The Clansman 25 Watt HF Selector Unit SURF for use with the Clansman VRC-321 HF vehicle transceiver. It can also be used with other HF radio transmitters with output powers of up to 25 Watts.
The SURF is used when more than one radio is used in close proximately and 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.
NSN: 5820-99-620-8079. Supplied in good condition.