survived for just over five years after Clansman was introduced. Once the PRC/RT320 was completed and fully fielded, the PRC 316 was rapidly withdrawn. Another reason cited for its retention was that it was relatively easy to operate and was inter-operable with the other HF Radios in the Clansman family. UK/PRC 319 Special Forces and STA Patrol man-portable, patrol level radio HF / VHF, half-duplex transceiver capable of burst transmission which was built in the United Kingdom by MEL. Features include key-pad entry of frequency, mode and data with digital LCD display; 10 pairs of pre-programmable channels; half-duplex operation with the option of transmitting and receiving on different channels; the option of using the removable pocket-sized BA-1304 electronic message unit (EMU) to transmit and receive short data communications; fully automatic antenna tuner which can be remoted up to 50m from the set using standard co-ax cable; self-test facility. power output of 50 watts PEP on high power setting with an adjustable low power of 2–5 watts. Frequency range 1.5–40 MHz with upper sideband, data, or CW modulation. UK/PRC 320 An HF/USB/AM/CW transceiver built by Plessey and issued down to company level. The set operates in the 2–29.9999 MHz range with a possible 280,000 channels. RF power output is a selectable 3 or 30 watts. Derived from an earlier prototype known as the B20, the PRC 320 can be used as a manpack (backpack) or vehicular radio and replaced the Larkspur Station Radio (SR) A13 SR C13 and other HF radios in service with the British Army. The PRC320 can be used with a number of different Clansman antennas that are supplied with the set; a 2.4m whip antenna is supplied for portable manpack operation using HF groundwave communication with a range of up to . Alternatively a dipole antenna can be used for HF skywave operation with a range of up to . The set includes a built-in Antenna Tuning Unit (ATU) which electrically matches the whip antenna length to the radio frequency in use. The ATU can also match any other wire antenna to the operating frequency. The set together with its ancillaries (batteries, cables, audio gear and antenna parts) together make up the complete equipment schedule (CES). The use of morse code and later data transmission and reception could extend the range and add to the versatility of the UK/PRC 320. A number of data entry devices were