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April 7 Program: Collins KWM-1 Restoration Project Print E-mail
Written by Dietolf Ramm   
Sunday, 29 March 2015 22:15

John Green, KX4P, will give a presentation including slides and video illustrating his work in restoring a Collins KWM-1 transceiver.

He writes this about the rig:

The KWM-1 was a historic milestone in HF radio communications ushering in the first commercially successful transceiver. Prior to its development, ham communications used separate receiver and transmitter equipment. By the mid 1950s, most stations were true "boat anchors" using 120 pound AM transmitters and 65 pound receivers, all connected together with relays, cables, wires, etc. The Collins "Gold Dust Twins" (KWS-1 and 75A4) were top of the line examples.

In 1956 Collins produced the KWM-1. It was the first commercially successful transceiver, replaced AM with SSB and offered a complete 100 watt mobile/desk-top station in a small 16 pound cabinet. Only a few were made because, being immediately popular, it was redesigned and produced for both the amateur and military market as the famous KWM-2 (1958-1978 ?). It was later redesigned as the all solid state KWM-380 (1979-1983). Collins then exited the ham radio market.