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Re: Something OLD, Something NEW



The transponder was designed not to crank the gain up until the noise
reaches the full power level in order to minimize power consumption. I don't
know exactly how they set things up on AO-40, but AO-10 and AO-13 were
designed so that the noise level was 20 dB below full output.

73,

John
KD6OZH

----- Original Message -----
From: "Douglas Braun NA1DB" <doug@dougbraun.com>
To: "hasan schiers" <schiers@netins.net>; <amsat-bb@AMSAT.Org>
Sent: Friday, 18 May 2001 16:54 UTC
Subject: Re: [amsat-bb] Something OLD, Something NEW


> Hello,
>
> A couple of questions here:
>
> If the big guns are raising the AGC a lot (let's assume LEILA is off),
> then the passband noise would be suppressed, right?
>
> Also, if nobody is working the transponder, then the satellite's gain
> will be cranked up all the way, and it will be re-transmitting
> nothing but passband noise at full power, right?
>
> I guess you have to listen for the passband noise when the AGC is
> at a "typical" value during normal operation.
>
> Doug
> NA1DB
>
> At 11:30 AM 5/18/01 , you wrote:
>
> >When you can clearly hear the "passband" noise of the satellite itself,
no
> >further improvement will help. Until you can hear it clearly....your
system
> >is not as good as it can get.
>
> ----
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