AM_HOMODYNE

Published:2009/7/16 0:07:00 Author:Jessie | From:SeekIC

Circuit uses ICs to provide product demodulator that overcomes interstation tuning whistles or heterodynes by deriving local oscillator source from incoming signal carrier. This AM carrier is amplified before modulation is stripped off, and used in homodyne system in which convener output (IF signal) is the same as audio signal. Motorola MC1330P IC, originally developed as color TV video detector, is here connected as synchronous demodulator. RF amplifier IC is RCA CA3028A operating in cascode mode, with permeability tuning of input and RF choke and input of MC1330P together forming output load. Article covers circuit operation in detail and gives alignment procedures. Although developed for broadcast band, basic circuit can be adapted for communication and FM receivers as well.-J. W. Herbert, A Homodyne Receiver, Wireless World, Sept. 1973, p 416-419.



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