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PRM-4720
Tactical handheld radio - this page is a stub

PRM-4720A is a tactical portable military FM radio for the VHF-L band (30-88 MHz), developed in the late 1980s by Racal Tacticom Ltd. 1 in Reading (UK). The device was intended for tactical (non-secure) use by the Army and was housed in a rugged green die-cast metal enclosure.

The radio is housed in a die-cast aluminium enclosure that has the same form factor as the PRM-4515. It is powered by a removable battery that is attached at the bottom. It can be pre-programmed with up to 10 channels in the 30-88 MHz range, with a channel spacing of 25 kHz.

The unit delivers an output of 1 Watt into either a whip antenna or a suitable helical. Note that multiple helical antennas are needed to cover the entire frequency range. It is shown here with antennas for 50 and 75 MHz. At the side is a socket for connection of a handset or a headset.
  
PRM-4720 with battery and antennas

The 10 channels can be programmed manually (on the device) or by means of the external MA-4083B fill gun. A variant with built-in microphone/speaker was available as the PRM-4072B. Furthermore, a sececure variant (with built-in crypto facilities) was available as the PRM-4515.

  1. Racal was taken over by Thales in 2000.

Complete PRM-4720 kit
PRM-4720 with battery and antennas
PRM-4720 with detached battery
Bare PRM-4720 unit
Controls at the top
Frequency display
PRM-4720 in carrying case, with antennas, microphone and speaker
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Complete PRM-4720 kit
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PRM-4720 with battery and antennas
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PRM-4720 with detached battery
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Bare PRM-4720 unit
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Controls at the top
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Frequency display
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PRM-4720 in carrying case, with antennas, microphone and speaker

Specifications
  • Device
    Handheld military VHF-L band transceiver
  • Model
    PRM-4720A
  • Manufacturer
    Racal
  • Country
    UK
  • Customers
    UK, Belize, Denmark, Cyprus, Greece, Kuweit
  • Frequency
    30 - 88 MHz
  • Readout
    LCD display (at the side)
  • Spacing
    25 kHz
  • Channels
    10
  • Stability
    +-10 ppm
  • Output
    1 Watt
  • Modulation
    Narrowband FM (F3E) simplex, F1E 16 kbps data
  • Pilot tone
    148.8 Hz
  • Response
    400 Hz - 2.5 kHz ±3dB (narrowband voice)
    30 Hz - 10 kHz (wideband data)
  • Power
    10V DC
  • Consumption
    430 mA (typical)
  • Battery
    MA-4721A rechargeable battery pack
    MA-4516B primary battery pack
    MA-4516G for 8 removable penlight cells
  • Antenna
    Whip
    Helicals (various types)
  • Temperature
    -20°C to +55°C (storage: -40°C to +85°C)
  • Dimensions
    225 x 75 x 26 mm
  • Weight
    600 g
Optional accessories
  • Canvas pouch
  • Whip antenna
  • Helical antenna (50 MHz)
  • Helical antenna (75 MHz)
  • Handset
  • Headset with boom microphone
  • Battery (various types)
Documentation
  1. PRM 4720A VHF Transmitter/Receiver Operating Instructions
    Racal Tacticom Ltd. May 1986.
References
  1. D.J. McKay (G1JWG), Racal PRM4720
    Radio History UK, Retrieved May 219.
Further information
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Crypto Museum. Created: Saturday 18 May 2019. Last changed: Monday, 07 November 2022 - 19:44 CET.
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