[amsat-bb] AO-7 transponder pan view
Eduardo Erlemann
sasb.geo at yahoo.com
Wed Nov 25 15:34:02 UTC 2015
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 <nss at mwt.net> wrote:
Subject: Re: [amsat-bb] AO-7 transponder pan view
To: "Eduardo Erlemann" <sasb.geo at yahoo.com>, amsat-bb at amsat.org
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 <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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