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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.
NEVER apply AC to the [DC13.8V] jack on the transceiver rear panel. This could cause a fire or ruin the
transceiver.
NEVER 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.
NEVER 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 ¡Ý] 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 ¡Ý] [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/ÝTX CONTROL [RIT/ÝTX] (pgs. 48, 57)
Shifts the receive and/or transmit frequency without
changing the transmit and/or receive frequency
while the RIT and/or ÝTX 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/ÝTX
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/ÝTX] 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/ÝTX 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 ÝTX SWITCH [ÝTX] (p. 57)
.Turns the ÝTX function ON and OFF when
pushed.
. Use the [RIT/ÝTX] control to vary the ÝTX frequency.
.Adds the ÝTX shift frequency to the operating
frequency when pushed for 1 sec.
.What is the ÝTX function?
The ÝTX 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 ÝTX
RIT/ÝTX
%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 ÝTX
RIT/ÝTX
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 ÝTX
RIT/ÝTX
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
. ÝTX function
The ÝTX 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 [ÝTX] switch to turn the ÝTX function ON
and OFF.
. gÝTXh and shift frequency appear when the function is
ON.
w Rotate the [RIT/ÝTX] control.
.To reset the ÝTX frequency, push [CLEAR] for 1 sec.
. Push [CLEAR] momentarily to reset the ÝTX frequency
when the quick RIT clear function is ON. (p. 86)
.To add or subtract the ÝTX frequency to the displayed
frequency, push [ÝTX] for 1 sec.
When RIT and ÝTX are ON at the same time, the
[RIT/ÝTX] control shifts both the transmit and receive
frequencies from the displayed frequency at
the same time.
DÝTX monitor function
When the ÝTX function is ON, pushing and holding
[XFC] allows you to monitor the operating frequency directly
(ÝTX 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]
[ÝTX] [RIT/ÝTX] 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]
ÝF:}1Ok
PRO ÝF FIN SPN SET
F 1 F 5 F 2 F 3 F 4
Push [F1]
PROG SCAN
PRO ÝF FIN SPN SET
F 1
Push [F1] to start/cancel the scanning.
F 5 F 2 F 3 F 4
PROG SCAN
PRO ÝF 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 ÝF 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 ÝF SEL SPN SET
F 5 F 2 F 3 F 4 F 1
Push [F1] to start/cancel the scanning.
MEMO SCAN
MEM ÝF 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 ÝF SEL SPN SET
F 5 F 2 F 3 F 4 F 1
. Scan menu
ÝF:}1Ok
MEM ÝF 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
. ÝF scan operation and Fine ÝF scan
ÝF 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 ÝF 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 ÝF 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 ÝF] to start the ÝF 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 ÝF] to cancel the ÝF scan.
. Rotating the tuning dial during scan also cancels scan
operation.
DAbout the Fine ÝF scan
During ÝF 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 ÝF scan, push [F3 FIN] to switch between
ÝF scan and fine ÝF scan operation.
e Push [F2 ÝF] 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]
ÝF:}1Ok
PRO ÝF FIN SPN SET
F 5 F 2 F 3 F 4 F 1
Push [F2] Push [F4] to select the span.
ÝF SCAN
PRO ÝF FIN SPN SET
F 5 F 2 F 3 F 4 F 1
Push [F2] to start/cancel the scanning.
ÝF SCAN
PRO ÝF 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-ÝF SCAN
PRO ÝF 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 ¡Ý] 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/ÝTX frequency clearing instruction
with [PBTC].
ON : Clears the RIT/ÝTX frequency when
[PBTC] is pushed momentarily.
: Clears the RIT/ÝTX 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

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