14_MHz_VFO_USING_DOUBLER

Published:2009/7/13 21:50:00 Author:May | From:SeekIC

Developed for use with 20-meter low-power (QRP) transceiver. Push-push doubler avoids instability problems of 14-MHz oscillator and minimizes chirp during CW transmit periods. Uses lowdrift series-tuned Colpitts oscillator operating at 7 MHz, with source-follower buffer separating it from doubler. Adjust dynamic balance -control R1 of doubler for best output waveform purity. Capacitors marked P are polystyrene, and SM are silver mica, Article stresses importance of choosing and using components that minimize drift.-D. DeMaw, VFO Design Techniques for Improved Stability, Ham Radio, June 1976, p 10-17.



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