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

Stan, W1LE stanw1le at verizon.net
Thu Nov 3 18:48:15 PDT 2011

The difficulty with mast mounted preamplifiers is that they have to be 
selected for a
specific electromagnetic environment.
If your environment is "hot" with a lot of ham activity, local pagers 
and FAA stations,
the preamp may not be able to handle all of the RF, unless it is 
suitably narrow banded.

Some preamplifiers are broadband and some are narrow band, where you 
will be operating.
If your environment is quiet, most any preamplifer will work well.
If your RF environment is NOT quiet, you have to limit the preamp RF 
pass band for your activity.
Otherwise too much RF gets into it and raises the noise floor, reducing 
the S/N

Last time I tested a ICOM 2M preamp, it performed well, less than 1 dB 
NF with pro test gear.

What does your RF environment look like ?

Stan, W1LE    FN41sr     Cape Cod

On 11/3/2011 9:18 PM, James Cutler wrote:
> 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
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