[amsat-bb] Re: Center of the transponder

Erich Eichmann erich.eichmann at t-online.de
Sat Mar 17 04:00:51 PDT 2012

the file Doppler.SQF that comes with SatPC32 sets the radio frequencies of a
linear transponder to the center of the uplink and downlink passbands +/-
Doppler shift. But that can easily be changed. If you want to start  - for
example - on a downlink frequency 10 KHz above the center do the following:
Select the satellite (even if it is out of range). With the VFO knob or the
frequency controls of the program tune the downlink frequency 10 KHz up.
Then open menu CAT, click the button "Change/Store Data File" and in the
window that opens click on "Change/Store Rx/Tx Frequency Data". At the next
program start the radio will be set to the new frequencies.

With this methode you can also easily specify an entry for a beacon

73s, Erich, DK1TB

----- Original Message ----- 
From: "Andrew Glasbrenner" <glasbrenner at mindspring.com>
To: "amsat-bb" <amsat-bb at amsat.org>
Sent: Saturday, March 17, 2012 1:48 AM
Subject: [amsat-bb] Center of the transponder

> Fellow satellite operators,
> There is nothing particularly magical about the center of the transponder
> on VO-52 or FO-29. In fact, on FO-29 it is the poorest sounding place in
> the entire passband. Just because SatPC32 puts you there with the default
> Doppler.SQF configuration, does not mean every single QSO should take
> place there. Spread out a little, listen to what is going on, and we'll
> all make more, and happier, QSOs.
> I might also add that if a rare station pops up, or makes a habit of
> operating in one spot, it might be beneficial to call CQ the entire pass
> somewhere other than the middle of the pile.
> Even with the previous observations, it is nice to hear many new calls on
> the transponders. Just remember this isn't AO-51 or AO-27...spin the VFO a
> bit. I'm looking forward to Funcube and the other new transponders this
> September.
> 73, Drew KO4MA
> _______________________________________________
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