The Clansman PRC-351 Back-Pack Radio is a 4 Watt portable VHF (FM) Radio, made by RACAL Ltd. in England. The PRC-351 has been designed to provide command communications at battalion and company level for dismounted troops. It was also used in vehicles by mounted troops. The PRC-351 replaced the older A41 and A42 British VHF radios.

Frequency Range 30 to 76.000 MHz in 25 Khz steps giving a total of 1841 programmable channels. The desired frequency is set by four knobs on the side of the radio which can be operated even while the operator is wearing Arctic mittens, or in the dark by counting clicks from the end-stops.

A Whisper mode is provided for use when quiet conditions are essential. In this mode the receiver's audio output volume is reduced and the microphone sensitivity is increased. A Loud mode is also provided for operation in noisy environments as well as a Noise-On switch position which allows the radio to operate with the squelch in the off mode.

Output power of the radio is 4 Watts into a 50 Ohm load and the transmitting range is up to 10 Km when used with 1.2 meter standard whip antenna in open country side, and up to 20 Km when used with a vehicle antenna. The radio can be capable of transmitting to much greater distances by adding an external clip on 20 Watt RF amplifier. In this configuration the radio would effectively become a Clansman PRC-352.

If more than one radio set is used in close proximately a Selective Unit RF 4 Watt "SURF" should be installed on top of the PRC-351 radio. The SURF prevents one radio interfering with the other radio. The SURF is then tuned to give optimum performance and achieve maximum range with the radio set.

The radio is powered by a standard Clansman 24 Volt battery pack. The battery clips on to the bottom of the radio. The radio can also be powered / recharged with a Hand Generator which clips on between the radio and the battery. It can also be powered externally from Vehicle power supply or a 24 Volt DC Power Supply connected to the radio with a modified battery extension lead.