REMOTE_TUNING

Published:2009/7/13 23:32:00 Author:May | From:SeekIC

Simple sweep generator and 5-5.5 MHz VCO provide remote manual or automatic electronic tuning of 6-meter transceiver, for quick check of possible band openings a few kilohertz from frequency to which receiver is normally tuned. To adjust, set S1 on MANUAL and turn R2 fully counterclockwise. If signal at lowest received frequency is applied to antenna jack, signal can be centered within IF passband of receiver by adjusting C1. Next, turn R2 fully clockwise, apply signal at highest frequency to be received, and center signal within passband again by adjusting C2. With S1 in AUTO position, R1 determines highest frequency tuned. If sweep rate is too low, reduce value of C3. Point A is used to drive CRO through FET buffer stage, for displaying signals present within sweep range as pips on screen.-J. R. Bingham, Sweep 6 Meters and Really Clean Up! QST, April 1977, p 27-28.



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