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

Tue Apr 30 18:58:45 UTC 2019

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
> > >> _______________________________________________
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> > >> are solely those of the author, and do not reflect the official views
> of
> > >> AMSAT-NA.
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> > >>
> > >
> > _______________________________________________
> > 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
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