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Re: re: QRM 2m, question for sat builders



Path loss has no effect as the cosmic background noise and the satellite
signal are attenuated at the same rate.

73,

John
KD6OZH

----- Original Message -----
From: "Andrew Glasbrenner" <glasbrenner@mindspring.com>
To: "John B. Stephensen" <kd6ozh@verizon.net>; "William Leijenaar"
<pe1rah@yahoo.com>; <amsat-bb@amsat.org>
Sent: Tuesday, February 15, 2005 00:01 UTC
Subject: Re: [amsat-bb] re: QRM 2m, question for sat builders


>
>
> >Higher frequencies are advantageous for downlinks as cosmic noise
decreases
> >at 6 dB per octave and less power is needed at the satellite.
>
> Isn't this offset by path loss?
>
> >For digital
> >amateur satellites licensed in the U.S. there is a bandwidth limitation
is
> >20 kHz on 2 meters and 100 kHz on 70 cm. Downlinks usually need to be
faster
> >than uplinks.
>
> Best reason I've seen yet, and what I suspect is the real core of the
issue on satellites including a digital downlink. Thanks for the
explanation.
>
> 73, Drew KO4MA
----
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