[amsat-bb] Re: Preamp location tech question

Jean-François Ménard jf.va2ss at gmail.com
Fri Dec 18 11:43:24 PST 2009

Hi, it is more efficient to keep preamps to the nearest place of
antenna..... at this moment you are also amplify noise that is pick up
by your coax. I tested the difference before changing my feed line
with heliax ldf4, and you can hear a difference on low elevevation
pass. I really think it worth it, even if you have only 50 feet run. I
have alsmost the same lenght of feed line at my place.



2009/12/18 Elan Portnoy <elanportnoy at yahoo.com>:
> Hello all,
> In the midst of all the excitement around the new birds, I have a question for all of you:
> I have ARR preamps on both the 432 and 145 transmission lines. At the moment, they are located in shack, just before the transceiver.
> Both lines to antennas are 50 feet (15.24 meters) of LMR400. How much of a performance improvement should I expect from mast mounting the preamps? It could be done, but I'd rather keep them inside if there's nothing to be gained.
> Thanks,
> Elan - WB2IOL
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Jean-François Ménard

AMSAT www.amsat.org / Member #37102
ARRL  www.arrl.org

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