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PRM4031
was built by RACAL in the early 80s. I could not find
out where it was used. It is a very compact HF- SSB- transceiver.
This special radio, however, was taken from an Iraq soldier during the last conflict there.
It uses very ample accessories :
Various hand- or headsets,
A loudspeaker- amplifier, powered from the radio,
CW key,
Remote control (up to 3 km via a 2-wire cable),
Various rod- and wire- antennas,
Mast- kit, 5.4 m,
Interface-box for vehicles,
Hand- crank generator,
Power supply,
100- Watt- amplifier,
and many more items.
Operational elements on the front are:
5 frequency control knobs,
Meter for (manual) antenna tuning and battery power,
2 audio connectors,
ON / off switch (also low / high output),
Mode switch,
Loudness knob,
Antenna tuning knob,
3 antenna connectors: rod antenna, BNC- connector for
1.6 .. 8 MHz, BNC- connector for 8 .. 30 MHz.
No data could be found about the voice scrambler MA 4224, belonging to PRM4031.
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MA 4224
( <== click ) |
- Frequency range:
- 1.6 .. 29.9999 MHz
Technical data:
- Channels:
- 284.000
- Channel spacing:
- 100 Hz
- HF output:
- High: 10 W (SSB and CW)
- Low: 6 dB reduction
- Sensitivity:
- SSB: 1 µV @ 15 dB
- CW : 1 µV @ 22 dB
- AM : 3 µV @ 10 dB ; 30 % modulation
- Modes:
- USB (A3J)
- USB CW (A2J), CW- tone 1 hKz
- LSB CW
- LSB (A3J)
- AM- compatible (A3H)
- Anntennas:
- Rod antenna 2.4 m (8 ft)
- Long wire
- Dipole
- Optional: short helical battle antenna
- Power consumption, transmitting:
- SSB: 1,8 A
- CW: 3 A
- Power consumption, receiving:
- Max: 170 mA
- Typical: 150 mA
- Powered by:
- 12 V / 4 Ah -NiCad type MA.4025A
- 15V- battery box for 10 A- cells
- Hand generator MA.4175A
- Power supply MA.4107
- Weight:
- With handset, NiCad- battery and harness: 8 kg
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RU-20
PRC-320)