[amsat-bb] Trying to understand downlink corrections

[W3AB/GEO]

Bird speed and altitude?

⁣___
Sent from my two way wrist watch
73 de W3AB/GEO​

On Jul 10, 2018, 11:24, at 11:24, Pedro Converso <pconver at gmail.com> wrote:
>Umesh,
>
>You're right, some satellites i.e AO-91, AO-73 do show temperature and
>solar illumination afects frequency, other possible cause is older TLE
>keplers data. ( For often updated keps try
>http://amsat.org.ar/keps.txt )
>
>Learn is a never ending activity :)
>
>73, LU7ABF, Pedro
>
>On 7/10/18, k6vug at sbcglobal.net <k6vug at sbcglobal.net> wrote:
>> Greetings,
>> I have been using a SDR dongle to receive the downlinks of SSB
>satellites.
>> The combination of SatPC32's Downlink Correction feature and the
>SDR's
>> visual display helps to zero beat the CW beacon exceptionally well. 
>The
>> Lat/Lon is good to 6 decimals.  However, I find that the downlink
>correction
>> needed is quite different for different satellites. Could it be due
>to
>> rounding off errors or due to temperature variations at the satellite
>itself
>> ?   Maybe this has been explained earlier, but I wonder why ?
>>
>> Obviously, the more I learn, shows how less I know...  Thanks for any
>> pointers !
>>
>> 73!
>> Umesh
>> k6vug
>>
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