US Radio and Communications Equipment in Vietnam

US RADIO EQUIPMENT - Page Title


FM voice radios of the AN/VRC-12 series, provided the primary means of communication for armor units in RVN. Radio sets AN/VRC-12, -46, -47 and -49 (below), provided short range, two-way frequency modulated (FM), radiotelephone communication between vehicles or crew-served weapons. The set configurations consist of different component groupings of the Receiver-Transmitter RT-246/VRC, RT-524/VRC, Receiver R-442/VRC, and associated interphone equipment.

AN/VRC-12
1 x Rt-246/VRC and 1 x R-442/VRC
AN/VRC-46
1 x RT-524/VRC

AN/VRC-47
1 x RT-524/VRC and 1 x R-442/VRC

AN/VRC-49
2 x RT-524/VRC

RT-246/VRC and RT-524/VRC

These FM receiver-transmitters have essentially the same operational capabilities, the exceptions being that the RT-246 has a 10 preset channel capability and the RT-524 has no presets, but does have a built-in speaker.

Characteristics and Capabilities

  • Frequency range; 30.00 - 75.95 MHz
  • Type of service; Voice
  • Preset frequencies; 10 (RT-246 only)
  • Transmission planning range; 20-miles stationary, 15-miles moving
  • Type of operation; push-to-talk
  • Type of control; local or remote
  • Antenna; center fed whip
  • Number of channels; 920
  • Type of squelch; noise or tone
  • Power requirements;
    • Vehicular; 24-volt DC vehicular power
    • Fixed; requires 115/230-volt AC for Power Supply PP-2953/U

Receiver - Transmitter, Radio RT-246/VRC
Receiver - Transmitter, Radio RT-246/VRC

 

Receiver - Transmitter, Radio RT-524/VRC
Receiver - Transmitter, Radio RT-524/VRC


R-442/VRC

The FM radio receiver R-442/VRC is used in conjunction with the Receiver-transmitter RT-246 and RT-524, giving the operator a facility for monitoring an additional frequency.

Characteristics and Capablities

  • Frequency range; 30.00 - 75.95 MHz
  • Type of service; Voice
  • Preset frequencies; none
  • Antenna; multisection whip
  • Type of squelch; noise or tone
  • Power requirements; Vehicular; 24-volt DC vehicular power

Receiver, Radio R-442/VRC
Receiver, Radio R-442/VRC


Radio Sets AN/PRC-25, AN/VRC-53 and AN/GRC-125

Configurations of these radio sets provide both portable and vehicular, two-way, FM, radio-telephone communication. The AN/PRC-25 is the portable, man-packed radio set; the AN/VRC-53 provides vehicular operation and the AN/GRC-125 is capable of both man-packed portable or vehicular operation.

Radio Set AN/PRC-25
Radio Set AN/PRC-25

Radio Set AN/VRC-53
Radio Set AN/VRC-53

Radio Set AN/GRC-125
Radio Set AN/GRC-125


Receiver-Transmitter, Radio RT-505/PRC

This is the basic component of Radio Sets AN/PRC-25, AN/VRC-53 and AN/GRC-125

Characteristics and Capabilities 

  • Frequency range; 30.00 - 75.95 MHz

  • Type of service; Voice

  • Presets; Two

  • Range; 5 miles

  • Type of operation; push-to-talk

  • Type of control; local or remote (using AN/GRA-39)

  • Types of antennas;

AN/PRC-25;

  • Short antenna - 3-foot semi-rigid steel tape

  • Long antenna - 10-foot multisection whip

AN/VRC-53 and AN/GRC-125 vehicular mounted. AT-912 (10-foot vehicular whip with antenna matching unit MX-2788/VRC or MX-6707/VRC).

  • Number of channels; 920

  • Type of squelch; tone operated

  • Power requirements

  • Battery, BA-386

  • Vehicular, 24-Volt DC

 Receiver - Transmitter, Radio RT-505/PRC
Receiver - Transmitter, Radio RT-505/PRC


Amplifier Power Supply Group OA-3633/GRC

The set consists of an amplifier power supply and a special purpose cable assembly. This equipment provides voltages for the operation of receiver-transmitter and the antenna matching unit for vehicular installation. In addition, it amplifies the received radio signals from the receiver-transmitter.

Amplifier Power Supply Group OA-3633/GRC
Amplifier Power Supply Group OA-3633/GRC


Radio Set Control Group 

The AN/GRA-39 provides remote radio operation for distances up to 2 wire miles as well as telephone signaling and communication between the remote and local radio operators. The set consists of a local unit (used with a radio), a remote unit, handset and carrying bag.

Radio Set Control Group AN/GRA-39
Radio Set Control Group AN/GRA-39


See also US Radio Communications and Delta Mike 2 - Radio Communications


SOURCE

US Army Armor School, Fort Knox, Kentucky, Special Text 17-1-3 'Armor in Vietnam'


 

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