[amsat-bb] SatPC32 Doppler problem

Erich Eichmann erich.eichmann at t-online.de
Sun Oct 23 10:36:17 UTC 2016

Hello Mark,
try the following:
Track a FO-29 pass and find your signal using the "Upl. Corr." up/down 
controls in menu "CAT". Fine tune the uplink for best audio (best around 
the middle of the pass).  Then click the "Change/Store Data File" in  
menu "CAT" and in the little window that opens click on "Upl. 
Correction". That will save the correct uplink frequency. That is easier 
and more reliable than to enter observed frequencies manually in 
Doppler. SQF.

At the next program start you should immediately hear your signal. 
Little  deviations (100 ... 300 Hz) may remain due to temperature 
differences at the sat or the radio. You can easily correct them using 
the ± keys of the numerical pad with a few hits in steps of 100 Hz. (The 
keys work only if SatPC32 must be the active program  - blue header line).

73s, Erich, DK1TB

Am 22.10.2016 um 22:32 schrieb Mark Johns via AMSAT-BB:
> For some reason, my SatPC32 has stopped correctly compensating for Doppler shift on FO-29. I'm continually having to "find myself" all over the passband, making adjustments throughout the pass, just like the old days when everything was manual.
> I've updated the Keps. I marked the uplink and downlink freqs at time of closest approach on a high-elevation pass, and re-edited my Doppler.SQF with those numbers.
> SatPC32 is talking to the rig, and it does make regular changes to both uplink and downlink frequencies -- they just happen not to be correct.
> I'm stumped! Any thoughts?--
> Mark D. Johns, KØMDJ
> Decorah, Iowa USA  EN43
> -----------------------------------------------
> "Heaven goes by favor; if it went by merit,
>     you would stay out and your dog would go in."
>       ---Mark Twain
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