[amsat-bb] Satellite Hiatus--Doppler.SQF

[Stefan Wagener]

Les and others,



Sorry, but why is this so difficult?



Kepplerian elements are numerical data describing the orbit of a satellite.
Math based on certain algorithms presented in 2 line format via service
providers like Spacetrak and Celestrak generated by NORAD.



These “keps” will never include any information on what frequencies a
satellite uses, since this is totally irrelevant and useless information
for describing the orbit of a satellite. NORAD the originator of our
orbital data does not, will not and should not care about a certain
satellite frequency on 2m or 70cm. They just track orbital objects.



SatPC32 will use any 2 line element source you tell it to use and track the
satellite just fine. For tracking it just needs that information. Now,
SatPC32 also allows for doppler correction and radio control of
frequencies. It is handled by a small text file called doppler.sqf. That
file will need someone to tell it what the new frequencies are and for what
satellite. The author of SatPC32  “Erich Eichman” has no idea, or crystal
ball or visions in his dreams of which frequency a new satellite will use.
That’s why he has given us the ability to edit the file as we seem fit.



The only requirement is that the name of the satellite matches the name of
the satellite that you selected with your keps. How else would the software
know? Any and all satellite tracking software that does doppler control
will require some sort of that input. SatPC32 does not have a magical wand
or AI to do that for you.



As of this moment we have maybe around 20 satellites that have some sort of
amateur transponder and folks are finding it difficult editing a simple
text file to match a satellite name and add some frequencies? All this
information is available online.



Copying someone’s doppler.sqf file is also not a good idea! That file is
customized by someone based on the keps and satellite name they are using
and sometimes even specific for their location since SatPC32 lets you
adjust the doppler control based on your location and satellite and
internally adjust the doppler.sqf frequencies.



The author of SatPC32 has spent thousands of hours working on this program
and he gets no financial return. He has donated the software to AMSAT and
still updates it for new radios and features! Complaining about that is
just not right!



Hope that helps.



73 Stefan VE4SW



On Sat, Jun 6, 2020 at 9:03 PM Les Rayburn via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> So I cut and pasted the new Doppler.SQF file from JE9PEL / Mineo Wakita
> site. Restarted, but none of the satellites will track frequency. I assume
> this is due to a difference in the naming conventions in the Kep file.
>
> I use “NASA ALL” for my keps. Not certain which version Mineo uses for
> his.
>
> Hate to complain about software when the proceeds are going to support
> AMSAT (much appreciated). But why does this have to be so difficult? It
> really should be as easy as “update Keps” and everything syncs.
>
> Two pet peeves-
>
> - The lack of standardization in how satellites are named. And then they
> change names. This causes confusion and incompatibility with software,
> tracking apps, etc. Why not settle on a standard and stick to it?
>
> -The lack of modern GUI and user-friendly software for the amateur
> satellite community. If someone suggests open-source nonsense, my head
> might explode. Happy to pay handsomely for anyone who codes something to
> make this all easier.
>
> When I find another few hours with nothing to do, I’ll try to edit the
> Doppler.SQF file to match, troubleshoot until it works, etc.
>
> Thanks anyway. Probably won’t see me back on the birds this weekend. My
> hobby time is too limited.
>
>
>
> 73,
>
> Les Rayburn, N1LF
> Maylene, AL
> EM63nf
> AMSAT #38965, ARRL Life Member, CVHS Life Member, SVHF Member
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>