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 > *************************************** Genius is one per cent inspiration, and ninety-nine per cent perspiration. -- Thomas A. Edison *************************************** --- Free the Cuban Five! http://www.injusticia.cubaweb.cu/, http://www.antiterroristas.cu/ Participe en Universidad 2012, del 13 al 17 de febrero de 2012. Habana, Cuba. http://www.congresouniversidad.cu/ Consulte la Enciclopedia Colaborativa Cubana: http://www.ecured.cu/ _______________________________________________ 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
