2945_MHz_PREAMP

Published:2009/7/16 1:52:00 Author:Jessie | From:SeekIC

Reduces noise figure of average communication receiver 2.5 dB and adds up to 20 dB of gain, as required for reception of 29.45-MHz satellite beacon signals. Q1 is RCA 40673 or almost any other dual-gate MOS-FET, with shield partition across the device. L2 is 10 turns No. 24E spaced on 1/4-inch slug-tuned core, with 2 turns over cold end for L1. L3 is 10 turns No. 24E closewound on 1/4-inch slug-tuned core, with 2 turns over cold end for L4.-J. D. Colson, An Oscar Preamp That Works Wonders, 73 Magazine, July 1975, p 31-32.



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