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Re: Newbie Question: How do I know I am hearing the noise floor of the transponder?



Along the same lines, I've been wondering if anyone has noticed a change in
the noise floor since there are only two receivers feeding the downlink now.
It would probably be a very small change on the order of 1.8 dB.


Lee-KU4OS

----- Original Message ----- 
From: "Edward R. Cole" <al7eb@ptialaska.net>
To: "Bill Acito W1PA" <w1pa@hotmail.com>; <amsat-bb@AMSAT.Org>
Sent: Wednesday, May 28, 2003 18:23 PM
Subject: Re: [amsat-bb] Newbie Question: How do I know I am hearing the
noise floor of the transponder?


> At 04:44 PM 5/28/03 -0400, Bill Acito W1PA wrote:
> >Lots and lots of discussions about making sure RX systems are optimized
> >on AO-40. How do I know I am hearing the noise floor of the transponder?
> >
> >Bill
> >W1PA
>
>
> Bill,
>
> Its easy.
>
> First optimize your pointing onto the satellite and listen to a blank
> frequency (no signals present).
> Note the noise level on your s-meter.
> Now off-point your 2.4 GHz antenna from the satellite (but still looking
up
> into the sky).
> Note the s-meter reading now.

----
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