[amsat-bb] Re: Mast-mounted preamp recommendation?

[Hector Luis Martinez Sis]

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" <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?
>
>
>> 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 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!
>> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
> _______________________________________________
> 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!
> 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/