5_MHz_±_250_kHz

Published:2009/7/2 9:03:00 Author:May | From:SeekIC

Simple and stable circuit using PNP transistors has tuning range of about 250 kHz in any segment of 5-9 MHz range, depending on how oscillator coil is set. Wind coil on ceramic form or use air-wound coil. Capacitors marked M should be mica for stability. Tuning capacitor is 365 pF,from AM radio, 400/N750 temperature-compensating capacitor can be replaced by 400-pF mica unless VFO is used in mobile application.-An Accessory VFO-the Easy Way, 73 Magazine, Aug. 1975, p 103 and 106-108.



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