[amsat-bb] Linear Transponder Up and Down link frequency calculator

Tue Apr 30 19:20:47 UTC 2019

I haven't run it yet and am not on Windows currently so can't, but as to
Vinny's question, it says it's a calculator so I assume it calculates
frequencies with more precision not just every 5khz or something, right?

As for Mark's question, maybe you don't always need or want all the
features of SatPC32.

Finally, maybe it is partly an effort by Terry to see if he could do it ;-)

After all, why don't we all just pick up the phone if we need to talk to
someone who isn't within earshot?

Because we're hams!

With that said I think sharing the source code is almost always a good idea
:-)

73, John Brier KG4AKV

On Tue, Apr 30, 2019 at 3:12 PM Mark D. Johns via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> Perhaps I’m missing something, too. Why not use a full-featured tracking
> program, such as SatPC32, that has all of this already included?
>
> On Tue, Apr 30, 2019 at 13:06 Vinny Stipo via AMSAT-BB <amsat-bb at amsat.org
> >
> wrote:
>
> > Am I missing something? Why not just put this info in a online
> > worksheet/excel, rather than compile a program with no source code?
> >
> > -Vinny KM2W
> >
> > On Tue, Apr 30, 2019 at 7:01 AM Hasan al-Basri via AMSAT-BB <
> > amsat-bb at amsat.org> wrote:
> >
> > > Absolutelyl, no worries about doppler. The only one of concern was the
> > 1200
> > > Hz error and I think that was a typo. I'll look for the update. Tnx so
> > > much, it is a wonderful asset to sat ops. 73, N0AN
> > > Hasan
> > >
> > >
> > > On Mon, Apr 29, 2019 at 11:56 PM Wendy and Terry Osborne <
> > > wandtosborne at gmail.com> wrote:
> > >
> > > > Hi Hassan,
> > > >
> > > > Just added CAS-4A to the list.
> > > > I was working off the AMSAT-NA Laminated frequency chart (April
> 2018).
> > > > Should have spotted it.
> > > >
> > > > I have also tweaked the frequency on CAS-4B to track with your
> > > > measurements.
> > > > Use the same link for the updated program.
> > > >
> > > > I’m tempted to add a few hundred Hertz to the conversion numbers to
> get
> > > > them spot on but the error
> > > > is probably less than the doppler correction required.
> > > >
> > > > Trying to correct for doppler would require a built in tracking
> program
> > > > and then you might as well use SatPC32.
> > > >
> > > > 73,
> > > > Terry ZL2BAC
> > > >
> > > > *From:* Hasan al-Basri <hbasri.schiers6 at gmail.com>
> > > > *Sent:* Sunday, April 28, 2019 11:48 PM
> > > > *To:* Wendy and Terry Osborne <wandtosborne at gmail.com>
> > > > *Cc:* AMSAT-BB <amsat-bb at amsat.org>
> > > > *Subject:* Re: [amsat-bb] Linear Transponder Up and Down link
> frequency
> > > > calculator
> > > >
> > > > Very nice Terry, but you forgot CAS-4a  :-)
> > > >
> > > > I work with pre-defined sat pairs to avoid Wifi spikes. Here are the
> > > > results for some of the common birds using our downlink and your
> uplink
> > > > (predicted) vs. what our uplinks really are for perfect audio.
> > > >
> > > > CAS-4B 145.918  435.287  Actual: 435.285.900
> > > > XW-2A  145.672   435.043  : 435.042.600
> > > > XW-2B  145.733   435.107  : 435.106.800
> > > > XW-2C  145.798   435.167  : 435.166.800
> > > >
> > > > Very solid agreement, tnx so much. It would have saved  us a lot of
> > time
> > > > setting up the first time, had we had you nice program.
> > > >
> > > > Please add CAS-4A when you get time.
> > > >
> > > > 73, N0AN
> > > >
> > > >
> > > > Hasan
> > > >
> > > >
> > > > On Sat, Apr 27, 2019 at 8:41 PM Wendy and Terry Osborne via AMSAT-BB
> <
> > > > amsat-bb at amsat.org> wrote:
> > > >
> > > >> Hi Folks,
> > > >>
> > > >> With the number of Linear Transponder Satellites that are
> operational
> > or
> > > >> in the pipeline,
> > > >> I thought a simple program to convert uplink to downlink frequencies
> > was
> > > >> worth writing.
> > > >> I’ve written one for Windows.
> > > >> You can find it here:
> > > >>
> > >
> >
> https://www.dropbox.com/sh/4o375h6bygjxkzr/AABi9Ck9Wc6ODrhXwIVHxI-_a?dl=0
> > > >> I’ve put the exe file and the same file in zip format.
> > > >> I have put all the current birds plus the ones that have launches
> > > pending.
> > > >> Just select the satellite of interest from the “Satellite” drop down
> > > >> menu,
> > > >> put your frequency into the text box and hit the Up or Dn calculate
> > > >> button.
> > > >>
> > > >> Let me know if you think this is useful.
> > > >>
> > > >> 73,
> > > >> Terry Osborne ZL2BAC
> > > >> _______________________________________________
> > > >> 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
> > > >>
> > > >
> > > _______________________________________________
> > > 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
> > >
> > _______________________________________________
> > 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
> >
> --
> --
> Mark D. Johns
> KØJM / MØGZO / ex-9H3DJ / ex-KØMDJ
> Brooklyn Park, MN USA   EN35hd
> -----------------------------------------------
> "Heaven goes by favor; if it went by merit,
>    you would stay out and your dog would go in."
>     ---Mark Twain
> _______________________________________________
> 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
>