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

[Hasan al-Basri]

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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>