Hi @isispace_wubb and welcome!
Thanks for the frequencies, it seems we have caught signals for both CSC sats. Any idea which modulation is used and its baudrate/bandwidth?
New TLE for CSC-1:
CSC-1
1 99040U 23282.58000000 .00000000 00000-0 00000-0 0 05
2 99040 97.6320 351.0344 0015202 88.5092 154.1449 14.99591684 07
csc1_282.dat (1.3 KB)
sites.txt (3.3 KB)
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Looked at some VERY strong packets from
https://network.satnogs.org/observations/8301482/
… and they appear to be quite narrow, suggesting 1200, etc.
However, I was not able to get any decodes with any of the FSK framings, so perhaps something other than FM demod is required.
I’ll try to get an I/Q recording when they come around again, but if anyone would like to share a clean I/Q of these objects, I’ll be glad to take a look.
Thanks!
-Scott
Hi Scott try BPSK
Hello!
Yes, that’s the plan when I have an I/Q recording to work with.
Since the SatNogs ‘Observations’ only include audio files, I’m restricted to whatever demod was used for each particular recording.
Yes that is indeed the case, one of the reasons I automatically create IQ files for every observation.
In the meantime I also added a BPSK transmitter for CSC-1, lets see if that will create decodes or can be used for an alternative external decoder. (keep the --f_offset 12000 in mind when using gr-satellites with such a audio recording)
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Ten TLE sets from space-track.org, most of the in TBA status. We expect 2 more TLE sets:
0 OBJECT A
1 58016U 23155A 23282.48861286 -.00000056 00000-0 00000+0 0 9997
2 58016 97.9312 351.4736 0001509 6.6461 88.4778 14.87992230 52
0 OBJECT B
1 58017U 23155B 23282.48860130 -.00000056 00000-0 00000+0 0 9995
2 58017 97.9299 351.4709 0002169 47.9673 47.3521 14.88184396 50
0 TBA - TO BE ASSIGNED
1 58018U 23155C 23282.76518029 -.00000058 00000-0 00000+0 0 9996
2 58018 97.6689 351.5691 0005308 355.9876 164.5648 14.98659302 98
0 TBA - TO BE ASSIGNED
1 58019U 23155D 23282.76497633 -.00000058 00000-0 00000+0 0 9994
2 58019 97.6706 351.5686 0005384 356.5137 163.0086 14.98690318 96
0 TBA - TO BE ASSIGNED
1 58020U 23155E 23282.75793056 -.00000058 00000-0 00000+0 0 9993
2 58020 97.6680 351.5599 0004476 354.1422 127.6948 14.98828211 92
0 TBA - TO BE ASSIGNED
1 58021U 23155F 23282.76487869 -.00000058 00000-0 00000+0 0 9997
2 58021 97.6710 351.5692 0002822 16.0842 143.7621 14.99058231 99
0 TBA - TO BE ASSIGNED
1 58022U 23155G 23282.76477463 -.00000058 00000-0 00000+0 0 9997
2 58022 97.6689 351.5658 0002849 21.2955 138.0420 14.99093927 94
0 TBA - TO BE ASSIGNED
1 58023U 23155H 23282.76429510 -.00000058 00000-0 00000+0 0 9998
2 58023 97.6698 351.5690 0000916 341.0135 176.9094 14.99608926 96
0 TBA - TO BE ASSIGNED
1 58024U 23155J 23282.75751249 -.00000058 00000-0 00000+0 0 9995
2 58024 97.6700 351.5605 0000397 261.0369 220.5459 14.99717915 90
0 TBA - TO BE ASSIGNED
1 58025U 23155K 23282.76477977 -.00000059 00000-0 00000+0 0 9991
2 58025 97.6677 351.5726 0002313 276.0969 245.0694 14.99895906 90
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A status update:
| Temporary NORAD ID | Satellite | NORAD ID to follow | Other NORAD IDs | Identified | Deployed | Last Update |
|---|---|---|---|---|---|---|
| RECEIVED | ||||||
| 99040 | CSC-1 | 58021 | 58018(unlikely), 58019(unlikely), 58020(unlikely), 58022, 58023(unlikely), 58024(unlikely), 58025(unlikely) | NO | YES | Choose to follow 58021, other possible 58022, unlikely possible 58018-58020 and 58023-58025 |
