UNTUNED_DOUBLE_BALANCED_MIXER

Published:2009/7/21 23:10:00 Author:Jessie | From:SeekIC

Wideband mixer for high-frequency SSB circuits operates from single 12-V supply. Gain is controlled by R9 and increases as value of R9 is decreased. Output at pins 13 and 14 is product of local oscillator and signal input frequencies and contains desired IF value for receiver. Oscillator signal level should be kept below 20 mV to avoid undesired harmonics produced by limiting. Circuit uses Mullard TCA240 dual balanced modulator-demodulator.- Applications of the TCA240, Mullard, London, 1975, Technical Note 18, TP1489.



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