60 TO 72MHz VIDEO AND SOUND RECEIVER AND IF SYSTEM


Posted on Feb 5, 2014

This IF system uses a NE602 oscillator/mixer to convert VHF TV signals of 60 to 72 MHz (channe13 or channel4 under the U.S. NTSC) to 45 MHz. An SAW filter is used to provide bandpass filtering, followed by an LM1823 video IF/AGC/AFC/detector IC. Recovered video is fed to a sound trap and 4.5-MHz sound takeoff filter. Video is fed to the output emitter follow..


60 TO 72MHz VIDEO AND SOUND RECEIVER AND IF SYSTEM
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