F 2 F 3 F 4 
70
8 SCANS 
 Programmed scan/Fine programmed scan (VFO mode) 
Programmed scan searches for signals between scan 
edge memory channels P1 and P2. The default frequencies 
for these memories are 0.500000 MHz and 
29.99999 MHz, respectively. See p. 66 for scan edges 
programming. 
q Push [V/M] to select VFO mode, if necessary. 
w Select the desired operating mode. 
.The operating mode can also be changed while scanning. 
e Push [TS] to select a tuning step. 
. The tuning step can also be changed while scanning. 
r Push [MENU] to select M2. 
t Push [F1 SCN] to select the scan menu. 
. See p. 69 for scan condition. 
. If the [RF/SQL] control function is set as �gAUTO,�h the 
squelch is always open in SSB, CW and RTTY modes. 
yPush [F1 PRO] to start the programmed scan. 
. The MHz and kHz decimal points blink while scanning. 
u When the scan detects a signal, the scan stops, 
pauses or ignores it depending on the resume, VSC 
setting and the squelch condition. 
i To cancel the scan, push [F1 PRO]. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
If the same frequencies are programmed into the 
scan edge memory channel P1 and P2, programmed 
scan does not start. 
DAbout the Fine programmed scan 
During programmed scan, when a signal is received, 
scan continues, but the tuning step is temporarily set to 
10 Hz. 
q Follow steps q to y above to start programmed 
scan. 
w During programmed scan, push [F3 FIN] to switch 
between programmed scan and fine programmed 
scan operation. 
e Push [F1 PRO] to cancel the scan. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
[MENU] 
[TS] 
Tuning dial 
Mode keys 
71 
SCN MEM SWR TCN VSC 
F 1 F 5 F 4 F 3 F 2 
Push [F1] 
�İF:�}1Ok 
PRO �İF FIN SPN SET 
F 1 F 5 F 2 F 3 F 4 
Push [F1] 
PROG SCAN 
PRO �İF FIN SPN SET 
F 1 
Push [F1] to start/cancel the scanning. 
F 5 F 2 F 3 F 4 
PROG SCAN 
PRO �İF FIN SPN SET 
F 1 
Push [F3] to switch 
between programmed 
scan and fine programmed 
scan. 
F 5 F 2 F 3 F 4 
F-PROG SCAN 
PRO �İF FIN SPN SET 
F 1 F 5 F 2 F 3 F 4 
[V/M]
 Memory scan operation (Memory mode) 
Memory scan searches through memory channel 1 to 
99 for signals. Blank (unprogrammed) memory channels 
are skipped. 
q Push [V/M] to select memory mode, if necessary. 
w Push [MENU] to select M2. 
e Push [F1 SCN] to select the scan menu. 
. See p. 69 for scan condition. 
. If the [RF/SQL] control function is set as �gAUTO,�h the 
squelch is always open in SSB, CW and RTTY modes. 
r Push [F1 MEM] to start the memory scan. 
. The MHz and kHz decimal points blink while scanning. 
.At least 2 memory channels must be programmed for 
memory scan to proceed. 
t To cancel the scan, push [F1 MEM]. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
 Select memory scan 
Select memory scan searches through memory channels 
set as �gselect,�h for signals. See below for setting 
and deleting select memory channels. 
q Follow the steps q to r above to start memory 
scan. 
w During memory scan, push [F3 SEL] to switch between 
memory scan and select memory scan. 
. At least 2 memory channels must be set as the select 
channel. 
e Push [F1 MEM] to cancel the scan. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
DSetting/Cancelling select memory channels 
All memory channels, except scan edges (P1 and P2), 
can be set as a select memory channels. 
.While the scan menu is selected, push [F3 SEL] to 
set/cancel the displayed memory channel as a select 
channel; or while memory name screen is indicated, 
push [F5 SEL] to set/cancel the displayed 
memory channel as a select memory channel. 
. �gSEL�h appears when the channel is set as a select memory 
channel. 
. �gSEL�h disappears when cancelled. 
.Push [F3 SEL]/[F5 SEL] for 1 sec to cancel all select 
memory settings. 
SCANS 8 
[V/M] [MENU] Tuning dial 
MEMO SCAN 
MEM �İF SEL SPN SET 
F 5 F 2 F 3 F 4 F 1 
Push [F1] to start/cancel the scanning. 
MEMO SCAN 
MEM �İF SEL SPN SET 
F 5 F 2 F 3 F 4 F 1 
Push [F3] to switch 
between memory scan 
and select memory 
scan. 
SEL-MEMO SCAN 
MEM �İF SEL SPN SET 
F 5 F 2 F 3 F 4 F 1 
. Scan menu 
�İF:�}1Ok 
MEM �İF SEL SPN SET 
F 5 F 2 F 3 F 4 F 1 
Push [F3] to set/cancel as a select channel. 
Select memory inidcator 
. Memory name screen 
14.195OO USB 
EDT ( ) SEL 
F 5 F 2 F 3 F 4 F 1 
Push [F3] to set/cancel as a select channel. 
72
8 SCANS 
 �İF scan operation and Fine �İF scan 
�İF scan searches for signals within the specified 
range with the displayed VFO or memory channel frequency 
as for center frequency. The frequency range 
is specified by the span. 
q Push [V/M] to select VFO mode or memory mode, 
as desired. 
w Set center frequency of the �İF scan. 
e Push [MENU] to select M2. 
r Push [F1 SCN] to select the scan menu. 
. See p. 69 for scan condition. 
. If the [RF/SQL] control function is set as �gAUTO,�h the 
squelch is always open in SSB, CW and RTTY modes. 
t Set the �İF span by pushing [F4 SPN]. 
.�}5 kHz, �}10 kHz, �}20 kHz, �}50 kHz, �}100 kHz, 
�}500 kHz and �}1 MHz are selectable. 
y Push [F2 �İF] to start the �İF scan. 
. Decimal points blink while scanning. 
u When the scan detects a signal, the scan stops, 
pauses or ignores it depending on the VSC, resume 
setting and the squelch condition. 
i Push [F2 �İF] to cancel the �İF scan. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
DAbout the Fine �İF scan 
During �İF scan, when a signal is received, scan continues, 
but the tuning step is temporarily set to 10 Hz. 
q Follow steps q to y above to start programmed 
scan. 
w During �İF scan, push [F3 FIN] to switch between 
�İF scan and fine �İF scan operation. 
e Push [F2 �İF] to cancel the scan. 
. Rotating the tuning dial during scan also cancels scan 
operation. 
73 
Keypad [V/M] 
Tuning dial [MENU] 
SCN MEM SWR TCN VSC 
F 5 F 4 F 3 F 2 F 1 
Push [F1] 
�İF:�}1Ok 
PRO �İF FIN SPN SET 
F 5 F 2 F 3 F 4 F 1
Push [F2] Push [F4] to select the span. 
�İF SCAN 
PRO �İF FIN SPN SET 
F 5 F 2 F 3 F 4 F 1 
Push [F2] to start/cancel the scanning. 
�İF SCAN 
PRO �İF FIN SPN SET 
F 5 F 2 F 3 F 4 F 1 
Push [F3] to switch 
between programmed 
scan and fine programmed 
scan. 
F-�İF SCAN 
PRO �İF FIN SPN SET 
F 5 F 2 F 3 F 4 F 1
 Tone scan/DTCS code scan operation 
By monitoring a signal that is being operated with a repeater, 
tone squelch or DTCS, you can determine the 
tone frequency necessary to open a repeater or the 
squelch. 
qPush [AM/FM] to select FM mode. 
wPush [MENU] several times to select M1. 
ePush [F4 TONE] for 1 sec. to enter tone set mode. 
rPush [F1 TON] to select the tone type to be 
scanned. 
• “Rptr Tone” for repeater tone, “TSQL Tone” for 
tone squelch and “DTCS Code” for DTCS code can be 
selected. 
•When selecting DTCS code to be scanned, push [F5] 
several times to select the DTCS code polarity. 
“NN” : Normal polarity for both transmit and receive. 
“NR” : Normal polarity for transmit and reverse polarity 
for receive. 
“RN” : Reverse polarity for transmit and normal polarity 
for receive. 
“RR” : Reverse polarity for both transmit and receive. 
tPush [F2 SCN] to start the tone scan function. 
• “Rptr Tone SCAN,” “TSQL Tone SCAN” or 
“DTCS Code SCAN” blinks when repeater tone scan, 
tone squelch scan or DTCS code scan is operated, respectively. 
yWhen a matched tone or code is found, the scan 
pauses and the tone frequency or code is set for the 
selected tone as in step r. 
When the tone scan or DTCS code scan is operated 
in memory or call channel mode, the detected tone frequency 
or code can be used temporarily. 
To keep the detected tone frequency or code setting 
for memory contents, you must over-write the memory 
or call channel. 
uPush [F2 SCN] to cancel the tone scan function. 
•Rotating the tuning dial during scan also cancels scan 
operation. 
SCANS 8 
AGC DUP CMP TON SCP 
F 5 F 4 F 3 F 2 F 1 
Push [F4] for 1 sec. 
Rptr Tone 
TON SCN 88.5Hz 
F 5 F 4 F 3 F 2 F 1 
Push [F1] several times to select tone type. 
• Repeater tone scan 
Rptr Tone SCAN 
TON SCN 88.5Hz 
F 5 F 4 F 3 F 2 F 1 
Push [F2] to start/cancel the scan. 
• Tone squelch tone scan 
TSQL Tone SCAN 
TON SCN 88.5Hz 
F 5 F 4 F 3 F 2 F 1 
Push [F2] to start/cancel the scan. 
• DTCS code scan 
DTCS Code SCAN 
TON SCN O23-NN 
F 5 F 4 F 3 F 2 F 1 
Push [F2] to start/cancel the scan. 
