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

Wed May 1 02:19:22 UTC 2019

I think you’re both missing something. The developer created a tool to suit a particular purpose for them. Both of your approaches are like suggesting a multi-tool when all they need to do is cut a string with a pocket knife.  

73,
Mike Diehl
W8LID/VE6LID 

> On Apr 30, 2019, at 14:58, 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.
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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
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>>> AMSAT-NA.
>>> Not an AMSAT-NA member? Join now to support the amateur satellite
>> program!
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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!
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>> 
> -- 
> --
> 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!
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