21_2125_MHz_with_VFO

Published:2009/7/14 3:50:00 Author:May | From:SeekIC

Developed for low-power CW work in 15-meter amateur band. Colpitts oscillator Q1 runs continuously at 10.5-10.625 MHz during transmit and receive, for good frequency stability, so VF0 frequency must be shifted away from operating frequency during receive periods. Supply is 12 V at 1.3 A. C6 is 4-53.5 pF. RFC4 is 16turns No. 28 enamel, RFC5 is 11 turns No. 22, and RFC6 is 6 turns No. 22, each on Amidon FT-50-61 core. Article covers construction and tune-up.-J. Rusgrove, A 15-Meter Goober Whistle, QST, Jan. 1976, p 16-19.



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