TR_SWITCH

Published:2009/7/13 22:28:00 Author:May | From:SeekIC

Consists of driver transistors Q1 and Q2 and reed relays K1-K3. K1 switches antenna from receiver to transmitter, K2 grounds receiver input, and K3 keys transmitter. Coil of K1 has 400 turns No. 32 enamel, while K2 and K3 each have 120 tums. Coils are wound directly on glass of reed relays and covered with epoxy cement. LED normally glows dimly, with brightness increasing when character is keyed.-J. H. Fox, An Integrated Keyer/TR Switch, QST, Jan. 1975, p 15-20.



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