Posted on Feb 7, 2014

Simple, easily transported VSWR meter consists of high-gain amplifier, narrow-bandwidth (100-Hz) selective amplifier tuned to 1000 Hz, and variable-gain output amplifier driving low-cost VU meter. Ideal for nulling type VSWR measurements. Draws only about 6mA from 9. V transistor battery. Closing S1 increases gain about 100 times for Iow. Ievel read

Click here to download the full size of the above Circuit.

ings. R1 sets U1B to 1000 Hz, while R2 sets reference on VU meter. -J. Reisert Matching Techniques for VHF/UHF Antennas, Ham Fladio, July 1976, p50-56.

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