FREE CIRCUIT DIAGRAMS 4U: VHF Preamplifier 15-20 dB

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Thursday, September 10, 2009

VHF Preamplifier 15-20 dB

The actual preamplifier in this circuit is a practical wideband amplfier that gives about 15 - 20dB of gain from 1.8 MHz through to well over 200 MHz. You will no-doubt replace this circuit for your own favorite amplifier for the band you are interested in.

http://www.elecfree.com/electronic/wp-content/uploads/2009/08/vhf-preamplifier-15-20-db.gif

The 2.2mH chokes should have an absolute minimum reactance of 5000 ohms at the lowest frequency to be used. For 145 MHz these may simply consist of a few turns of wire. I personally used a 10-turn 4mm Dia. coil in series with a 2.2mH torroidal inductor.