| 99039 | CSC-2 | 58022 | 58018(unlikely), 58019(unlikely), 58020(unlikely), 58021, 58023(unlikely), 58024(unlikely), 58025(unlikely) | NO | YES | Choose to follow 58022, other possible 58021, unlikely possible 58018-58020 and 58023-58025 |
| 99044 | ANSER LEADER | 58018 | 58019, 58020, 58021(unlikely), 58022(unlikely), 58023(unlikely), 58024(unlikely), 58025(unlikely) | NO | YES | Received but not sure if this is the satellite, choose to follow 58018, other possible 58019 and 58020, unlikely possible 58021-58025 |
| 99042 | ANSER FOLLOWER 2 | 58019 | 58018, 58020, 58021(unlikely), 58022(unlikely), 58023(unlikely), 58024(unlikely), 58025(unlikely) | NO | YES | Received but not sure if this is the satellite, choose to follow 58019, other possible 58018 and 58020, unlikely possible 58021-58025 |
| 99043 | ANSER FOLLOWER 1 | 58020 | 58018, 58019, 58021(unlikely), 58022(unlikely), 58023(unlikely), 58024(unlikely), 58025(unlikely) | NO | YES | Received but not sure if this is the satellite, choose to follow 58020, other possible 58018 and 58019, unlikely possible 58021-58025 |
| NOT RECEIVED WITH FREQUENCY | ||||||
| 99045 | ESTCube-2 | 58023 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58023 to follow |
| 99034 | TRITON | 58016 | 58017 | NO | YES | Random Choice to follow between the two (58016,58017) possible: 58016 |
| 99035 | THEOS-2 | 58017 | 58016 | NO | YES | Random Choice to follow between the two (58016,58017) possible: 58017 |
| 99038 | PVCC | 58024 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58024 to follow |
| NOT RECEIVED WITHOUT FREQUENCY | ||||||
| 99041 | PRETTY | 58024 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58024 to follow |
| 99036 | N3SS | 58025 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58025 to follow |
| 99037 | MACSAT | 58023 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58023 to follow |
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Ok, a SatNogs station beat me to it… CSC-1 appears to be 1k2 BPSK (therefore USB demod).
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By the way there is an interesting pattern in a couple observations of CSC-1 and I think I noticed it on CSC-2 too. An example here:
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Wow - that’s very strange. If it’s coming from the same satellite, it’s like they switched to a different modulation or baud rate mid-pass. Wonder if that was over their home station?
Good 1k2 BPSK decodes here; will have to try CSC-2 another time to see if it’s the same.
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N6RFM was able to confirm that CSC-2 is also decoding as 1k2 BPSK!
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For the gr-satellites users, this the yml file:
name: CSC-1
norad: 99040
data:
&tlm ax25 telemetry:
telemetry: ax25
transmitters:
1k2 BPSK AX.25 G3RUH downlink:
frequency: 401.175e+6
modulation: BPSK
baudrate: 1200
framing: AX.25 G3RUH
data:
- *tlm
When decoding a SatNOGS audio recording from the command line, this is the syntax:
gr_satellites CSC-1.yml --wavfile <audiofile> --samp_rate 48e3 --f_offset 12000
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Hi all,
I can confirm that the CSC satellites use “good ole” AX.25 BPSK with G3RUH scrambling at 1200 baud. (Similar to e.g. SIMBA). They can do 1200, 2400, 4800 and 9600 baud upon command so that is what you have spotted 
Thanks,
Wouter Jan
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Hello Wouter Jan,
Good old Delfi heritage
Thanks for sharing this information, give my best to all the team members in Delft.
