20_dB_PREAMP_FOR_160_METERS

Published:2009/7/16 3:30:00 Author:Jessie | From:SeekIC

Provides badly needed extra gain when using Beverage or other inefficient low-noise receiving antennas. Gate of common-source JFET is tapped down on tuned circuit by capacitive divider C3-C4 to prevent self-oscillation. Mica compression trimmer C1 provides match to antenna. L1 and L2 are J. W. Miller 43-series slug-tuned coils; L1 has tuning range of 36-57 μH, and L2 has 24-40 μH range. For 160-meter band, L1 and L2 can be peaked at 1827 kHz to provide maximum gain in 1825-1830 kHz DX window.-D. DeMaw, Build This Quickie Preamp, QST, April 1977, p 43-44.



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