DIODE_SWITCHED_CRYSTALS

Published:2009/7/3 4:11:00 Author:May | From:SeekIC

1N458 diodes switch crystals in pairs to provide two different degrees of selectivity for 455-kHz IF filter, For 500-Hz bandwidth in amateur communication receiver, spacing between crystal frequencies should be 300 Hz, which is obtained with 455.150 kHz for Y1A and 454.850 kHz for Y1B.Provides adequate CW selectivity for transceiver having good SSB filter.-J. J. Schultz, Economical Diode-Switched Crystal Filters, CQ, July 1978, p 33-35 and 91.



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