Hi Jaime
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!
73! Hector, CO6CBF
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 stations.
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" [email protected] To: [email protected] Sent: Friday, November 04, 2011 2:18 AM Subject: [amsat-bb] Mast-mounted preamp recommendation?
All,
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 http://www.eham.net/reviews/detail/6116.
We are looking at the amps from ARR and SSB. Any other recommendations?
http://www.ssbusa.com/gaasfet.html http://www.advancedreceiver.com/page10.html
Thanks,
--Jamie _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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