[amsat-bb] FW: Doppler file

Thu Dec 20 01:36:42 UTC 2018

Keps are the Keplarian elements that define a satellite’s orbit and are used to predict its location.  You have to update these every few days (daily for ISS, which reboots its orbit from time to time).  You trigger the update manually, using the Update Keps button, and specify the update source for the keps — the nasabare keps from AMSAT are a good choice (they include AO-85).

The sqf file contains information that defines the operational modes of a satellite (frequencies, tones, modulation, and so on).  This info gets entered once when the satellite is new.  It might need to change if the frequency drifts with age or if a new satellite isn’t operating as expected, but generally remains fixed.  You edit this file with a text editor.

Dave, W8AAS

> On Dec 19, 2018, at 8:11 PM, Ted Krempa <k7trkradio at charter.net> wrote:
> 
> Thank you....it sounds like I have a misunderstanding about keps vs sql....I'll read up on that
> 
> Thank you, again
> 
> 73, Ted
> K7TRK
> 
> -----Original Message-----
> From: Stephen E. Belter [mailto:seb at wintek.com] 
> Sent: Wednesday, December 19, 2018 4:54 PM
> To: Bob
> Cc: Ted Krempa; AMSAT-BB
> Subject: Re: [amsat-bb] FW: Doppler file
> 
> Ted,
> 
> There is a window that allows you to download and update the Keps.  Any changes to the sqf files for new satellites or modes are performed by you manually. 
> 
> 73, Steve N9IP 
> --
> Steve Belter, seb at wintek.com
> 
> 
>> On Dec 19, 2018, at 7:00 PM, Bob <WB4SON at gmail.com> wrote:
>> 
>> Hi Ted,
>> 
>> As nice as it would seem, it really isn't possible to automatically update
>> the DOPPLER.SQF file.  The most important reason is that each station has a
>> different transmit and receive offset due to different RX and TX chain
>> frequency calibration, drift, etc.  It would be possible to have a baseline
>> SQF file (without compensation) and a few hams do publish that.
>> 
>> You can manually update the Kep files yourself.
>> 
>> 73, Bob, WB4SON
>> 
>> 
>>> On Wed, Dec 19, 2018 at 6:36 PM Ted Krempa <k7trkradio at charter.net> wrote:
>>> 
>>> Hello, can anyone else answer my question below.....(Joanne must be busy)
>>> 
>>> Thanks, Ted
>>> K7TRK
>>> 
>>> -----Original Message-----
>>> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Ted Krempa
>>> Sent: Monday, December 17, 2018 3:49 PM
>>> To: 'JoAnne Maenpaa'; 'Dave'
>>> Cc: amsat-bb at amsat.org
>>> Subject: Re: [amsat-bb] Dobbler file
>>> 
>>> Good stuff, Joanne...thanks
>>> 
>>> One thing, though, that I have never understood, however:  Does SatPC32
>>> properly update keps and the sqf data when the 'update' option is used in
>>> the program? Or do we need to keep updating manually. I can understand with
>>> a new sat, manually trying to find the right data, but after the sats are
>>> rolling along for a few weeks the normal sites that identify keps usually
>>> have that data current.
>>> 
>>> Thanks for any input
>>> 
>>> 73, Ted
>>> K7TRK
>>> 
>>> -----Original Message-----
>>> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of JoAnne
>>> Maenpaa
>>> Sent: Monday, December 17, 2018 5:54 AM
>>> To: 'Dave'
>>> Cc: amsat-bb at amsat.org
>>> Subject: Re: [amsat-bb] Dobbler file
>>> 
>>> Perhaps these messages from the amsat-bb from a few weeks ago might offer
>>> a starting point?
>>> 
>>> https://www.amsat.org/pipermail/amsat-bb/2018-October/069839.html
>>> https://www.amsat.org/pipermail/amsat-bb/2018-November/070451.html
>>> 
>>> --
>>> 73 de JoAnne K9JKM
>>> k9jkm at amsat.org
>>> 
>>> 
>>>> -----Original Message-----
>>>> From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Dave
>>>> Sent: Monday, December 17, 2018 7:40 AM
>>>> To: James McIrvin
>>>> Cc: amsat-bb at amsat.org
>>>> Subject: Re: [amsat-bb] Dobbler file
>>>> 
>>>> I’m not sure if you received a private response but I have a similar
>>> issue.
>>>> I tried to use SatPC32 the other day and found many of the satellite
>>>> frequencies were not correct. I’m going to have manually edit a bunch of
>>>> them unless I can find someone with a good set of files.
>>>> 
>>>> Dave
>>>> N2OA
>>> 
>>> 
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>>> to all interested persons worldwide without requiring membership. Opinions
>>> expressed
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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: http://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: http://www.amsat.org/mailman/listinfo/amsat-bb