35_4_MHz_TUNABLE_IF_WITH_NOISE_BLANKING

Published:2009/7/7 23:47:00 Author:May | From:SeekIC

MC1550G is followed by Silicon General 563402T mixer that provides good conversion gain with very light oscillator loading. Mixer output is fed to 40673 amplifier that builds up noise spikes for blanker consisting of 1N60 diode gate and 40673 pulse amplifier. Blanker is fed from envelope detector that controls gate feeding FL1 dual ceramic filter providing IF selectivity. IF stage following blanker uses SD304 dual-gate MOSFET, transformer-coupled to ceramic filter FL2 at IF output. Article gives construction details.-R. Megirian, The Minicom Receiver, 73 Magazine, April 1977, p 136-149.



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