[amsat-bb] CAS4A CAS4B SDR recordings?
godetj at wanadoo.fr
Sat Jun 17 09:46:28 UTC 2017
Hi Douglas, all!
I'm late as Scott just shared his full pass excellent i/q file and
If this can help, I recorded only 50 secondes of the last pass over
western Europe (orbit nr 32) so that the files don't become too large.
A 32-bit floating point raw i/q file (for Gqrx, etc...):
The same one translated in a PCM 16-bit wav file (for SDR#, etc...):
The full 199 frames of this 50 seconds record (text hexa):
And the sound of space with the CW telemetry (mp3):
Have a nice w.-e.!
On 16/06/2017 19:03, Jean-Pierre Godet wrote:
> Douglas, if this can help, you will find here :
> 152 frames of the pass, orbit nr 17, this morning June 16th, starting at
> 0730 UTC, each frame 147 bytes (coded hexa).
> 73 !
> J-P F5YG
> On 16/06/2017 18:31, Jean-Pierre Godet wrote:
>> Hi Douglas, all,
>> On the next passes over the south of western Europe, tomorrow
>> morning, I will record an i/q file and give you a link to download it
>> (caution : 1 mn ==> 100 MB).
>> Despite the fact that the two birds here never climbs very high
>> above the horizon, maybe 30 deg., the signal is very strong and the
>> demodulation of the 4800 bps GMSK telemetry very easy. During the
>> pass, you doesn't lose a frame.
>> Conditions : GPA + preamplifier in the attic, FCD-Pro+, Gqrx (SDR
>> prgm), Gpredict (Doppler shift tracking), DireWolf 1200/2400/4800/9600
>> bps FSK/GMSK demodulator).
>> Have a nice evening, 73 !
>> J-P F5YG
>> On 16/06/2017 16:30, Douglas Quagliana wrote:
>>> Does anyone have an SDR recording of CAS4A / CAS4B? I would like to
>>> try to demodulate and decode the 4800 baud telemetry signals and see
>>> what they say.
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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
>> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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