160_METER_VFO

Published:2009/7/6 0:52:00 Author:May | From:SeekIC

Standard Colpitts oscillator Q1 with emitter-follower Q2 gives dependability and adequate isolation from later stages Zener regulation provides stability even with weak battery Output is about 0.7 VRMS. Low-level parasitic oscillation may occur about 150 kHz below operating frequency but is suppressed by tuned stages following VFO. L1 is 52 turns No. 28 enamel on Amidon T-50-2 toroid. RFC1 is 850μH.-A Weiss, Design Notes on a Moderate Power Solid State Transmitter for 1.8 MHz, CQ, Nov. 1972, p 18-22, 24, 98, 100, and 102.



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