[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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  _______________________________________________
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  AMSAT-NA makes this open forum available
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