Modern Era SSB Sets
DH4PY

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  PRM4031
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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.
     
       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