It is a SNR (signal to noise ratio) matter, if you position your TX on the top of the hill you can hear it stronger but the noise is also stronger, if you slip to the mid of the valley your signal will be weaker but noise as well. In a practical experiment (using my ears) I noticed a better SNR relationship staying in between the valley and the hill, which will be very difficult to find for who uses a regular rig for RX.

73 Ed PY2RN GG66LW -------------------------------------------- On Wed, 11/25/15, Joe [email protected] wrote:

Subject: Re: [amsat-bb] AO-7 transponder pan view To: "Eduardo Erlemann" [email protected], [email protected] Date: Wednesday, November 25, 2015, 1:25 PM

So,

For best results you want to place your signal in the valleys true?

Joe WB9SBD

Sig

The Original Rolling Ball Clock

Idle Tyme

Idle-Tyme.com

http://www.idle-tyme.com

On 11/25/2015 8:52 AM, Eduardo Erlemann wrote:

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 [email protected] wrote:

Subject: Re: [amsat-bb] AO-7 transponder pan view To: [email protected] 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 [email protected]. 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