Push [F1] several times to select polarity. 
74
9 ANTENNA TUNER OPERATION 
 Antenna connection and selection 
The IC-746PRO has 2 antenna connectors for the 
HF/50 MHz bands, [ANT1] and [ANT2], and 1 antenna 
connector for the 144 MHz band; a total of 3 antenna 
connectors. 
For each operating band the IC-746PRO covers, there 
is a band memory which can memorize a selected antenna. 
When you change the operating frequency beyond 
a band, the previously used antenna is automatically 
selected (see below) for the new band. This 
function is convenient when you use 2 antennas for HF 
and 50 MHz bands operation. 
• Antenna select function: “Auto” 
Once an antenna has been selected for use with a 
band by pushing [ANT], the antenna is automatically 
selected whenever that band is accessed. 
[EXAMPLE]: a 3.5/7 MHz antenna is connected to 
[ANT1], a 21/28/50 MHz antenna is connected to 
[ANT2]. When the antenna selector function is set to 
“Auto,” an antenna is automatically selected when 
changing bands. 
• Antenna select function: “Manual” 
When “Manual” is selected, you can use the [ANT1] 
and [ANT2], however, band memory does not function. 
In this case you must select an antenna manually. 
However, the 144 MHz antenna will still be 
selected automatically. 
[EXAMPLE]: an optional antenna tuner and HF antenna 
are connected to [ANT1] and a 50 MHz antenna 
is connected to [ANT2]. 
• Antenna select function: “OFF” 
In this case, only [ANT1] and the 144 MHz antenna 
connector can be used. [ANT] switch does not function. 
[ANT] 
144 MHz 
144 MHz band 50 MHz band 
75 
21/28/50 MHz 
[ANT2] 
[ANT2] 
3.5/7 MHz 
[ANT1] 
HF bands 
AH-4 
[ANT1]
 Antenna tuner operation 
The internal automatic antenna tuner matches the 
transceiver to the connected antenna automatically. 
Once the tuner matches an antenna, the variable capacitor 
angles are memorized as a preset point for each 
frequency range (100 kHz steps). Therefore, when you 
change the frequency range, the variable capacitors are 
automatically preset to the memorized point. 
CAUTION: NEVER transmit with the tuner ON 
when no antenna is connected. This will damage 
the transceiver. Be careful of the antenna selection. 
DTUNER OPERATION 
.Push [TUNER] to turn the internal antenna tuner 
ON. The antenna is tuned automatically when the 
antenna SWR is higher than 1.5:1. 
. When the tuner is ON, the ¡°TUNE¡± indicator appears. 
.MANUAL TUNING 
During SSB operation at low voice levels, the internal 
tuner may not be tuned correctly. In such cases, manual 
tuning is helpful. 
.Push [TUNER] for 1 sec., to start manual tuning. 
.A side tone is emitted and ¡°TUNE¡± indicator blinks while 
tuning. 
. If the tuner cannot reduce the SWR to less than 1.5:1 
after 20 sec. of tuning, the [TUNER] switch indicator 
goes out. 
.AUTOMATIC TUNER START (HF bands only) 
If you want to deactivate the tuner under conditions 
of VSWR 1.5:1 or less, use the auto tuner start function 
and turn the tuner OFF. This function activates 
the tuner automatically when the SWR exceeds 1.5:1. 
This function is turned ON in set mode. (p. 84). 
.PTT TUNER START 
The tuner is always tuned when the PTT is pushed 
after the frequency is changed (more than 1% from 
last-tuned frequency). This function removes the 
¡°push and hold [TUNER]¡± operation and activates for 
the first transmission on a new frequency. 
This function is turned ON in set mode. (p. 84). 
.Antenna tuner of the IC-PW1 
When using an external antenna tuner such as the 
IC-PW1¡¯s tuner, tune with the external antenna tuner, 
while the internal tuner is turned OFF. After tuning is 
completed, turn the internal tuner ON. Otherwise, 
both tuners tune simultaneously and correct tuning 
may not be obtained. 
See the instruction manual included with each antenna 
tuner for their respective operations. 
ANTENNA TUNER OPERATION 9 
[TUNER] 
NOTES: 
.The internal antenna tuner can only tune the HF and 
50 MHz bands. the 144 MHz band cannot be tuned. 
.NEVER transmit without an antenna properly connected 
to antenna port in use. 
. When 2 antennas are connected, select the antenna to 
be used with [ANT]. 
. If the SWR is higher than about 1.5:1 when tuning above 
100 kHz on an antenna¡¯s preset point, push [TUNER] for 
1 sec. to start manual tuning. 
. The internal tuner may not be able to tune in AM mode. In 
such cases, push [TUNER] for 1 sec. to manually tune. 
DIf the tuner cannot tune the antenna 
Check the following and try again: 
. the [ANT] connector selection. 
. the antenna connection and feedline. 
.the unaltered antenna SWR. (Less than 3:1 for HF bands; 
Less than 2.5:1 for 50 MHz band) 
.the transmit power. (8 W for HF bands; 15 W for 50 MHz 
band) 
. the power source voltage/capacity. 
If the tuner cannot reduce the SWR to less than 1.5:1 
after checking the above, perform the following: 
. repeat manual tuning several times. 
. tune with a 50 §Ù dummy load and re-tune the antenna. 
.turn power OFF and ON. 
. adjust the antenna cable length. 
(This is effective for higher frequencies in some cases.) 
.Some antennas, especially for low bands, have a narrow 
bandwidth. These antennas may not be tuned at the 
edge of their bandwidth, therefore, tune such an antenna 
as follows: 
[Example]: Suppose you have an antenna which has an 
SWR of 1.5:1 at 3.55 MHz and an SWR of 3:1 at 3.8 MHz. 
q Push [TUNER] to turn the antenna tuner ON. 
w Select CW mode. 
e Turn OFF the break-in function. (p. 56) 
r Push [TRANSMIT] to set to the transmit condition. 
t Set 3.55 MHz and key down. 
y Set 3.80 MHz and key down. 
u Push [TRANSMIT] to return to the receive condition. 
76
9 ANTENNA TUNER OPERATION 
 Optional external tuner operation 
DAH-4 HF/50 MHz AUTOMATIC ANTENNA TUNER 
The AH-4 matches the IC-746PRO to a long wire antenna 
more than 7 m/23 ft long (3.5 MHz and above). 
. See the AH-4 instruction manual for AH-4 installation and 
antenna connection details. 
NEVER operate the AH-4 without an antenna wire. 
The tuner and transceiver will be damaged. 
NEVER operate the AH-4 when it is not grounded. 
Transmitting before tuning may damage the transceiver. 
Note that the AH-4 cannot tune when using a 
1.2 ă long wire or multiple of the operating frequency. 
When connecting the AH-4, the antenna connector 
assignments are [ANT2] for the internal tuner and 
[ANT1] for the AH-4. The antenna indicator in the 
LCD displays �gEXT�h when the AH-4 is connected 
and selected. 
Coaxial cable (from AH-4) 
Ground 
AH-4 setting example: 
For mobile operation 
For outdoor operation 
AH-4 
DAH-4 operation 
Tuning is required for each frequency. Be sure to 
re-tune the antenna before transmitting when you 
change the frequency. even slightly. 
q Set the desired frequency in an HF or 50 MHz 
band. 
.The AH-4 may not operate on frequencies outside of 
ham bands. 
w Push [TUNER] for 1 sec. 
. �gTUNER�h blinks while tuning. 
e �gTUNE�h appears constantly when tuning is complete. 
. When the connected wire cannot be tuned, the �gTUNE�h 
indicator goes out, and the AH-4 is bypassed. At that 
point the antenna wire connection root is to the transceiver 
directly, and not via AH-4 antenna tuner. 
r To bypass the AH-4 manually, push [TUNER]. 
. Connecting the AH-4 
ANT1 Transceiver
Control cable 
77 
Optional AH-2b 
antenna element 
Long wire 
RWARNING: HIGH VOLTAGE! 
NEVER touch the antenna element while tuning or 
transmitting. 
[TUNER] 
Long wire or optional AH-2b
Connections 
 When connecting to [DATA] 
• When using a PC application 
q DATA IN 
w GND 
r DATA OUT (9600 bps) 
y P SQL* 
t AF OUT (1200 bps) 
e PTT P 
• When using a TNC 
q DATA IN 
w GND 
r DATA OUT (9600 bps) 
y P SQL* 
t AF OUT (1200 bps) 
e PTT P 
 When connecting to [ACC(1)] 
• When using a PC application 
2 
4 5
3 1 8 
RTTY 
GND 
AF 
SEND 
RTTY OUTPUT 
GND 
AUDIO INPUT 
PTT 6 7 
• When using a TNC 
RTTY 
GND 
2 
4 5
3 1 8 
RTTY OUTPUT 
GND 
AUDIO INPUT 
PTT 
AF 
SEND 
6 7 
Rear panel view 
AUDIO OUTPUT 
AF INPUT 
GND 
PTT* 
 When connecting to [MIC] 
• When using a PC application 
MIC INPUT 
AF OUTPUT 
MIC GND 
GND 
PTT* 
• When using a TNC 
AFSK OUTPUT MIC INPUT 
AF INPUT AF OUTPUT 
GND 
MIC GND 
GND 
PTT* 
SQL INPUT 
PTT* 
SQL 
TX AUDIO 
GND 
RX AUDIO 
SQL 
PTT 
TX AUDIO 
GND 
RX AUDIO 
SQL 
PTT 
DATA COMMUNICATION 10 
PC 
Connect to serial port, parallel 
port, speaker jack, microphone 
jack and line IN/OUT jack, etc. 
See the instruction manual of the 
application for details. 
TNC 
RS-232C 
*When connecting the squelch line, consult the necessary manual (TNC, etc.) 
PC 
Connect to serial port, parallel 
port, speaker jack, microphone 
jack and line IN/OUT jack, etc. 
See the instruction manual of the 
application for details. 
TNC or scan converter 
RS-232C 
PC 
Connect to serial port, parallel 
port, speaker jack, microphone 
jack and line IN/OUT jack, etc. 
See the instruction manual of the 
application for details. 
TNC or scan converter 
RS-232C 
*When using the VOX function, no need to connect. Refer to the instruction 
manual of the external equipment (TNC, etc.). 
When connecting the squelch line, consult the necessary manual (TNC, etc.). 
78
10 DATA COMMUNICATION 
Packet (AFSK) operation 
Before operating packet (AFSK) be sure to consult the 
operating manual that came with your TNC. 
qConnect a TNC and PC. (p. 78) 
wPush a band key to select an operating band. 
ePush [SSB] or [AM/FM] to select the desired operating 
mode. 
• After LSB or USB is selected, push [SSB] for 1 sec. to 
select LSB data or USB data mode, or after AM or FM is 
selected, push [AM/FM] for 1 sec. to select AM data or 
FM data mode. 
• Generally, LSB is used on HF bands and FM is used for 
packet operation on the VHF band. 
rRotate the tuning dial to tune the desired signal. 
tTransmit your AFSK signals using your computer’s 
keyboard. 
• Rotate [RF PWR] to set the output power. 
• Relative strength of the transmitted signal is indicated in 
the Po meter while operating the TNC. 
•When operating in SSB (data) mode, adjust output 
power so that the ALC reading in the ALC meter stays 
in the ALC zone. 
NOTE: When connecting a TNC to the ACC socket 
on the rear panel, select SSB (LSB/USB) data mode 
or disconnect the microphone and rotate [MIC 
GAIN] fully counterclockwise. 
When SSB data mode is selected, the audio input 
from the [MIC] connector is automatically cut, and 
the audio input from the [ACC(1)] is used. 
Also, when the SSB data mode is selected, the fixed 
setting listed below are selected automatically; 
•Speech compressor : OFF 
•Transmit bandwidth : MID 
• Tx tone (Bass) : 0 
• Tx tone (Treble) : 0 
DFrequency indication during AFSK operation 
When operating AFSK in SSB mode, the indicated frequency 
is the signals carrier point. 
• Example— LSB/LSB data mode 
Mark freq.: 2125 Hz 
Shift freq.: 200 Hz 
79 
Band keys [TX] indicator [TRANSMIT] 
[AM/FM] Tuning dial [MIC GAIN] [SSB] 
Selected mode indicator appears 
2325 Hz 
2125 Hz 200 Hz 
Carrier point 
(Displayed frequency)
Adjusting the TNC output level 
When setting data transmission speed to 9600 bps, 
the data signal coming from the TNC is applied exclusively 
to the internal limiter circuitry to automatically 
maintain band width. 
NEVER apply data levels from the TNC of over 0.6 V 
p-p, otherwise the transceiver will not be able to maintain 
the band width and may possibly interfere with 
other stations. 
DUsing with a level meter or synchroscope 
: recommended level 
When using a level meter or synchroscope, adjust the 
TX audio output level (DATA IN level) from the TNC as 
follows. 
0.4 V p-p (0.2 Vrms) 
0.2¨C0.5 V p-p (0.1¨C0.25 Vrms) : acceptable level 
DNot using a measuring device 
q Connect the transceiver to a TNC. (p. 78) 
w Enter a test mode (¡°CAL,¡± etc.) on the TNC, then 
transmit some test data. 
e When the transceiver fails to transmit the test data 
or transmits sporadically (TX indicator doesn¡¯t light 
or flashes): 
-Decrease the TNC output level until the transmit 
indicator lights continuously. 
When transmission is not successful even though 
the TX indicator lights continuously: 
- Increase the TNC output level. 
Data transmission speed 
For data communication (in FM mode), the transceiver 
can be set to to a maximum data speeds of 9600 bps 
(or less; 1200, 2400 or 4800 bps). 
qPush [MENU] for 1 sec. to enter set mode. 
wPush [F1 ¡Ü] or [F2 ¡İ] to select the 9600bps 
Mode item. 
eRotate the tuning dial to turn the 9600 bps mode ON 
and OFF. 
ON : 9600 bps of data speed 
OFF : 1200, 2400 or 4800 bps of data speed 
(default) 
rPush [MENU] to return to previous indication. 
DATA COMMUNICATION 
96OObps Mode
OFF 21 
Select with the tuning dial 
96OObps Mode
ON 21 
10 
80
11 SET MODE 
 General set mode 
D Entering set mode 
Set mode is used for programming infrequently 
changed values or conditions of functions. 
.Set mode operation 
q Push [MENU] several times to select the function 
menu indication, if necessary. 
w Push [MENU] for 1 sec. to enter the set mode. 
e Push [F1 ¡Â] or [F2 ¡Ã] to select the desired item. 
r Set the desired condition using the tuning dial. 
.Push [F3] for 1 sec. to select a default condition or value. 
t Push [MENU] to exit the set mode. 
D Set mode items 
1. LCD Contrast 
This item adjusts the contrast of the LCD from 0% to 
100% in 1% steps. 
(default: 50%) 
2. LCD Backlight 
This item adjusts the brightness of the LCD from 0% 
to 100% in 1% steps. 
(default: 50%) 
3. Beep Level 
This item adjusts the volume level for confirmation 
beep tones from 0% to 100% in 1% steps. When the 
beep tones, item 6. Beep (p. 82), are turned OFF, 
this setting has no effect. 
(default: 50%) 
4. Beep Level-lmt 
This item allows you to set a maximum volume level 
for confirmation beep tones. Confirmation beep tones 
are linked to the [AF] control until a specified volume 
level is reached.further rotation of the [AF] control 
will not increase the volume of the beep tones. 
Confirmation beep ON (default) 
Confirmation beep OFF 
ON 
OFF 
5. CAL. Marker 
This item is used for a simple frequency check of the 
transceiver. 
Calibration marker ON 
Calibration marker OFF (default) 
ON 
OFF 
See p. 94 for calibration procedure. 
81 
[F1 ¡Â] [F2 ¡Ã] 
Tuning dial [MENU] 
LCD Contrast 
1 5O% 
LCD Backlight 
2 5O% 
Beep Level 
3 5O% 
Beep Level-lmt 
ON 4
Cal. Marker 
5 OFF 
Turn the calibration marker OFF after checking the 
frequency of the transceiver.
 General set mode (continued) 
Confirmation beep ON (default) 
Confirmation beep OFF 
6. Beep 
A beep sounds each time a switch is pushed to con- 
firm it. This function can be turned OFF for silent operation. 
ON 
OFF 
The volume level can be set in 3. Beep Level. 
(p. 81) 
7. Band Edge Beep 
A beep sounds when an operating frequency enters 
or exits an amateur band. This functions independent 
of the confirmation beep setting (above). 
Band edge beep ON (default) 
Band edge beep OFF 
ON 
OFF 
The volume level can be set in 3. Beep Level. 
(p. 81) 
8. RF/SQL Control 
The [RF/SQL] control can be set as the RF/squelch 
control (default), the squelch control only (RF gain is 
fixed at maximum) or ‘Auto’ (RF gain control in SSB, 
CW and RTTY; squelch control in AM and FM). 
RF+SQL [RF/SQL] control as RF/squelch con- 
SQL 
AUTO 
trol (default) 
[RF/SQL] control as squelch control 
[RF/SQL] control as RF gain control 
in SSB, CW and RTTY; squelch control 
in AM and FM 
9. Meter Peak Hold 
This item turns the meter peak hold function ON and 
OFF. When set to ON (default), peak meter readings 
are displayed for about 0.5 sec. 
10. COMP Meter 
This item turns the COMP meter indication ON and 
OFF during transmit. When set to ON, the COMP 
meter is displayed instead of the SWR meter. 
(default: OFF) 
SET MODE 11 
Beep 
6 ON 
Band Edge Beep 
7 ON 
RF/SQL Control 
RF+SQL 8
Meter Peak Hold 
ON 9
COMP Meter 
1O OFF 
82
11 SET MODE 
Quick SPLIT 
ON 11
SPLIT Offset 
O.OOOMHz 12
SPLIT LOCK 
13 OFF 
DUP Offset HF 
O.1OOMHz 14
DUP Offset 5OM 
O.5OOMHz 15
DUP Offset 144M 
O.6OOMHz 16 
 General set mode (continued) 
11. Quick SPLIT 
When this item is set to ON, pushing [SPLIT] for 1 
sec. sets the transmit frequency using the displayed 
frequency and the split offset, set in SPLIT Offset 
item below, and activates the split function automatically. 
Quick split ON (default) 
Quick split OFF 
ON 
OFF 
12. SPLIT Offset 
This item sets the offset (difference between transmit 
and receive frequencies) for the quick split function. 
The offset frequency can be set from –9.999 MHz to 
+9.999 MHz in 1 kHz steps. 
13. SPLIT LOCK 
When this item is ON, the tuning dial can be used to 
adjust the transmit frequency while pushing [XFC] 
even while the dial lock function is activated. 
Split lock function ON 
Split lock function OFF (default) 
ON 
OFF 
14. DUP Offset HF 
This item sets the offset (difference between transmit 
and receive frequencies) for duplex operation. However, 
this setting is used to input the repeater offset 
for an HF band only. 
The offset frequency can be set from 0.000 MHz to 
9.999 MHz in 1 kHz steps. 
15. DUP Offset 50M 
This item sets the offset (difference between transmit 
and receive frequencies) for duplex operation. However, 
this setting is used to input the repeater offset 
for a 50 MHz band only. 
The offset frequency can be set from 0.000 MHz to 
9.999 MHz in 1 kHz steps. 
16. DUP Offset 144M 
This item sets the offset (difference between transmit 
and receive frequencies) for duplex operation. However, 
this setting is used to input the repeater offset 
for a 144 MHz band only. 
The offset frequency can be set from 0.000 MHz to 
9.999 MHz in 1 kHz steps. 
83
 General set mode (continued) 
17. One Touch Rptr 
This item turns the one touch repeater function ON 
(DUP- or DUP+) and OFF. 
When [F2 DUP] is pushed for 1 sec. in M1, the selected 
offset direction and the programmed duplex 
offset frequency (depending on the operating frequency 
band) is set with the displayed frequency. 
18. Auto Repeater 
This item turns the auto repeater function to ON-1 
(auto duplex setting), ON-2 (auto duplex setting and 
activating tone encoder) or OFF. 
See p. 46 for details concerning the auto repeater 
function. 
19. Auto Tune 
The internal antenna tuner has an automatic start capability 
which starts tuning if the SWR is higher than 
1.5–3:1 in the HF bands. 
When “OFF” is selected, the tuner remains OFF even 
when the SWR is poor (1.5–3:1). When “ON” is selected, 
automatic tune starts even when the tuner is 
turned OFF. 
20. PTT Tune 
Tuning of the internal or external antenna tuner can 
be started automatically at the moment the PTT is 
pushed after the operating frequency is changed 
(more than 1% from the last-tuned frequency). 
21. 96OObps Mode 
This item turn the 9600 bps data transmission capability 
ON and OFF. 
: For 9600 bps data transmission. 
: For the regular audio (or slower data) 
ON 
OFF 
transmission only. 
SET MODE 11 
One Touch Rptr 
DUP- 17
Auto Repeater 
ON-1 18
Auto Tune 
19 OFF 
PTT Tune 
2O OFF 
96OObps Mode
OFF 21 
84
11 SET MODE 
[ANT] Switch 
Auto 22
SPEECH Language 
English 23
SPEECH Speed
HIGH 24
SPEECH S-Level 
ON 25
Memory Pad Ch
5 26 
 General set mode (continued) 
22. [ANT] Switch 
You can set the antenna connector selection to automatic, 
manual or non-selection (when using 1 antenna 
only for the HF/50 MHz bands). 
Auto : The antenna switch is activated and 
the band memory memorizes the selected 
antenna. (default) 
OFF 
Manual: The antenna switch is activated and 
selects an antenna manually. 
: The antenna switch is not activated 
and does not function. The [ANT1] connector 
is always selected in this case. 
23. SPEECH Language 
When the optional UT-102 VOICE SYNTHESIZER UNIT is 
installed, you can select between English and Japanese 
as the language. 
: Announces in English (default) 
Japanese : Announces in Japanese 
English 
See p. 90 for unit installation. 
24. SPEECH Speed 
When the optional UT-102 VOICE SYNTHESIZER UNIT is 
installed, you can select between faster or slower 
synthesizer output. 
HIGH : Announces faster (default) 
: Announces slower LOW 
See p. 90 for unit installation. 
25. SPEECH S-Level 
When the optional UT-102 VOICE SYNTHESIZER UNIT is 
installed, you can have frequency, mode and signal 
level announcement. Signal level announcement can 
be deactivated if desired. 
ON : Announces operating frequency, mode 
and receiving signal level. (default) 
: Announces operating frequency and 
mode only. 
OFF 
See p. 90 for unit installation. 
26. Memory Pad Ch 
This item sets the number of memo pad channels 
available. 5 or 10 memo pads can be set. 
5 : 5 memo pads (default) 
10: 10 memo pads 
85
SET MODE 11 
DIAL Auto TS
HIGH 27 
 General set mode (continued) 
27. DIAL Auto TS 
This item sets the auto tuning step function. When rotating 
the tuning dial rapidly, the tuning step automatically 
changes several times as selected. 
There are 2 type of auto tuning steps: HIGH (Fastest) 
and LOW (Faster). 
HIGH : Auto tuning step is turned ON. 
LOW 
Approx. 5 times fastest tuning step 
during rapid rotation (default) 
: Auto tuning step is turned ON. 
Approx. 2 times faster tuning step during 
rapid rotation 
: Auto tuning step is turned OFF. OFF 
MIC U/D Speed 
HIGH 28 
28. MIC U/D Speed 
This item sets the rate at which frequencies are 
scanned when the microphone [UP]/[DN] switches 
are pushed and held. High or low can be selected. 
HIGH : High speed (default, 50 tuning 
steps/sec.) 
: Low speed (25 tuning steps/sec.) LOW 
Quick RIT Clear 
OFF 29 
OFF 
29. Quick RIT Clear 
This item selects the RIT/�İTX frequency clearing instruction 
with [PBTC]. 
ON : Clears the RIT/�İTX frequency when 
[PBTC] is pushed momentarily. 
: Clears the RIT/�İTX frequency when 
[PBTC] is pushed for 1 sec. (default) 
BW Popup (PBT) 
ON 3O 
30. BW Popup (PBT) 
This item turns the PBT shifting value indication ON 
and OFF during [TWIN PBT] control operation. When 
set to ON, the shifting value is displayed above the 
multi-function switches. 
(default: ON) 
BW Popup (FIL) 
ON 31 
31. BW Popup (FIL) 
This item turns the IF filter width indication ON and 
OFF when selecting with [FILTER]. When set to ON, 
the filter width is displayed above the multi function 
switches. 
(default: ON) 
86
11 SET MODE 
SSB/CW Sync Tun 
OFF 32
CW Normal Side 
LSB 33 
 General set mode (continued) 
32. SSB/CW Synchronous Tuning 
This item selects the displayed frequency shift function 
from ON and OFF. 
When this function is activated, the receiving signal 
can be kept in receive even when the operating mode 
is changed between SSB and CW. 
ON : The displayed frequency shifts when 
the operating mode is changed between 
SSB and CW. 
: The displayed frequency does not shift. 
(default) 
OFF 
The frequency shifting value may differ according 
to the CW pitch setting. 
33. CW Normal Side 
Selects the carrier point of CW mode from LSB and 
USB. 
LSB : The carrier point is set to LSB side. 
(default) 
: The carrier point is set to USB side. USB 
KEYER 1st Menu 
KEYER-Root 34 
KEYER-Root 
KEYER-SEND 
34. KEYER 1st Menu 
This item selects the appearing menu when [F4 KEY] 
is pushed in M1 at first, from KEYER-Root and 
KEYER-SEND. 
: Selects memory keyer 
menu first (default) 
: Selects keyer SEND menu 
first 
35 
2.2k. 
�}5% 
4.7k. 
�}5% 
S4 
(T4/M4) 
35. External Keypad 
This item sets the external keypad capability. 
: External keypad does not function. 
(default) 
switches, transmits the desired 
keyer memory contents during 
CW mode operation. 
OFF 
KEYER SEND: Pushing one of external keypad 
For your information 
The diagram as at right shows the equivalent circuit of 
an external keypad and connects to pin 3 and pin 7 
of the [MIC] connector (p. 12) 
External Keypad 
OFF 
1.5k. 
�}5% 
1.5k. 
�}5% To [MIC] connector pin e 
S3 
(T3/M3) 
S1 
(T1/M1) 
S2 
(T2/M2) To [MIC] connector pin u 
USER EXTERNAL KEYPAD 
87
SET MODE 11 
CI-V Baud Rate 
Auto 36
CI-V Address
66h 37
CI-V Transceive 
ON 38
CI-V 731 Mode 
OFF 39 
 General set mode (continued) 
36. CI-V Baud Rate 
This item sets the data transfer rate. 300, 1200, 4800, 
9600, 19200 bps and “Auto” are available. 
Auto : Auto baud rate (default) 
: 300 bps 
12OO : 1200 bps 
48OO : 4800 bps 
96OO : 9600 bps 
192OO : 19200 bps 
3OO 
When “Auto” is selected, the baud rate is automatically 
set according to the connected controller or remote 
controller. 
37. CI-V Address 
To distinguish equipment, each CI-V transceiver has 
its own Icom standard address in hexadecimal code. 
The IC-746PRO’s address is 66h. 
When 2 or more IC-746PRO’s are connected to an 
optional CT-17 CI-V LEVEL CONVERTER, rotate the tuning 
dial to select a different address for each IC- 
746PRO in the range 01h to 7Fh. 
38. CI-V Transceive 
Transceive operation is possible with the IC-746PRO 
connected to other Icom HF transceivers or receivers. 
: Transceive ON (default) 
: Transceive OFF 
ON 
OFF 
When “ON” is selected, changing the frequency, operating 
mode, etc. on the IC-746PRO automatically 
changes those of connected transceivers (or receivers) 
and vice versa. 
39. CI-V 731 Mode 
When connecting the IC-746PRO to the IC-735 for 
transceive operation, you must change the operating 
frequency data length to 4 bytes. 
• This item must be set to “ON” only when operating the 
transceiver with the IC-735. 
: 4 bytes of frequency data 
: 5 bytes of frequency data (default) 
ON 
OFF 
88
11 SET MODE 
 Tone control set mode 
DEntering tone control set mode 
Tone levels (bass and treble) for each transmit and receive 
audio can be set for each phone mode independently. 
.Set mode operation 
q Push [MENU] several times to select M2. 
w Push [F4 TCN] to select the tone control set mode. 
e Push [F1 ¡Â] or [F2 ¡Ã] to select the desired item. 
r Push [SSB] or [AM/FM] to select the desired operating 
mode. 
t Set the desired condition using the tuning dial. 
. Push [F3] for 1 sec. to select a default value. 
y Push [MENU] to exit the set mode. 
