[amsat-bb] Re: Pre-amps

Tony Langdon vk3jed at gmail.com
Sat Dec 22 17:56:40 PST 2007

At 11:38 AM 12/23/2007, Andrew Rich wrote:

>So I took a gamble and put in the VHF parts instead.
>Bingo S1 to S9 improvement.

OK, but the important thing is what is the improvement in S/N?  If 
the preamp has too high a noise figure, all you'll end up doing is 
moving the S meter a bit more...   What you're aiming to do is 
improve the S/N of the received signal.

If the S/N doesn't change, you will still gain an improvement by 
siting the preamp at the masthead.  If it does improve with the 
preamp at the radio, the improvement will be even more with the 
amplifier correctly installed at the antenna.

73 de VK3JED

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