UP_DOWN

Published:2009/7/16 3:47:00 Author:Jessie | From:SeekIC

Circuit shown was developed for use in 5645.8-kHz IF amplifier of Drake R-4B amateur-band receiver, to utilize high-performance characteristics of Sherwood Engineering CF-125/8 CW crystal filter having bandwidth of only 125 Hz. Texas Instruments TL442 double-balanced mixers convert IF signal to 5695-kHz center frequency of filter and convert filter output back to IF value. Same crystal oscillator serves for both upconversion and downconversion. Gives true single-signal reception. Article covets procedures for interfacing any crystal filter with any receiver IF value. -H. Sartori, An Up/Down Filter Converter, Ham Radio, Dee. 1977, p 20-25.



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