[amsat-bb] Re: Mast-mounted preamp recommendation?
domenico.i8cvs at tin.it
Thu Nov 3 20:15:04 PDT 2011
In a separate email I have sent to you an article that I write for Radio
Rivista 9/1993 describing with schematic diagrams and mechanical
drawings my low noise GaAsFET high dinamic range and high
selectivity cavity preamplifier for 435 MHz with NF=0,43 dB and
gain G = 20 dB
I am using it with great success in my environment area in the bay of
Naples wich is "hot" with a lot of ham activity, local pagers and FAA
By the way it require a lot of mechanical work but for best performance
it must be tuned for the lowest Noise Figure using only a very simple
diode noise generator that was described in the article.
Unfortunately building low noise preamplifiers and tuning instruments
by yourself in novadays seems to become a RF "endangered species"
----- Original Message -----
From: "James Cutler" <jwcutler at gmail.com>
To: <amsat-bb at amsat.org>
Sent: Friday, November 04, 2011 2:18 AM
Subject: [amsat-bb] Mast-mounted preamp recommendation?
> Does anyone have any recommendations on high quality mast-mounted preamps
> for UHF? We're using the Icom AG-35 and not happy with the noise figure.
> We're going to try an adjustment described here
> We are looking at the amps from ARR and SSB. Any other recommendations?
> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
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