DTone control set mode items 
1. TX Bass 
This item adjusts the bass level of the transmit audio 
tone from .5 dB to +5 dB in 1 dB steps. 
2. TX Treble 
This item adjusts the treble level of the transmit audio 
tone from .5 dB to +5 dB in 1 dB steps. 
3. RX Bass 
This item adjusts the bass level of the receive audio 
tone from .5 dB to +5 dB in 1 dB steps. 
4. RX Treble 
This item adjusts the treble level of the receive audio 
tone from .5 dB to +5 dB in 1 dB steps. 
89 
[F1 ¡Â] [F2 ¡Ã] [F4 TCN] 
Tuning dial [MENU] 
TX Bass SSB 
1 O 
TX Treble SSB 
2 O 
RX Bass SSB 
3 O 
RX Treble SSB 
4 O
OPTION INSTALLATION 12 
MAIN unit 
UT-102 
R1925 J1920 
 Opening the transceiver’s case 
Follow the case and cover opening procedures shown 
here when you want to install an optional unit or adjust 
the internal units, etc. 
CAUTION: DISCONNECT the DC power cable 
from the transceiver before performing any work on 
the transceiver. Otherwise, there is danger of electric 
shock and/or equipment damage. 
q Remove the 2 screws from the left side of the transceiver 
to remove the carrying handle as shown at 
right. 
w Remove the 6 screws from the top of the transceiver 
and the 6 screws from the sides, then lift up 
the top cover. 
e Turn the transceiver upside down. 
r Remove 6 screws from the bottom of the transceiver, 
then lift up the bottom cover. 
 UT-102 VOICE SYNTHESIZER UNIT 
The UT-102 announces the accessed readout’s frequency, 
mode, etc. (S-meter level can also be announced
— p. 85) in a clear, electronically-generated 
voice, in English (or Japanese). 
.Push [LOCK/SPCH] for 1 sec. to announce the frequency, 
etc. 
q Remove the top and bottom covers as shown 
above. 
w Remove the protective paper attached to the bottom 
of the UT-102 to expose the adhesive strip. 
e Plug UT-102 into J1920 on the MAIN unit as shown 
in the diagram at right. 
r Adjust the trimmer, SPCH LVL: R1925 on the MAIN 
unit, to set the speech level if desired. Refer to the 
illustration at right. 
t Return the top and bottom covers to their original 
positions. 
90
12 OPTION INSTALLATION 
 CR-338 HIGH STABILITY CRYSTAL UNIT 
By installing the CR-338, the total frequency stability 
of the transceiver will be improved. 
q Remove the bottom covers as shown on the previous 
page. 
w Remove the 4 screws from the shield cover of the 
RF unit, and disconnect P2 (CHASSIS) from J761 
(MAIN), then lift up the shield cover. 
e Remove the 8 screws from the RF unit, disconnect 
J1, J121 and J151, then remove the RF unit. 
r Remove the supplied internal crystal and replace 
with the CR-338. 
t Return the RF unit, J1, J121 and J151 to their original 
positions. 
y Connect a frequency counter to the J262, 2LO IN, 
then adjust the reference frequency to be 
64.00000 MHz with the L1901 on the RF unit. 
u Return the J262, shield cover, P2 and bottom covers 
to their original positions. 
TUNER 
(antenna tuner) 
connector 
Blue 
belt 
J151 
Blue 
Soldering 
points 
Connect a frequency counter, then adjust 
the frequency to be 64.00000 MHz. 
91 
Shield cover 
Black belt 
CR-338 
J1 
Black 
J121 
Red 
Red belt 
RF unit 
RF unit 
J262 
2LO IN 
L1901 
P2 
(CHASSIS) 
RF unit 
J761 
(MAIN unit) 
Supplied crystal
 Troubleshooting 
The following chart is designed to help you correct 
problems which are not equipment malfunctions. 
PROBLEM 
Power does not come on . Power cable is improperly connected. 
when the [POWER] switch . Fuse is blown. 
is pushed. 
No sounds come out from . Volume level is too low. 
the speaker. 
Sensitivity is too low, and . The antenna is not connected properly. 
only strong signals are au- . The antenna for another band is selected. 
dible. 
Received audio is unclear .Wrong operating mode is selected. 
or distorted. .PBT function is activated. 
The [ANT] switch does not . The antenna switch has not been activated. 
function 
Transmitting is impossible. .The operating frequency is not set to a ham . Set the frequency to a ham band. 
Output power is too low. 
No contact possible with .RIT or ¡ÓTX function is activated. 
another station. 
Transmit signal is unclear . [MIC GAIN] is set too far clockwise 
or distorted. 
Repeater cannot be ac- . Split frequency or duplex function is not acti- . Push [SPLIT] and/or [F2 DUP] (in M1) to turn pgs. 44, 
cessed. the function ON 
Programmed scan does . Squelch is open. 
not stop. .[RF/SQL] is assigned to RF gain control and . Reset [RF/SQL] control assignment and set it to pgs. 24, 
Programmed scan does .The same frequencies have been programmed .Program different frequencies in scan edge p. 66 
not start. memory channel P1 and P2. 
Memory scan does not .2 or more memory channels have not been . Program more than 2 memory channels. 
start programmed. 
Select memory scan does .2 or more memory channels have not been .Designate more than 2 memory channels as se- p. 72 
not start lect channels for the scan. 
RECEIVE POWER TRANSMIT SCAN 
. The squelch is closed. 
. The transceiver is in transmitting condition. 
. The antenna is not properly tuned. 
. The attenuator is activated. 
. Select a suitable operating mode. 
. Push [PBTC] for 1 sec. to reset the function 
. Noise blanker is turned ON when receiving a . Push [NB] to turn the noise blanker OFF. 
strong signal. 
. Preamp is activated. 
. The noise reduction is activated and the [NR] . Set the [NR] control for maximum readability. 
control is too far clockwise. 
band. 
. [RF PWR] is set too far counterclockwise 
. [MIC GAIN] is set too far counterclockwise 
. The antenna for another band is selected. 
. The antenna is not properly tuned. 
pgs. 48, 
57 
. Split frequency and/or duplex function are acti- .Push [SPLIT] and/or [F2 DUP] (in M1) to turn pgs. 44, 
the function OFF. vated. 
vated. 
. Programmed subaudible tone frequency is . Reset the frequency using set mode. 
wrong. 
squelch is open. 
in scan edge memory channels P1 and P2. 
designated as select channels. 
POSSIBLE CAUSE 
MAINTENANCE 13 
If you are unable to locate the cause of a problem or 
solve it through the use of this chart, contact your nearest 
Icom Dealer or Service Center. 
REF. SOLUTION 
. Re-connect the DC power cable correctly. p. 16 
. Check for the cause, then replace the fuse with p. 93 
the spare one. 
(Fuses are installed in the DC power cable and 
the internal PA unit.) 
. Rotate [AF] clockwise to obtain a suitable lis- p. 23 
tening level. 
. Turn [RF/SQL] to 10 o¡¯clock position to open the p. 24 
squelch. 
. Push [TRANSMIT] to receive or check the p. 25 
SEND line of an external unit, if desired. 
. Re-connect to the antenna connector. . 
. Select an antenna suitable for the operating fre- p. 75 
antenna. 
quency. 
. Push [TUNER] for 1 sec. to manually tune the pgs. 76, 
77 
. Push [P.AMP/ATT] for 1 sec. to select ¡°ATT OFF.¡± p. 48 
p. 23 
p. 52 
p. 51 
.Push [P.AMP/ATT] once or twice to turn the p. 48 
function OFF. 
p. 53 
. Set the antenna switch in set mode to ¡°Auto¡± or p. 85 
¡°Manual.¡± 
p. 19 
. Rotate [RF PWR] clockwise. p. 25 
. Set [MIC GAIN] to a suitable position. p. 25 
. Select an antenna suitable for the operating fre- p. 75 
quency. 
.Push [TUNER] for 1 sec. to manually tune the pgs. 76, 
antenna. 77 
. Push [RIT] or [¡ÓTX] to turn the function OFF. 
59 
. Set [MIC GAIN] to a suitable position. p. 25
59 
p. 45 
. Set [RF/SQL] to the threshold point. p. 24 
the threshold point. 82 
p. 63 
92
13 MAINTENANCE 
POSSIBLE CAUSE PROBLEM 
The displayed frequency • The dial lock function is activated. 
does not change properly. • A set mode screen is selected. 
• The internal CPU has malfunctioned. 
 Fuse replacement 
If a fuse blows or the transceiver stops functioning, try 
to find the source of the problem, and replace the damaged 
fuse with a new, rated fuse. 
The IC-746PRO has 2 types of fuses installed for 
transceiver protection. 
• DC power cable fuses ................................FGB 30 A 
• Circuitry fuse ................................................FGB 5 A 
DDC power cable fuse replacement 
Refer the figure illustrated at right for the DC power 
cable fuse replacement. 
DCircuitry fuse replacement 
The 13.8 V DC from the DC power cable is applied to 
all units in the IC-746PRO, except for the power amplifier, 
through the circuitry fuse. This fuse is installed in 
the PA unit. 
q Remove the top cover as shown on p. 90. 
w Remove the 11 screws from the PA shielding plate, 
then remove the plate. 
e Replace the circuitry fuse as shown in the diagram 
at right. 
r Replace the PA shielding plate and top cover. 
 Tuning dial brake adjustment 
The tension of the tuning dial may be adjusted to suit 
your preference. 
The brake adjustment screw is located on the right 
side of the tuning dial. See the figure at right. 
Turn the brake adjustment screw clockwise or counterclockwise 
to obtain a comfortable tension level while 
turning the dial continuously and evenly in one direction. 