Jan
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TLE from space-track.org have been assigned, however we still missing two objects:
0 OBJECT A
1 58016U 23155A 23283.68129292 .00009519 00000-0 10417-2 0 9992
2 58016 97.9302 352.6636 0001166 22.3789 337.8224 14.88020057 237
0 OBJECT B
1 58017U 23155B 23283.68109791 .00006195 00000-0 67744-3 0 9998
2 58017 97.9290 352.6639 0001324 51.1866 309.0107 14.88199378 233
0 OBJECT C
1 58018U 23155C 23283.69884132 .00010074 00000-0 84194-3 0 9998
2 58018 97.6701 352.4892 0005126 348.9423 165.8260 14.98692813 238
0 OBJECT D
1 58019U 23155D 23283.68934884 .00017595 00000-0 14639-2 0 9999
2 58019 97.6679 352.4774 0004343 345.5784 118.1955 14.98735641 234
0 OBJECT E
1 58020U 23155E 23283.70075203 .00017523 00000-0 14527-2 0 9992
2 58020 97.6695 352.4911 0004296 347.6926 178.3456 14.98875729 231
0 OBJECT F
1 58021U 23155F 23283.68897307 .00009730 00000-0 80538-3 0 9994
2 58021 97.6712 352.4794 0002776 12.6058 91.1723 14.99085395 239
0 OBJECT G
1 58022U 23155G 23283.70022899 .00009142 00000-0 75657-3 0 9997
2 58022 97.6695 352.4927 0002848 10.6092 154.0064 14.99110184 236
0 OBJECT H
1 58023U 23155H 23283.69784086 .00017944 00000-0 14580-2 0 9995
2 58023 97.6698 352.4906 0000817 303.8484 210.8628 14.99652416 239
0 OBJECT J
1 58024U 23155J 23283.69959684 .00013255 00000-0 10760-2 0 9991
2 58024 97.6681 352.4928 0000773 251.2569 273.5524 14.99757641 234
0 OBJECT K
1 58025U 23155K 23283.70025799 .00009307 00000-0 75406-3 0 9997
2 58025 97.6697 352.4945 0002435 264.3128 265.0089 14.99924351 230
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Status update:
| Temporary NORAD ID | Satellite | NORAD ID to follow | Other NORAD IDs | Identified | Deployed | Last Update |
|---|---|---|---|---|---|---|
| RECEIVED AND DEMODULATED | ||||||
| 99040 | CSC-1 | 58022 | 58021(unlikely) | NO | YES | Choose to follow 58022, other possible 58021 |
| 99039 | CSC-2 | 58021 | 58022(unlikely) | NO | YES | Choose to follow 58021, other possible 58022 |
| RECEIVED | ||||||
| 99044 | ANSER LEADER | 58019 | 58019(unlikely), 58020(unlikely) | NO | YES | Received but not sure if this is the satellite, maybe it is one of the FOLLOWERS, choose to follow 58019, other possible 58018 and 58020 |
| NOT RECEIVED WITH FREQUENCY | ||||||
| 99045 | ESTCube-2 | 58023 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58023 to follow |
| 99034 | TRITON | 58016 | 58017 | NO | YES | Random Choice to follow between the two (58016,58017) possible: 58016 |
| 99035 | THEOS-2 | 58017 | 58016 | NO | YES | Random Choice to follow between the two (58016,58017) possible: 58017 |
| 99038 | PVCC | 58024 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58024 to follow |
| 99041 | PRETTY | 58024 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58024 to follow |
| 99042 | ANSER FOLLOWER 2 | 58018 | all except from 58016 and 58017 | NO | YES | Reception was probably the ANSER LEADER satellite, FOLLOWERS might not transmitting, Randomly changed to follow 58018 as it is closer to the LEADER |
| 99043 | ANSER FOLLOWER 1 | 58020 | all except from 58016 and 58017 | NO | YES | Reception was probably the ANSER LEADER satellite, FOLLOWERS might not transmitting, Randomly changed to follow 58020 as it is closer to the LEADER |
| NOT RECEIVED WITHOUT FREQUENCY | ||||||
| 99036 | N3SS | 58025 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58025 to follow |
| 99037 | MACSAT | 58023 | all except from 58016 and 58017 | NO | YES | Randomly chosen 58023 to follow |
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I can confirm through our own observations (we’re also happy users of @cgbsat 's strf!) that 58021/58022 match well to the CSC satellites currently.
Best regards,
Wouter Jan
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Detailed analysis of our own observations gives the following ID’s as best matches (in line with observations posted here earlier 
):
CSC-1: 58022
CSC-2: 58021
Best regards,
Wouter Jan
