[amsat-bb] AO-7 transponder pan view
nss at mwt.net
Wed Nov 25 14:08:38 UTC 2015
Thats pretty cool.
Is it a part of the filtering in this old gal, or what causes it?
The Original Rolling Ball Clock
On 11/25/2015 3:21 AM, Daniel Estévez wrote:
> El 24/11/15 a las 23:20, Joe escribió:
>> what are the three hills about?
> That's just noise from the passband of AO-7 transponder. It's stronger
> in three spots, one on the middle of the passband and two near the
> edges. These spots are quite strong, in fact comparable to some of the
> stations. If you look closely, you can also see that these spots get
> frequency modulated with the strong transmissions.
> This is one of those things that it's quite difficult to see on a
> traditional receiver but it's quite apparent on an SDR waterfall.
> Dani M0HXM/EA4GPZ.
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