DISPLAY 
93 
REF. SOLUTION 
p. 53 • Push [LOCK/SPCH] to turn the function OFF. 
• Push [MENU] several times to exit the set — 
mode. 
• Reset the CPU. p. 94 
CAUTION: DISCONNECT the DC power cable 
from the transceiver when changing a fuse. 
30 A 
fuse 
Fuse 
Light 
Heavy
 Resetting the CPU 
When first applying power or when the function does 
not seem to be operating normally, reset the CPU as 
follows: 
q Make sure the transceiver power is OFF. 
w While pushing [M-CL] and [F-INP], push [POWER] 
for 1 sec. to turn power ON. 
. The internal CPU is reset. 
. The transceiver displays its initial VFO frequency when 
resetting is complete. 
e Correct the set mode settings after resetting, if desired. 
NOTE: Resetting CLEARS all programmed contents 
in memory channels and returns programmed 
values in set mode to default values. 
 Frequency calibration (approximate) 
A very accurate frequency counter is required to calibrate 
the frequency of the transceiver. However, a 
rough check may be performed by receiving radio station 
WWV, or other standard frequency signals. 
CAUTION: Your transceiver has been thoroughly 
adjusted and checked at the factory before being 
shipped. You should not calibrate frequencies, except 
for special reasons. 
q Push [SSB] to select USB mode. 
w Push [PBTC] for 1 sec. to clear the PBT settings 
and make sure that the RIT/¡ÓTX function is not activated. 
e Set the frequency to the standard frequency station 
minus 1 kHz. 
.When receiving WWV (10.000.00 MHz) as a standard 
frequency, set the operating frequency for 9.999.00 MHz. 
. Other standard frequencies can also be used. 
r Push [MENU] several times to select M1 or M2, if 
necessary. 
t Push [MENU] for 1 sec. to select the set mode 
screen. 
y Push [F1 ¡Â] or [F2 ¡Ã] several times to select the 
CAL. Marker item. 
u Rotate the tuning dial clockwise to turn the calibration 
marker ON. 
. Side tone may be heard. 
i Adjust [CAL] pot on the rear side of the transceiver 
for a zero beat with the received standard signal. 
. Zero beat means that two signals are exactly the same 
frequency, resulting in a single tone being emitted. 
o Rotate the tuning dial counterclockwise to turn the 
calibration marker OFF. 
!0 Push [MENU] to exit set mode. 
[POWER] 
[MENU] [SSB] 
[RF/SQL] [AF] [P.AMP/ATT] 
. Calibration marker item 
CAL. Marker 
5 
[CAL] 
MAINTENANCE 13 
[F-INP] [M-CL] 
[PBTC] 
[RIT] [CLEAR] 
ON 
94
14 CONTROL COMMAND 
 Remote jack (CI-V) information 
.Data format 
The CI-V system can be operated using the following 
data formats. Data formats differ according to command 
numbers. A data area or sub command is added 
for some commands. 
Controller to IC-746PRO 
FE FE 66 
FE FE E0 
IC-746PRO to controller 
Preamble 
code (fixed) 
.CI-V connection example 
The transceiver can be connected through an optional 
CT-17 CI-V LEVEL CONVERTER to a personal computer 
equipped with an RS-232C port. The Icom Communications 
Interface-V (CI-V) controls the following functions 
of the transceiver. 
Up to 4 Icom CI-V transceivers or transceivers can be 
connected to a personal computer equipped with an 
RS-232C port. See p. 88 for setting the CI-V condition 
using set mode.
q w e r t y 
q w e r t y 
Transceiver¡¯s 
default address 
Controller¡¯s 
default address 
E0 
66 
Send frequency data 
Send mode data 
Read band edge frequencies 
Read operating frequency 
Read operating mode 
Set operating frequency 
Select LSB 
Select USB 
Select AM 
Select CW 
Select RTTY 
Select FM 
Select CW-R 
Select RTTY-R 
Select VFO mode 
Select VFO A 
Select VFO B 
Equalize VFO A and VFO B 
.Command table 
Command 
00 
01 
02 
03 
04 
05 
06 
07 
Sub command 
. 
Same as 
command 06 
.
.
.
.
00 
01 
02 
03 
04 
05 
07 
08 
.
00 
01 
A0 
Command number 
Data area Sc Cn 
Data area Sc Cn 
Description 
(see the command table) 
Sub command number 
(see command table) 
BCD code data for 
frequency or memory 
number entry 
95 
End of message 
code (fixed) 
IC-746PRO 
u
FD 
FD
u
Command 
07 
08 
09 
0A 
0B 
0C 
0D 
0E 
FE FE E0 
FE FE E0 
Sub command 
B0 
. 
0001.0101* 
0102 
.
.
.
.
. 
mini-plug cable 
OK message to controller 
NG message to controller 
Transceiver¡¯s 
default address 
ct- 17 
FB 66 
FA 66 
Description 
Exchange VFO A and VFO B 
Select memory mode 
Select memory channel 
*P1=0100, P2=0101 
Select the call channel 
Memory write 
Memory to VFO 
Memory clear 
Read offset frequency 
Set offset frequency 
Scan stop 
Programmed/memory scan start 
Programmed scan start 
¡ÓF scan start 
Fine programmed scan start 
Fine ¡ÓF scan start 
Memory scan start 
Select memory scan start 
NG code OK code 
(fixed) (fixed)
Preamble 
code (fixed) 
00 
01 
02 
03 
12 
13 
22 
23 
Controller¡¯s 
default address 
BC-25 
(optional) 
9.15 V 
DC 
End of message 
code (fixed) 
personal 
computer 
FD 
FD
.Command table (continued) 
Command 
0E 
0F 
10 
11 
12 
13 
14 
15 
16 
Sub command 
A1.A7 
B0 
B1 
D0 
D3 
00 
01 
10 
11 
12 
00 
01 
02 
03 
04 
05 
06 
07 
08 
.
.
00 
01 
02 
01 
02 
11 
12 
13 
02 
Set ¡ÓF scan span (A1=¡¾5 kHz, 
A2=¡¾10 kHz, A3=¡¾20 kHz, 
A4=¡¾50 kHz, A5=¡¾100 kHz, 
A6=¡¾500 kHz, A7=¡¾1 MHz) 
Set as non-select channel 
Set as select channel 
Set scan resume OFF 
Set scan resume ON 
Turn the split function OFF 
Turn the split function ON 
Select simplex operation 
Select .DUP operation 
Select +DUP operation 
Select 10 Hz (1 Hz) tuning step 
Select 100 Hz tuning step 
Select 1 kHz tuning step 
Select 5 kHz tuning step 
Select 9 kHz tuning step 
Select 10 kHz tuning step 
Select 12.5 kHz tuning step 
Select 20 kHz tuning step 
Select 25 kHz tuning step 
Select/read attenuator (0=OFF, 
1=ON) 
Select/read antenna selection 
(0=ANT1, 1=ANT2) 
Announce with voice synthesizer 
(00=all data; 01=frequency and 
S-meter level; 02=receive mode) 
01 + Level data [AF] level setting (0=max. CCW to 
255=max. CW) 
02 + Level data [RF] level setting (0=max. CCW to 
255=11 o¡¯clock) 
03 + Level data [SQL] level setting (0=11 o¡¯clock to 
255=max. CW) 
06 + Level data [NR] level setting (0=min. to 
255=max.) 
07 + Level data Inside [TWIN PBT] setting or IF 
shift setting (0=max. CCW, 
128=center, 255=max. CW) 
08 + Level data Outside [TWIN PBT] setting 
(0=max. CCW, 128=center, 
255=max. CW) 
09 + Level data [CW PITCH] setting (0=300 Hz, 
128=600 Hz, 255=900 Hz) 
0A + Level data [RF PWR] setting (0=mini. to 
255=max.) 
0B + Level data [MIC GAIN] setting (0=mini. to 
255=max.) 
0C + Level data [KEY SPEED] setting (0=slow to 
255=fast) 
0D + Level data [NOTCH] setting (0=low freq. to 
255=high freq.) 
0E + Level data COMP Level Delay setting (0=0 to 
10=10) 
0F + Level data Break-IN DELAY setting (20=2.0d 
to 130=13.0d) 
Read squelch condition 
Read S-meter level 
Read RF power meter 
Read SWR meter 
Read ALC meter 
Preamp (0=OFF; 1=preamp 1; 
2=preamp 2) 
Description Sub command Command 
12 16 
22 
40 
41 
42 
43 
44 
45 
46 
47 
19 
48 
49 
4B 
4C 
00 
00 1A 
01 
02 
03 
04 
0501 
0502 
0503 
0504 
0505 
0506 
0507 
0508 
0509 
0510 
0511 
0512 
0513 
0514 
0515 
0516 
CONTROL COMMAND 14 
Description 
AGC selection (0=OFF; 1=Slow; 
2=Mid; 3=Fast) 
Noise blanker (0=OFF; 1=ON) 
Noise reduction (0=OFF; 1=ON) 
Auto notch (0=OFF; 1=ON) 
Repeater tone (0=OFF; 1=ON) 
Tone squelch (0=OFF; 1=ON) 
Speech compressor (0=OFF; 1=ON) 
Monitor (0=OFF; 1=ON) 
VOX function (0=OFF; 1=ON) 
Break-in (0=OFF; 1=semi breakin; 
2=full break-in) 
Manual notch (0=OFF; 1=ON) 
RTTY filter (0=OFF; 1=ON) 
DTCS (0=OFF; 1=ON) 
VSC (0=OFF; 1=ON) 
Read the transceiver ID 
Send/read memory contents (see 
p. 97 for details) 
Send/read band stacking register 
contents (see p. 97 for details) 
Send/read memory keyer contents 
(see p. 97 for details) 
Send/read the selected filter width 
(0=50 Hz to 40/31=3600/2700 Hz) 
Send/read the selected AGC time 
constant (0=OFF, 1=0.1/0.3 sec. to 
13=6.0/8.0 sec.) 
