FET_DPDT

Published:2009/7/14 1:05:00 Author:May | From:SeekIC

Uses FETs as switching elements for transferring VFO and carrier oscillator signals between first and second mixers of SSB transceiver. Transmitter key line is at +13 V on receive and 0 V on transmit, and T line has opposite voltages. On receive, Q304 and Q305 are pinched off by about +10 V, while Q303 and Q306 are conducting with only about +0.7 V on their gates. VFO signal then flows to first mixer and carrier oscillator to second mixer. On transmit, conditions are opposite.-J. Schultz, CQ Re-views: The Atlas 210 and 215 SSB Transceivers, CQ, May 1975, p 22-27 and 65.



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