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PRO-51 (200-0308)
Specifications
Faxback Doc. # 7495
GENERAL

Band coverage: 12 bands plus weather channels
Frequency range:
29 to 29.7 MHz (10 meter amateur band)
29.7 to 50 MHz (VHF low band)
50 to 54 MHz (6 meter amateur band)
108 to 136.975 MHz (Aircraft band)
137 to 144 MHz (Military land mobile)
144 to 148 MHz (2 meter amateur band)
148 to 174 MHz (VHF high band)
406 to 420 MHz (Federal government land mobile)
420 to 450 MHz (70-cm amateur band)
450 to 470 MHz (UHF standard band)
470 to 512 MHz (UHF "T" band)
806 to 956 MHz (Public service except cellular band)

Weather service channels:
162.400 MHz 162.500 MHz
162.425 MHz 162.525 MHz
162.450 MHz 162.550 MHz
162.475 MHz
Number of programmable Channels: 200 channels (20CH x 10 banks)
Display: 10-Digit LCD with mode indicators (with back light)
(BANK 1 - 10, SCAN, MAN, PGM, PRI, L/O, DLY, WX,
SRCH, up-arrow, down-arrow, P, KEYLOCK, BATT.LO).
Keys (PROGRAM): Total 1 set 12 keys
"0" to "9": Numeric keys
ENTER: Enter key
./DELAY: Decimal/Delay key
(0-9 Keys work for Bank Selection in Scan Mode)
(OPERATION) Total 14 keys
SCAN: Scan key
MANUAL: Manual key
L/OUT: Lockout key
./DELAY: Decimal/Delay key
LIMIT: Limit key
PRIORITY: Priority key
BAND: Band key
up-arrow, down-arrow: Search direction keys
LIGHT: Light key
PROG: Program key
MONI: Monitor key
CLEAR: Clear key
K/L: Keylock key
Controls/Switches: VOLUME control with power ON/Off switch
SQUELCH control

External Jacks: ANT.jack: BNC type
Earphone jack: 3.5 mm dia.
DC power jack: 3.3 mm dia.
DC charge jack: 3.3 mm dia.
Internal Speaker: 8-ohm, 1 W (36 mm dia.)
Power requirements: 4-AA Size Standard Batteries 6.0 V DC
4-AA Size Nickel-Cadmium Batteries 4.8 V DC
AC Adapter 9V DC 300 mA output (273-1665)
DC Adapter 6.0 V DC (270-1560)

Operating Temperature: -4 degrees F - 140 degrees F (-20 degrees C - +60 degrees C)
Storage Temperature: -22 degrees F - 149 Degrees (-30 degrees C - + 65 degrees C)
Dimensions (HWD): 6 1/16 x 2 7/16 x 1 11/16 inches (154 x 62 x 42.5 mm)
Weight: 8.11 oz (230 g)

Accessories: Flexible antenna
Belt clip

Heterodyne system: 1. 1st heterodyne (IF 10.80 MHz)
VHF low band: Upper heterodyne
Aircraft: Upper heterodyne
VHF high band: Lower heterodyne
Public service band: Lower heterodyne
2. 2nd heterodyne (IF 450 kHz)
All bands are lower heterodyne

Filter: Monolithic crystal filter 10.80 MHz
Ceramic filter 450 kHz

PERFORMANCES
Measurement Conditions
Power source: 6.0 V DC
Antenna impedance: 50 ohm
Test temperature: 77 degrees F (25 degrees C)
Modulation frequency: 1 kHz
Deviation: FM +/-3 kHz dev./AM 60% for aircraft band
Mean signal input level: 100 microV
Audio output load: 8-ohm resistive load
Standard ref. audio output: 50 mW (0.63 V)
Item Unit Nominal Limit
Sensitivity (S+N)/N=20dB
VHF low band: 30.0 MHz microV 0.5 2.0
40.0 MHz microV 0.5 2.0
50.0 MHz microV 0.5 2.0
VHF high band 140.0 MHz microV 0.6 3.0
155.0 MHz microV 0.6 3.0
170.0 MHz microV 0.6 3.0
UHF band 410.0 MHz microV 0.5 4.0
460.0 MHz microV 0.5 4.0
510.0 MHz microV 0.5 4.0
Aircraft 118.0 MHz microV 1.3 8.0
127.0 MHz microV 1.3 8.0
135.0 MHz microV 1.3 8.0
+
Public service band 810.0 MHz microV 0.7 5.0
860.0 MHz microV 0.7 5.0
950.0 MHz microV 0.7 5.0
Maximum sensitivity (for 50 mW) +
118.0 MHz microV 0.5 3.0
127.0 MHz microV 0.5 3.0
135.0 MHz microV 0.5 3.0
Threshold squelch (MANUAL)
VHF low band at 40.0 MHz microV 0.3 1.0
VHF high band at 155.0 MHz microV 0.4 1.2
UHF band at 460.0 MHz microV 0.4 1.8
Aircraft at 127.0 MHz microV 0.4 2.0
Public service band at 860.0 MHz microV 0.4 3.0
Tight squelch (MANUAL) (S+N)/N
VHF low band at 40.0 MHz dB 25 20
VHF high band at 155.0 MHz dB 25 20
UHF band at 460.0 MHz dB 25 20
Aircraft at 127.0 MHz dB 17 10
Public service at 860.0 MHz dB 25 20

band: Hum and noise
VHF low band at 40.0 MHz dB 50 35
VHF high band at 155.0 MHz dB 45 30
UHF band at 460.0 MHz dB 35 25
Aircraft at 127.0 MHz dB 50 35
Public service band at 860.0 MHz dB 32 25
Audio frequency response -6dB
(at 155.0 MHz) Low Hz 220 150-350
High Hz 2200 1500-3500
(at 127.0 MHz) Low Hz 220 150-350
High Hz 2200 1500-3500
Audio output power
(at 155.0 MHz)
Maximum Output Power mW 250 100
10% THD Output Power mW 220 90
(at 127.0.MHz)
Maximum Output Power mW 290 100
10% THD Output Power mW 220 90
Distortion
at 155.0 MHz 100 microV input % 1.5 6
at 127.0 MHz 100 microV input % 2.0 10
Modulation acceptance at EIA RS-204-A
kHz +/-12 +/-5
Selectivity (at 155.0 MHz)
-6 dB kHz +/-11 +/-15
-50 dB kHz +/-15 +/-20
If rejection at (155.0 MHz) dB 70 50
Residual noise (at SQ open) mV 0.5 5
Scan rate CH/sec. 50 -
Scan delay sec. 2 1-3
Current drain
(at full output) mA DC 130 100-200
(at Squelched) mA DC 55 70
(at Keep alive) mA DC 0.2 1.0
Memory backup time day more than 4 3
Low batt. turn on voltage V 4.5 4.7-4.29
Auto power off voltage V 4.3 4.49 -4.10
Note: Nominal specs represent the design specs. All units should be able
to approximate these - some will exceed and some may drop slightly
below these specs. Limit specs represent the absolute worst
condition that still might be considered acceptable; in no case
should a unit fail to meet limit specs.

product
200-0308 PRO-51 200-Channel Scanner
Question: What charger does this require?
Answer:
This requires a 9V, 300 mA (minimum) adapter with a 1.3 mm / 3.4 mm plug. The
273-1863 DC/DC adapter and the 273-1767 AC/DC adapter
both meet these requirements. Each comes with your choice of one free
adaptaplug.
You will need the "H" size adaptaplug, Cat. No. 273-171"

Radio Communications FAQ Index
Question: Is this a trunking scanner?
Answer: No.
Radio Communications FAQ Index

PRO-51 200-Channel Programmable Scanner
(200-0308) Operation Faxback Doc. # 31135

Resetting the Scanner
1. Turn off the scanner.
2. While you press and hold down the 2 and 9 keys, turn on the scanner.

Programming Channels
1. Press MANUAL. Enter the channel number you want to program.
2. Press PROG. PGL appears on the display to indicate the scanner is in
the programming mode.
3. Enter a frequency.
4. Press ENTER to store the frequency.
5. Repeat Steps 1-4 to program more channels.

Limited Search Operation
1. Press MANUAL.
2. Press PROGRAM.
3. Press LIMIT. LO appears on the display.
4. Enter lower Frequency limit desired.
5. Press ENTER.
6. Press LIMIT. HI appears on the display.
7. Enter desired high frequency to search.
8. Press ENTER.
9. Press up-arrow or down-arrow to start searching up or down the frequency
scale.

pro-51 scanner keyboard chart

1st row
scan, band, 1(AIR 1-20), 2(FIRE 21-40), 3(MARINE 41-60)

2nd row
manual, prog, 4(wx61-80), 5(81-100), 6(101-120)

3rd row
pri, moni, 7(121-140), 8(141-160), 9(161-180)

4th row
l/out, clear, .(delay), 0(181-200), e(ENTER)

5th row
k/l, light, (down-arrow), (LIMIT), (up-arrow)

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