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DIODE_SWITCHED_FOUR_CRYSTAL_IF_FILTER

2017-02-21 21:19  
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DIODE_SWITCHED_FOUR_CRYSTAL_IF_FILTER
Appiication of 9-12 VDC to control points A or B gives choice of two different selectivities for IF amplifier in amateur communication receiver.For 500-Hz bandwidth at 455 kHz, frequencies of crystals in use should be 300 Hz apart for CW, 1.8 kHz apart for 2.7-kHz SSB bandwidth, and 1.25 kHz apart for 2.1-kHz SSB bandwidth. Article gives design graphs.-J. J. Schultz, Economical Diode-Switched Crystal Filters, CQ, July 1978, p 33-35 and 91.