CW_SIDETONE

Published:2009/7/11 5:05:00 Author:May | From:SeekIC

Audio sidetone oscillator serves for monitoring CW keying. Changes in transmitter operating frequency do not affect sidetone circuit. Hartley AF oscillator Q2 is turned on by diode rectifier and DC amplifier Q1.Antenna coupling shown is adequate from 160 through 10 meters. For VHF use on 6 and 2 meters, small tuned circuit and pickup antenna are usually required to get enough RF input for monitor. Audio pitch is adjusted by changing value of C1.-J. Fisk, Circuits and Techniques, Ham Radio, June 1976, p 48-52.



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