There is no IQ file from this observation.
Hi K4KDR,
Thanks for taking the time to decode the Skylink IQ file!
- Regarding the framing, no, itâs not ENDUROSAT.
- Iâve checked the IQ sample, and there are 2 valid frames in the file.
- As for the FM deviation, itâs set to ±25 kHz.
Appreciate your effort, and let me know if you think of anything else that could help refine the setup!
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Thank you for the reply!
What IS the baud rate & framing, then?
Hi again,
The baud rate is set to 9600 baud, and the framing is customâmeaning we have a proprietary ICD (Interface Control Document) in use.
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Hi Jan,
Great catch. Suggested or updated tle based on this observation?
Tks,
Bob
N6RFM
Hi Bob,
At the moment we have no idea what satellite is transmitting on this frequency.
I only know that it seems to be part of the T12 launch.
Maybe we need to add an unknown T12 satellite with this frequency as transmitter in the database.
On the other hand, I was hoping someone could suggest that this frequency is used by a satellite that is already in the database.
Jan - PE0SAT
Hi again,
Thanks for the update and the observation @K4KDR!
We analyzed the provided TLE and the faint signal you detected. Based on your note that the signal is approximately 1 minute ahead of the given TLE, we cross-referenced it with the TLEs provided by Space-Track. After analysis, we narrowed it down to 7 potential TLEs that could correspond to Skylink within the approximate time range:
NOMINATED 1
1 88407U 25009BY 25031.94383369 .00005429 00000-0 54354-3 0 00220
2 88407 97.7469 114.2085 0001097 257.3058 102.8038 14.91803374002542
NOMINATED 2
1 88408U 25009BY 25032.01016098 .00011550 00000-0 11447-2 0 00229
2 88408 97.7448 114.2743 0001455 285.4809 74.6249 14.91960784002555
NOMINATED 3
1 88409U 25009BY 25031.94337852 .00006443 00000-0 64305-3 0 00233
2 88409 97.7476 114.2094 0001009 246.4582 113.6530 14.91861322002540
NOMINATED 4
1 88410U 25009BY 25031.80958570 .00004294 00000-0 43129-3 0 00217
2 88410 97.7489 114.0779 0000953 216.2781 143.8373 14.91785829002522
NOMINATED 5
1 88411U 25009BY 25031.94324856 .00004419 00000-0 44313-3 0 00234
2 88411 97.7464 114.2091 0000729 266.0152 94.0983 14.91834899002549
NOMINATED 6
1 88412U 25009BY 25031.94342579 .00002542 00000-0 25763-3 0 00230
2 88412 97.7434 114.2066 0001421 313.0246 47.0854 14.91786820002541
NOMINATED 7
1 88413U 25009BY 25031.94241873 .00004124 00000-0 41329-3 0 00241
2 88413 97.7448 114.2082 0000793 316.5957 43.5200 14.91901066002540
Until new information becomes available, we suggest testing these TLEs to narrow down the possibilities further.
@fredy, if you could also take a look at these TLEs and provide your insights, that would be much appreciated!
Let us know if thereâs anything else we can do to help refine the search!
HADES-R TLE Update
HADES-R
1 98710U 25009BY 25033.52999688 .00000000 00000-0 -14212-2 0 06
2 98710 97.4429 116.0614 0003354 352.9277 125.3596 15.17527919 09
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INNOCUBE TLE Update:
INNOCUBE
1 98709U 25033.47028053 .00000000 00000-0 10880-2 0 07
2 98709 97.4389 115.7401 0007295 359.8410 128.8387 15.16514154 07
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QSL Jan.
Will make some recordings to see if we can shed more light on the question.
73,
Bob
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that would be great, please share them if you can.
The signal from an unknown satellite on 437.780 is a similar FSK signal as used by HADES-R and URESAT, but I am unable to decode it with the known, provided decoders. (It is also passing at a similar moment as HADES-R)
Attached an audio recording of the signal
Unknown_20250203_437783617Hz_AF.zip (2.0 MB)
The search continues
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Thanks update Jan. Will narrow the times to be QRV for these. Will report back.
âAppearsâ to be some kind of AFSK with tones at 1090 Hz & 2200 Hz, but I tried various baud rates & other settings but was not able to get anything to decode. Iâm sure the right combination is in there somewhere & just eluded me!
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Hi,
This is HYDRA-T. It is very similiar to HADES-R. Both satellites were launched together. It carries an experiment for UC3M University but this satellite is not operated by AMSAT. It canât be used as a repeater but if there is interest in decoding telemetry I think we can ask and add it to Andy Soundmodem.
FĂ©lix
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Thank you very much for this information, a decoder would be appreciated.
For now, and will change !!
HYDRA-T
1 98655U 25009BY 25035.44396941 .00000000 00000-0 33749-2 0 05
2 98655 97.4429 118.0277 0003354 352.9277 135.8245 15.17811801 07
EDIT: Updated the TLE to use the temporary NORAD ID we use in DB
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@ea4gqs am I right to think that HYDRA-T is a non-amateur satellite owned and operated by Hydra Space, a private company part of whose members also belong to the satellite development team at AMSAT-EA, and that HYDRA-T is transmitting in the 70cm Amateur satellite band without IARU coordination and potentially without a license (since I am not aware of commercial Spanish satellites being able to use this spectrum)? Or have I missed something that makes the situation different from what I am describing here?
Hi,
Daniel, yes youâre right. This is not an amateur satellite. The frequency it is using is legal but it should not be here.
I can only say that I am sorry because I am part of the team who made it and, althought I didnât choose the frequency for it I should have fought more to move it outside the band.
The consultant the company asked for it, said it was legal to use that frequency but it has not been a good idea at all.
I can only apologize and ask you all for your patience.
I am going to put pressure so the satellite is powered off. At this moment, I think the only solution so nobody is harm, and specially the University, would be to turn on the satellite just at some moments to take data from the experiment and having it off the rest of the time.
FĂ©lix EA4GQS
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Felix,
A decoder would be very much appreciated or at least sufficient details so that other decoding tools might be used.
TKS es 73,
Bob
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