k6vug at sbcglobal.net
k6vug at sbcglobal.net
Mon Jun 24 05:07:07 UTC 2019
To add a bit of personal experience - calibrating the uplink forced both stations "walk" the band during the QSO. Eventually, realized that adjusting the downlink instead was a better choice, and has been smooth sailing since.
Technically speaking, the calibration of the downlink takes care of abnormalities in the entire chain and that lets the program (SatPC32 etc.) ensure that the uplink is spot-on any time you pan the downlink, during the pass.
(Disclaimer - while there are a different schools of thought, the above is solely based on personal observations, failures and successes. Individual mileage may vary.)
On Sunday, June 23, 2019, 4:49:12 PM PDT, Bob via AMSAT-BB <amsat-bb at amsat.org> wrote:
The manual is your friend. The secret sauce is to adjust your uplink on
the CAT menu until you can hear yourself, then save the uplink calibration.
Trying to tune the radio knob caused both the uplink and downlink to change
and is not how you calibrate things, but is exactly the behavior you want
(manually tuning to find someone to call, and being spot on with your
downlink too. I do feel sorry for the folks, hundreds (thousands?),
vainly sending dots/dashes during Field Day attempting to find themselves.
The secret sauce is to do that before Field Day. With the exception of
AO-7 which was unusually far off, all the other dozen+ satellites were
within a couple hundred hertz or less of the calibration values I use at
home on my 9100 (in a fairly stable thermal environment).
Good luck, but rest assured that SatPC32 works great controlling Doppler.
73, Bob, WB4SON
On Sun, Jun 23, 2019 at 5:49 PM Bruce via AMSAT-BB <amsat-bb at amsat.org>
> I bought a Yaesu G5500 to use during field day this year, we got tired
> of the arm strong rotor. This is the first time I have used SATPC32 for
> anything more than AOS-LOS predictions. I still moved the rotor by hand.
> Have not been able to get the Yaesu cable built to have the LVB tracker
> control the rotor. May work on that for next year.
> Used the ICOM IC-9100 and a laptop this year. It worked great to set the
> frequency for the FM satellites but was horrible for any SSB satellite.
> I can find myself with the computer turned off. When I tried to use
> Satpc32, it would jump to somewhere in the passband and no matter how i
> tried to adjust the radio to find myself, satpc32 had a mind of its own.
> So, never made an SSB contact. Of course it is more fun to do this
> during field day with everyone watching.
> So what is the secret for making Satpc32 see where you have found the
> sweet spot on the up and down link when you click CAT control instead of
> doing what it wants? I would have thought it would read the settings
> from the radio and go from there. After all, it takes me a few seconds
> to find myself and really easier to adjust for Doppler manually. I
> wanted to give the automated feature a go for those watching.
> Bruce Paige, KK5DO
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