TUBIN/TUBSAT-27 Re-Entry

Satellites & Observations
41

trying decode using gr_satellites and get this data:

Summary 
-> Packet from 4k8 FSK downlink
Container: 
    control = Container: 
        message_type = (enum) regular 1
        num_blocks = 31
        address = (enum) gs 0
        sub_address = (enum) broadcast 3
        ack = False
        baud = (enum) baud_4k8 0
    callsign = u'DP0TBN' (total 6)
    callsign_crc = 0x15C0
    transfer_frame = b'\x14\x99(}\x00\x11\x110\xc6\x0e\x1a\x05N\x00\x0fL,$&"\xb1\x1f"<`(\x9a\x88\xaf\xfb\x12\xd8(\x00\x8bh\x04\xceO\xdd1V\xdc\x8c\xbe\rI\x87\xb3\xddR\t\x0c\x97\xcc\xe0{\x05eD!\x12\x0bs\xad\xf1\xbb\x8f\xc2.\x1f\'I\\A\xac\x82\x19\x10\x0b\xf5\xf3\x9b\x00\xd7;\x19\xf3\xdf\xc5\xed\xd6\xa9\xed\x1b\xban@a\xb9f(5hw\x05\xac\x00\x8b\xccZ\xd3\x90K\x00j:\xcfj\x0b\xac24J.6\x95\x91F\x10\xce\x19Z\x8b\x93\x97\xcc\xdd\xd0\xfc\xb7py\xd8\xc6\xa3\xf3\x9feb\xfd\xf2b,\xcaO\x8e\xd5V\x90\x19\xa1\xec\xf6\x14\x87\x19\xab\xf9\x03\x90\xb5L&\x1a\xfdJmh\xa8%\xe2b\xdd\xe9Fr\xd1\xc7\xa6\xda\xe7\x0c\x02\xb3\x0b9\x92\xa0\x96\x9b\xc8Y\x921=H$&\xee\x809\xac\xc6$s\xd7c\x9a\xa7V\xb4\x83F\x8ep\xfd\r\xef\x1ao\xdfL&\xdb\xd7\x1f\'\x13\xbf\x9a\x9c\x88\xa0\x9da\x16&\xdc\x16\xd0\x0c\xcc,bi[t\xc4\xfa\xac\x11\xc5\'\xa5ZG\xc4p\xbe\x9a\xd0\x94\x9a\xa6\xc8hPd\x7f\x8e&rC\x1d\x97\xbf*\x1c\xba\xb3\xbe\x9e\xfc\n\xe6\x8e\x04\xc9\xc6`\xb1e\x1a\xd4\'\xc3@\x89\xdcv\xe0\x97\xd9,!^XL\xe7\xa92.!\xc5\xca\xa6\xc6,\x9a\xdcVDj\xb9:9\xb6\xa9\xfc\x02\xcd \xe2]B\x16\x83\xa02\x9do\xcf5T\xcd\x90v"|hZ\x0c\xe0\x9b\xb2\xe0\xa2@\xb4\x1e$q\x9e\x81\xa4\xeb\xe5\xa2\xbd\xae\x1dj\x9e\xb3\xcanFm\x0c\xc0*\xbc_\xfd\x08\xa5\xc9\xad*\x82E\xc1\xf8N\xef"\x03n!\xf7\xde\x1eZ+\x8d\x14\x89\x84\xeeWJ\xc1\x05Xh\xa11J\x16\x04i\x07\x85\xac\xfc\xbc\xee\x80\x11\x85\xa932I\x8e\x0c\x0f\xf5\xa6h\xafI@\xf6V\x81v\x97\xfd?\xb4\xd6\x18B\xce\xa0\xd0\xb2{f\x8d\xcf=\x06Bc\xa6\x00\xe9Y\xd4e\xf9\x80U\noI\x19\xba\x01H\xec\x817\\\xdac\xd4\x1c\x06"\xbb\xe96\xf4\xcf1\xd4\xffp\xf7\x82\x19k&&]\x9fy\xbd\x04Q\x18\x8e|\xe2+\'\xb5`s8\x06\xdev\xe8\xd4\x17\xa0\x93@-;\x97\x1d\xb4\xcc\x85\xfe\x8bFj\xb50\xc7\x15\xa3\xec\x05Bn5tl\xebdY\x83F\xb6\xc6\xa7\xc8L' (total 576)
    reserved0 = b'\xaa' (total 1)
    error_marker = b'\xff\xff\xff\xff' (total 4)
    reserved1 = b'\xbb' (total 1)

any script to translate this data into telemetry, or maybe online dashboard?