Send/read LCD contrast (0=0% to 
255=100%) 
Send/read LCD backlight (0=0% to 
255=100%) 
Send/read beep gain (0=min. to 
255=max.) 
Send/read beep gain limit (0=OFF, 
1=ON) 
Send/read calibration marker 
(0=OFF, 1=ON) 
Send/read confirmation beep 
(0=OFF, 1=ON) 
Send/read band edge beep 
(0=OFF, 1=ON) 
Send/read RF/SQL control set 
(0=Auto, 1=SQL, 2=RF+SQL) 
Send/read meter peak hold set 
(0=OFF, 1=ON) 
Send/read COMP meter set 
(0=OFF, 1=ON) 
Send/read quick split set (0=OFF, 
1=ON) 
Send/read split offset .9.999 to 
+9.999 MHz (see p. 98 for details) 
Send/read split lock set (0=OFF, 
1=ON) 
Send/read duplex offset 0.000 to 
9.999 MHz for HF (see p. 98 for 
details) 
Send/read duplex offset 0.000 to 
9.999 MHz for 50 MHz band (see 
p. 98 for details) 
Send/read duplex offset 0.000 to 
9.999 MHz for 144 MHz band 
(see p. 98 for details) 
96
14 CONTROL COMMAND 
.Command table (continued) 
Sub command Command 
0517 1A 
0518 
0519 
0520 
0521 
0522 
0523 
0524 
0525 
0526 
0527 
0528 
0529 
0530 
0531 
0532 
0533 
0534 
0535 
0536 
0537 
0538 
0539 
0540 
0541 
0542 
0543 
0544 
0545 
0546 
0547 
Description 
Send/read one touch repeater set 
(0=DUP., 1=DUP+) 
Send/read auto repeater set 
(0=OFF, 1=ON-1, 2=ON-2) 
Send/read tuner auto start set 
(0=OFF, 1=ON) 
Send/read PTT tune set (0=OFF, 
1=ON) 
Send/read 9600 bps mode set 
(0=OFF, 1=ON) 
Send/read antenna selection 
(0=OFF, 1=Manual, 2=Auto) 
Send/read speech language 
(0=English, 1=Japanese) 
Send/read speech speed (0=Slow, 
1=Fast) 
Send/read S-level speech (0=OFF, 
1=ON) 
Send/read memo pad numbers 
(0=5 ch, 1=10 ch) 
Send/read main dial auto TS 
(0=OFF, 1=Low, 2=High) 
Send/read mic. up/down speed 
(0=Low, 1=High) 
Send/read quick RIT/¡ÓTX clear 
function (0=OFF, 1=ON) 
Send/read PBT shifting value 
popup set (0=OFF, 1=ON) 
Send/read IF filter width popup 
set (0=OFF, 1=ON) 
Send/read SSB/CW synchronous 
tuning function (0=OFF, 1=ON) 
Send/read CW normal side set 
(0=LSB, 1=USB) 
Send/read keyer 1st menu set 
(0=Keyer-root, 1=Keyer-send) 
Send/read external keypad set 
(0=OFF, 1=Keyer send) 
Send/read CI-V transceive set 
(0=OFF, 1=ON) 
Send/read CI-V 731 mode set 
(0=OFF, 1=ON) 
Send/read speech compressor 
level set (0=0 to 10=10) 
Send/read SSB TX Tone (Bass) 
level (0 =.5 to 10=+5) 
Send/read SSB TX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read SSB RX Tone (Bass) 
level (0 =.5 to 10=+5) 
Send/read SSB RX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read AM TX Tone (Bass) 
level (0 =.5 to 10=+5) 
Send/read AM TX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read AM RX Tone (Bass) 
level (0 =.5 to 10=+5) 
Send/read AM RX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read FM TX Tone (Bass) 
level (0 =.5 to 10=+5) 
97 
Sub command Command 
0548 1A 
0549 
0550 
0551 
0552 
0553 
0554 
0555 
0556 
0557 
0558 
0559 
0560 
0561 
0562 
Send/read count up trigger channel 
(1=M1, 2=M2, 3=M3, 4=M4) 
Send/read present number 
(1.9999) 
Send/read CW side tone gain 
(0=min. to 255=max.) 
Send/read CW side tone gain limit 
(0=OFF, 1=ON) 
Send/read CW keyer repeat time 
(1=1 sec. to 60=60 sec.) 
Send/read CW keyer dot/dash 
ratio (28=1:1:2.8 to 45=1:1:4.5) 
Send/read rise time (0=2 msec., 
1=4 msec., 2=6 msec., 3=8 msec.) 
Send/read paddle polarity 
(0=Normal, 1=Reverse) 
Send/read keyer type (0=Straight, 
1=Bug-key, 2=ELEC-Key) 
Send/read mic. up/down keyer set 
(0=OFF, 1=ON) 
Send/read RTTY filter bandwidth 
(0=250 Hz, 1=300 Hz, 2=350 Hz, 
3=500 Hz, 4=1 kHz) 
0563 Send/read twin peak filter (0=OFF, 
0564 
0565 
0566 
0567 
0568 
0569 
0570 
0571 
0572 
0573 
0574 
0575 
0576 
Description 
Send/read FM TX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read FM RX Tone (Bass) 
level (0 =.5 to 10=+5) 
Send/read FM RX Tone (Treble) 
level (0=.5 to 10=+5) 
Send/read contact number style 
(0=Normal, 1=190¡æANO, 
2=190¡æANT, 3=90¡æNO, 
4=90¡æNT) 
1=ON) 
Send/read RTTY mark frequency 
(0=1275 Hz, 1=1615 Hz, 
2=2125 Hz) 
Send/read RTTY shift width 
(0=170 Hz, 1=200 Hz, 2=425 Hz) 
Send/read RTTY keying polarity 
(0=Normal, 1=Reverse) 
Send/read RTTY decode USOS 
(0=OFF, 1=ON) 
Send/read RTTY decode new line 
code (0=CR,LF,CR+LF, 1=CR+LF) 
Send/read number of RTTY decoder 
line (0=2 lines, 1=3 lines) 
Send/read scan speed (0=Low, 
1=High) 
Send/read scan resume (0=OFF, 
1=ON) 
Send/read NB level (0=0% to 
255=100%) 
Send/read VOX gain (0=0% to 
255=100%) 
Send/read anti VOX gain (0=0% to 
255=100%) 
Send/read VOX delay (0=0.0 sec. 
to 20=2.0 sec.) 
Send/read Break-IN delay set 
(20=2.0d to 130=13.0d)
•Command table (continued) 
Command Sub command 
1A 
1B 
1C 
0577 
06 
07 
08 
00 
01 
02 
00 
01 
D To send/read memory contents 
When sending or reading memory contents, additional code 
as follows must be added to appoint the memory channel. 
.Additional code: 0000–0102 (0100=P1, 0101=P2, 0102=Call) 
D Band stacking register 
To send or read the desired band stacking register ’s contents, 
combined code of the frequency band and register 
codes as follows are used. 
For example, when sending/reading the oldest contents in 
the 21 MHz band, the code “0703” is used. 
•Frequency band code 
Code Frequency band Frequency range (unit: MHz) 
1.8 
3.5 
7 
10 
14 
18 
21 
24 
28 
50 
144 
GENE 
01 
02 
03 
04 
05 
06 
07 
08 
09 
10 
11 
12 
• Register code 
Registered number Code 
01 
02 
03 
Description 
Send/read MONITOR level (0=0% 
to 255=100%) 
Send/read DATA mode (0=OFF, 
1=ON) 
Send/read SSB transmit bandwidth 
(0=WIDE, 1=MID, 2=NAR) 
Send/read DSP filter shape 
(0= sharp, 1= soft) 
Set/read repeater tone frequency 
(see p. 98 for details) 
Set/read TSQL tone frequency 
(see p. 98 for details) 
Set/read DTCS code and polarity 
(see p. 98 for details) 
Set/read the transceiver’s condition 
(0=Rx; 1=Tx) 
Set/read antenna tuner condition 
(0=OFF, 1=ON, 2=Start tuning or 
while tuning) 
1.800000– 1.999999 
3.400000– 4.099999 
6.900000– 7.499999 
9.900000–10.499999 
13.900000–14.499999 
17.900000–18.499999 
20.900000–21.499999 
24.400000–25.099999 
28.000000–29.999999 
50.000000–54.000000 
144.000000–148.000000 
Other than above 
1 (latest) 
2 
3 (oldest) 
CONTROL COMMAND 14 
D Codes for memory keyer contents 
To send or read the desired memory keyer contents, the 
channel and character codes as follows are used. 
• Channel code 
Code Channel number 
M1 
M2 
M3 
M4 
01 
02 
03 
04 
• Character’s code 
Character ASCII code Description 
space 
/
?
,
.
^ 
20 
2F 
3F 
2C 
2E 
5E 
2A . 
0–9 30–39 Numerals 
A–Z 41–5A Alphabetical characters 
Word space 
Symbol 
Symbol 
Symbol 
Symbol 
e.g., to send BT, enter ^4254 
Inserts contact number (can be 
used for 1 channel only) 
D Codes for memory name contents 
To send or read the desired memory name settings, the character 
codes, instructed codes for memory keyer contents as 
above, and follows are additionally used. 
