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144 MHz preamplifier with BF981


Hits 144 MHz preamplifier with BF981

This article includes information on improving the sensitivity and noise temperature of receiving systems, thus improving the quality of weak VHF and UHF RF signals

144 MHz preamplifier with BF981

Preamplifiers Links

Preamp using ATF54143, PA3CSG
The design uses source feedback and has a diplexer on the output. The diplexer takes care of the output of the fet and assures that it is always correctly loaded

160 Meter preamplifier, KD9SV
KD9SV Products have been helping enthusiasts get the most from their Low Band receiving antenna systems for over 25 years

A preamplifier for HF with 2N5109, W7IUV
Based on a design in Solid State Design For the Radio Amateur, 1977 ARRL - Pages 97, 98, 122, 123. Uses a single bipolar NPN transistor

A 21-30 MHz low noise amplifier, OZ2OE
Design of a preamplifier for the "deaf" HF receiver. When you need extra sensitivity for 15, 12 and 10 meter operation - for example for amateur satellites

I decided to build a smaller preamplifier for UHF 430-440Mhz and to add a sharp filter at its output, most likely an interdigital filter