Sunday, August 24, 2014

Browse » home» » » » » » VHF Preamplifier 15 20 dB

VHF Preamplifier 15 20 dB


The actual preamplifier in this schema 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 schema 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.

No comments:

Post a Comment