[amsat-bb] AO-7 transponder pan view

[Eduardo Erlemann]

I think it is caused due the components age/conditions which is affecting its receiver linearity, noticed even in a such narrow band.

73s

Ed PY2RN
GG66LW
--------------------------------------------
On Wed, 11/25/15, Joe <nss at mwt.net> wrote:

 Subject: Re: [amsat-bb] AO-7 transponder pan view
 To: amsat-bb at amsat.org
 Date: Wednesday, November 25, 2015, 12:08 PM
 
 Thats pretty cool.
 Is it a part of the filtering in this old gal,
 or what causes it?
 
 Joe
 WB9SBD
 Sig
 The Original
 Rolling Ball Clock
 Idle Tyme
 Idle-Tyme.com
 http://www.idle-tyme.com
 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.
 >
 > 73,
 >
 > Dani M0HXM/EA4GPZ.
 >
 >
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 _______________________________________________
 Sent via AMSAT-BB at amsat.org.
 AMSAT-NA makes this open forum available
 to
 all interested persons worldwide without requiring
 membership. Opinions expressed
 are solely
 those of the author, and do not reflect the official views
 of AMSAT-NA.
 Not an AMSAT-NA member? Join
 now to support the amateur satellite program!
 Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb