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.
73
J-F VA2SS
2009/12/18 Elan Portnoy elanportnoy@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 _______________________________________________ Sent via AMSAT-BB@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