• Character’s code— Alphabetical characters 
ASCII code Character ASCII code Character 
— — a–z 61–7A 
• Character’s code— Symbols 
ASCII code Character ASCII code Character 
27 ’ 
5C 
22 
60 
2D 
! 21 # 23 
$ 24 % 25 
& 26 ¥ 
? 3F ”
` 
+ 2B – 
: 3A ; 3B 
= 3D < 3C 
> 3E ( 28 
) 29 [ 5B 
] 5D { 7B 
} 7D | 7C 
_ 5F – 7E 
98
14 CONTROL COMMAND 
D Split/Duplex frequency setting 
The following data sequence is used when sending/reading 
the split or duplex frequency setting. 
q w e r*
XX X X 0 X X 0 
*No need to enter for duplex frequency setting. 
D Repeater tone/tone squelch frequency setting 
The following data sequence is used when sending/reading 
the DTCS code and polarity setting. 
w e q* 
0 X X 0 X X 
*Not necessary when setting a frequency. 
D DTCS code and polarity setting 
The following data sequence is used when sending/reading 
the DTCS code and polarity setting. 
w e 
X 0 X X X X 
1 kHz digit: 0—9 
Transmit polarity: 
Fixed digit: 0* 0= Normal 
1= Reverse 100 Hz digit: 0 (fixed) 
Receive polarity: 
Fixed digit: 0* 0= Normal 
1= Reverse 100 kHz digit: 0—9 
100Hz digit: 0–2 Fixed digit: 0 
10 kHz digit: 0—9 
10 Hz digit: 0–9 1st digit: 0–7 
10 MHz digit: 0 (fixed) 
1 Hz digit: 0–9 2nd digit: 0–7 
1 MHz digit: 0—4 
0.1 Hz digit: 0–9 3rd digit: 0–7 
01=— direction 
q 
99 
Direction: 
00=+ direction
(Unit: MHz) 
1.800. 
3.500. 
7.000. 
0.030. 60.000000* 
108.000. 174.000000* 
2.000000 
3.999999 
7.300000 
10.100. 10.150000 
14.000. 14.350000 
18.068. 18.168000 
21.000. 21.450000 
24.890. 24.990000 
28.000. 29.700000 
50.000. 54.000000 
144.000. 148.000000 
: USB, LSB, CW, RTTY, AM, FM 
: 102 (99 regular, 2 scan edges and 1 
call) 
: 13.8 V DC ¡¾15% (negative ground) 
: 
23.0 A 
2.2 A 
Max. power 
Standby 
Max. audio 3.0 A 
: 287(W)¡¿120(H)¡¿316.5(D) mm 
135.16(W)¡¿423.32(H)¡¿1215.32(D) in 
.General 
.Frequency coverage : 
Receive 
Transmit 
*Some frequency ranges are not guaranteed. 
.Mode 
. No. of memory ch. 
. Antenna connector 
. Frequency stability 
: SO-239¡¿3 (2 for HF/50 MHz and 1 
for 144 MHz; 50 §Ù) 
. Operating temp. range : .10¡ÆC to +60¡ÆC ; +14¡ÆF to +140¡ÆF 
: Less than ¡¾7 ppm from 1 min. to 
60 min. after power ON. After 
that, rate of stability is less than 
¡¾1 ppm/hr. at 25¡ÆC (+77¡ÆF). 
Temperature fluctuations 0¡ÆC to 
+50¡ÆC (+20¡ÆF to +122¡ÆF) less than 
¡¾5 ppm. 
. Frequency resolution : 1 Hz 
.Power supply 
.Power consumption 
Transmit 
Receive 
.Dimensions 
(projections not incl.) 
.Weight (approx.) 
.ACC 1 connector 
.ACC 2 connector 
.DATA connector 
. CI-V connector 
: 9.0 kg; 19 lb 13 oz 
: 8-pin DIN connector 
: 7-pin DIN connector 
: Mini DIN 6-pin 
: 2-conductor 3.5 (d) mm (1.8¡È) 
Less than 5 to 100 W 
Less than 5 to 40 W 
: 
PSN modulation 
Low power modulation 
Phase modulation 
: 50 dB (HF bands) 
60 dB (50/144 MHz) 
.Transmitter 
. Output power (continuously adjustable): 
SSB/CW/RTTY/FM 
AM 
. Modulation system 
SSB 
AM 
FM 
. Spurious emission 
. Carrier suppression : 40 dB 
.Unwanted sideband : 55dB 
suppression 
.¡ÓTX variable range : ¡¾9.99 kHz 
. Mic. connector : 8-pin connector (600 §Ù) 
.ELEC-KEY connector : 3-conductor 6.35(d) mm (1.4¡È) 
.KEY connector : 3-conductor 6.35(d) mm (1.4¡È) 
.SEND connector : Phono (RCA) 
. ALC connector : Phono (RCA) 
SPECIFICATIONS 15 
: Triple conversion 
superheterodyne system 
64.455 MHz 
455 kHz 
36 kHz 
: 
0.25 ¥ìV*2 (50 MHz) 
Less than 5.6 ¥ìV 
Less than 1.0 ¥ìV 
: 
More than 2.4 kHz/.6 dB 
Less than 3.6 kHz/.60 dB 
More than 500 Hz/.6 dB 
Less than 700 Hz/.60 dB 
More than 360 Hz/.6 dB 
Less than 650 Hz/.60 dB 
More than 6.0 kHz/.6 dB 
Less than 15.0 kHz/.60 dB 
More than 12.0 kHz/.6 dB 
Less than 20.0 kHz/.60 dB 
More than 70 dB (except IF through 
on 50 MHz band) 
More than 60 dB 
: More than 2.0 W at 10% distortion 
with an 8 §Ù load 
: ¡¾9.99 kHz 
: 3-conductor 6.35 (d) mm (1.4¡È) 
: 2-conductor 3.5 (d) mm (1.8¡È)/8§Ù 
.Receiver 
.Receive system 
. Intermediate frequencies: 
1st 
2nd 
3rd 
. Sensitivity (typical) 
SSB, CW, RTTY 
(10 dB S/N) 
0.16 ¥ìV*1 (1.80.29.99 MHz) 
0.13 ¥ìV*2 (50 MHz) 
0.11 ¥ìV*3 (144 MHz) 
AM (10 dB S/N) 13 ¥ìV (0.5.1.799 MHz) 
2 ¥ìV*1 (1.80.29.99 MHz) 
1 ¥ìV (50*2/144*3 MHz) 
FM (12 dB SINAD) 0.5 ¥ìV*1 (28.0.29.99 MHz) 
0.18 ¥ìV*3 (144 MHz) 
*1Pre-amp 1 is ON, *2Pre-amp 2 is ON, *3Pre-amp is ON 
. Squelch sensitivity (Pre-amp: OFF): 
SSB, CW, RTTY 
FM 
. Selectivity 
SSB (BW: 2.4 kHz) 
CW (BW: 500 Hz) 
RTTY (BW: 350 Hz) 
AM (BW: 6 kHz) 
FM (BW: 15 kHz) 
. Spurious and image rejection ratio: 
HF/50 MHz 
144 MHz 
.AF output power 
(at 13.8 V DC) 
.RIT variable range 
.PHONES connector 
. Ext. SP connector 
: 8 W (HF bands) 
15 W (50 MHz band) 
: VSWR 1.5:1 or less 
: Less than 1.0 dB (after tuning) 
.Antenna tuner 
HF bands 
50 MHz band 
. Matching impedance range: 
16.7 to 150 §Ù unbalanced 
(Less than VSWR 3:1) 
20 to 125 §Ù unbalanced 
(Less than VSWR 2.5:1) 
. Minimum operating input power 
.Tuning accuracy 
. Insertion loss 
All stated specifications are typical and subject to change without notice 
or obligation. 
100
16 OPTIONS 
IC-PW1 HF/50 MHz ALL BAND 1 kW LINEAR AMPLIFIER 
Full-duty 1 kW linear amplifier including an automatic antenna tuner. Has 
automatic tuning and band selection capability. Full break-in (QSK) operation 
is possible. The amplifier/power supply unit and the remote control 
unit are separated. 
AH-4 HF/50 MHz AUTOMATIC 
ANTENNA TUNER 
Specially designed to tune a long 
wire antenna for portable or mobile 
HF operation. The PTT tuner start 
function provides simple operation. 
. Input power rating: 120 W 
SP-21 EXTERNAL SPEAKER 
Designed for base station operation. 
. Input impedance: 8 §Ù 
. Max. input power: 5 W 
101 
AH-2b ANTENNA ELEMENT 
A 2.5 m long antenna 
element for 
mobile operation 
with the AH-4. 
.Frequency 
coverage: 
7.54 MHz bands 
with the AH-4 
CT-17 CI-V LEVEL CONVERTER 
For remote transceiver control 
using a personal computer. You 
can change frequencies, operating 
mode, memory channels, etc. 
PS-125 DC POWER SUPPLY 
Light weight switching regulator 
system power supply. 
. Output voltage: 13.8 V DC 
. Max. current drain: 25 A 
SM-20 DESKTOP MICROPHONE 
Unidirectional, electret microphone 
for base station operation. Includes 
[UP]/[DOWN] switches and a low 
cut function. 
UT-102 VOICE SYNTHESIZER UNIT 
Announces the receive frequency, mode 
and S-meter level in a clear, electronically-
generated voice, in English (or 
Japanese). 
SP-20 EXTERNAL SPEAKER 
4 audio filters; headphone jack; can connect 
to 2 transceivers. 
. Input impedance: 8 §Ù 
. Max. input power: 5 W 
CR-338 HIGH STABILITY CRYSTAL 
UNIT 
Contains a temperature-compensating 
oven heater and crystal unit for improved 
frequency stability. 
. Frequency stability: ¡¾0.5 ppm 
HM-36 HAND MICROPHONE 
Hand microphone equipped with 
[UP]/[DOWN] switches.
A-6085H-1US-w 
Printed in Japan 
© 2001, 2002 Icom Inc. 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003 Japan