[amsat-bb] Re: Mast-mounted preamp recommendation?
Hector Luis Martinez Sis
hmartinez at ucf.edu.cu
Fri Nov 4 06:28:09 PDT 2011
I built this preamplifier as Domenico described in his article. I am using it with a
great success too. My environment area is very hot also; I live into the city wish has a
lot of buildings, Ham activity, broadcastings, repeaters and other stations.
Before I used it; I had the T/V channel interference on the downlink of SO-50 and AO-27.
When I began to use the preamplifier the interference disappeared.
It is a great design!
> Hi Jamie
> 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"
> Have fun.
> 73" de
> i8CVS Domenico
> ----- 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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> Sent via AMSAT-BB at amsat.org. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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