80_METER_VFO

Published:2009/7/14 3:42:00 Author:May | From:SeekIC

Used in place of crystal-con- trolled oscillator in low-power (QRP) amateur -transmitter. Tuning range is 1750-1875 kHz in 160-meter band. Colpitts oscillator uses JFET Q5 with series-tuned tank for good stability. Q6 provides isolation between oscillator and push-push class C doubler amplifier stage. Doubling gives desired 80-meter output.-D. DeMaw and J. Rusgrove, Learning to Work with Semicon-ductors, QST, Oct. 1975, p 38-42.



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