AF_FOR_AM_SSB_CW

Published:2009/7/16 6:07:00 Author:Jessie | From:SeekIC

Uses SG3402T as detector, with BFO disabled for AM. Pin 3 of detector output is main audio source, feeding preamp using half of dual opamp whose output goes to AF gain control except when CW filter is in use. Filter has two identical 400-1600 Hz active bandpass sections joined by threshold detector.LM38ON-8 AF power amplifier is rated at 600mW output. Audio from pin 8 of detector is amplified about 30 times in second half of dual opamp before rectification for use as AGC voltage. Circuit includes S-meter fed by AGO section. Article gives construction details of complete receiver.-R. Megifian, The Minicom Receiver, 73 Magazine, April 1977, p 136-149.



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