42

Sorry for the late reply. Awesome that you were able to decode so many frames. We have a document the describes the telemetry format and source packets, but it is outdated as a lot of source packets now have a newer version:
TechnoSat_TUBIN_Telemetry_Format.ods

@kerel also asked about something similar recently and a colleague created the following document, a bit different format:
TUBiX20_Telemetry_Format.zip (78.4 KB)

You should be able to get all needed information out of it, but I know it is not very convenient. I would love to have a kaitai, then we could also decode the telemetry in SatNOGS DB directly, but no one had time for that yet. Maybe after the re-entry? I think @kerel wrote a small script to handle that, maybe he is open to share it?

2 Likes
43

I updated the first message in this thread with additional information about:

  • Current re-entry prediction by GSSAC: 2025-12-16 10:09:02 (UTC) ± 30 h
  • Modulation and decoders
  • Framing of telemetry
  • How we will distribute our TLEs
  • SiDS server
  • QSL cards
5 Likes
45

2025-12-11T17:58z - Just one frame decoded and uploaded to both SatNOGS and TU-Berlin databases, at 7.9° max el. in Greece.

Screen capture 1
Screen capture 11920×1041 669 KB

5 Likes
46

2025-12-12 05:2x UTC
23 packets fully decoded at max. 27° el. at 237 km.
The other half decoded only partially due to fading.
Upped to SatNOGS and TU-Berlin.

7 Likes
47

2025-12-12T17:44z rx in Greece.

Screen capture
Screen capture1920×1040 664 KB

3 Likes
48

Updated TLE based on space-track.org latest TLE and Network observations:

TUBIN
1 48900U 21059X   25348.36622942  .00000000  00000-0  80389-3 0    08
2 48900  97.6632 177.1517 0005024 268.7256  18.2698 16.27508467    02

tubin_348_v1.dat (1.4 KB)
sites.txt (11.9 KB)

2 Likes
49

A little more accurate calculated TLE:

TUBIN
1 48900U 21059X   25348.36622943  .00000000  00000-0  83013-3 0    06
2 48900  97.6632 177.1676 0005024 122.6586 164.3852 16.27229293    04
3 Likes
50

TLE update:

TUBIN
1 48900U 21059X   25348.56908512  .00000000  00000-0  69822-3 0    09
2 48900  97.6632 177.4656 0005024 122.6586 272.6431 16.29025490    06

sites.txt (11.9 KB)
tubin_348_v4.dat (1.9 KB)

There is also a new TLE from space-track.org but it has started to deviate.

2 Likes
51

2025-12-14T17:03z rx in Greece with manual Doppler correction.

Screen capture
Screen capture1920×1040 672 KB

6 Likes
52

Please, is there a way to download the right Soundmodem for Technosat 4800bd here? I can’t find it online….

53

Here the link for the HS Soundmodem TechnoSat 4800

image
image752×339 40.4 KB

This seems to be an older version, if someone has a more recent please share this release.

Jan | PE0SAT

3 Likes
54

One more TLE update:

TUBIN
1 48900U 21059X   25348.70806518  .00000000  00000-0  69845-3 0    03
2 48900  97.6632 177.6677 0005024 122.6586   6.9388 16.29422271    08

tubin_348_v5.dat (2.1 KB)
sites.txt (12.0 KB)

4 Likes
55

Hey Jan,

Thank you so much :slight_smile:

1 Like
56

Worked perfect, according to our calculations the offset to GPS was 0.3 seconds, many thanks :slight_smile:

1 Like
57

So sad to say. It was a perfect pass over JN48 but the Soundmodem (Technosat 4800bd) didn’t encode a byte here. Once i got a “undecoded blocks” messge from Soundmodem and that was all. There must be something wrong in my setup here.

58

Did you create and IQ file so we can try again?

Jan | PE0SAT

59

Hi Jan,

gladly i have the complete pass in the baseband recorded. And after a restart of the soundmodem, i could decode the blocks without errors.

Also i get the blocks in GetKISS

grafik
grafik745×466 19.2 KB

but i am not sure, if the TU received my sended blocks, because i didn’t receive a HTTP OK

grafik
grafik756×469 11.1 KB

2 Likes
60

http://uz7.ho.ua/modem_beta/other-versions.zip

1 Like
61

2025-12-14 18:2x UTC
21 fully decoded packets uploaded to SatNOGS and TU-Berlin.

2 Likes