ISS Deployment (JAXA) J-SSOD#35 - 2026-02-03 08:20 UTC

K4KDR · February 6, 2026, 2:05am

Great job, Bob!

I see the same distortion in your packet in the lower-freq section… perhaps the transmitter is injecting some trash making these frames more difficult to decode.

fredy · February 6, 2026, 9:21am

Based on this and given that 1KUNS was MSK AX100 Mode 5, I’ve changed the transmitter to that mode in DB for GXIBA-1.

PY4ZBZ · February 6, 2026, 12:06pm

Hi Bob,

Yes ! WideFM demod and 1KUNS Ver 0.05b is OK !

73 de Roland PY4ZBZ

PY4ZBZ · February 6, 2026, 9:55pm

PY4ZBZ · February 6, 2026, 9:56pm

CoRAL @ 1k2

fredy · February 7, 2026, 9:36am

There are now published TLE from space-track.org:

0 TBA - TO BE ASSIGNED
1 67683U 98067XZ  26036.75905287  .00053171  00000-0  95375-3 0  9999
2 67683  51.6310 230.1884 0007776  59.1422 301.0331 15.49358087   364
0 TBA - TO BE ASSIGNED
1 67684U 98067YA  26037.92001410  .00052577  00000-0  93977-3 0  9990
2 67684  51.6314 224.4401 0007746  62.2205 297.9568 15.49464211   543
0 TBA - TO BE ASSIGNED
1 67685U 98067YB  26037.92012590  .00047751  00000-0  85682-3 0  9994
2 67685  51.6312 224.4405 0007864  62.7877 297.3912 15.49395303   549
0 TBA - TO BE ASSIGNED
1 67686U 98067YC  26037.79119683  .00040563  00000-0  73065-3 0  9997
2 67686  51.6307 225.0797 0011170  87.3207 272.9060 15.49324988   533
0 TBA - TO BE ASSIGNED
1 67687U 98067YD  26037.79107111  .00047022  00000-0  84186-3 0  9994
2 67687  51.6309 225.0790 0013087  82.8856 277.3620 15.49405872   531
0 TBA - TO BE ASSIGNED
1 67688U 98067YE  26037.79069587  .00076414  00000-0  13455-2 0  9996
2 67688  51.6308 225.0770 0013184  83.4359 276.8130 15.49665429   538

We are going to wait to be assigned in order to complete the identification process

fredy · February 7, 2026, 11:23am

Status update:

Temporary NORAD ID	Satellite	NORAD ID to follow	Other candidate NORAD IDs	Identified	Deployed	Reception	Last Update
RECEIVED & DEMODULATED/DECODED
98531	GXIBA-1	67688	-	NO	YES	Received	Received, changed to follow 67688
98397	LEOPARD	67685	67683(unlikely), 67684(unlikely), 67686, 67687(unlikely)	NO	YES	Received	Received, changed to follow 67685, other possible 67683(unlikely), 67684(unlikely), 67686, 67687(unlikely)
98396	CoRAL	67687	67683, 67684, 67685(unlikely), 67686(unlikely)	NO	YES	Received	Received, changed to follow 67687, other possible 67683, 67684, 67685(unlikely), 67686(unlikely)
UNKNOWN STATUS
98532	KNACKSAT-2	67686	67683, 67684, 67685, 67687, 67688(unlikely)	NO	YES	-	Randomly chosen to follow 67686 , other possible 67683, 67684, 67685, 67687, 67688(unlikely)
98398	UiTMSAT-2	67683	67684, 67685, 67686, 67687, 67688(unlikely)	NO	YES	-	Randomly chosen to follow 67683, other possible 67684, 67685, 67686, 67687, 67688(unlikely)
IN DB WITHOUT FREQUENCIES
98403	HMU-SAT2	67684	67683, 67685, 67686, 67687, 67688(unlikely)	NO	YES	-	Randomly chosen to follow 67684, other possible 67683, 67685, 67686, 67687, 67688(unlikely)

Note: we will waiting for TLE sets to be assigned before moving to identification

dl7ndr · February 7, 2026, 1:58pm

LEOPARD
2026-02-07 12:2x UTC

PE0SAT · February 7, 2026, 6:16pm

GXIBA-1 TLE Update, matching object 67684

Jan | PE0SAT

fredy · February 8, 2026, 12:14pm

It looks like with the assigned TLE there are some changes:

0 OBJECT A
1 67683U 98067XZ  26038.95218879  .00039054  00000-0  70158-3 0  9993
2 67683  51.6309 219.3314 0011067  90.8289 269.3968 15.49420824   170
0 OBJECT B
1 67684U 98067YA  26038.95140831  .00067604  00000-0  11857-2 0  9998
2 67684  51.6310 219.3274 0013081  86.5899 273.6586 15.49832053   170
0 OBJECT C
1 67685U 98067YB  26038.95200220  .00041806  00000-0  74726-3 0  9999
2 67685  51.6310 219.3305 0013033  86.1189 274.1289 15.49505859   178
0 OBJECT D
1 67686U 98067YC  26038.95190626  .00049570  00000-0  88311-3 0  9999
2 67686  51.6318 219.3303 0007830  64.5280 295.6518 15.49582531   170
0 OBJECT E
1 67687U 98067YD  26039.08106976  .00039685  00000-0  71187-3 0  9999
2 67687  51.6314 218.6929 0007899  65.9594 294.2221 15.49487261   115
0 OBJECT F
1 67688U 98067YE  26038.95191701  .00042387  00000-0  75762-3 0  9991
2 67688  51.6318 219.3305 0007805  65.3010 294.8790 15.49559502    92

This is one of these changes!

fredy · February 8, 2026, 12:54pm

As noted in the previous post it seems there were some swaps, so here is the latest status update:

Temporary NORAD ID	Satellite	NORAD ID to follow	Other candidate NORAD IDs	Identified	Deployed	Reception	Last Update
RECEIVED & DEMODULATED/DECODED
98531	GXIBA-1	67684	-	NO	YES	Received	Received, changed to follow 67684
98397	LEOPARD	67687	67685(unlikely)	NO	YES	Received	Received, changed to follow 67687, other possible 67685(unlikely)
98396	CoRAL	67685	67686(unlikely), 67687(unlikely), 67688(unlikely)	NO	YES	Received	Received, changed to follow 67685, other possible 67686(unlikely), 67687(unlikely), 67688(unlikely)
UNKNOWN STATUS
98532	KNACKSAT-2	67683	67684(unlikely), 67685, 67686, 67687, 67688	NO	YES	-	Randomly chosen to follow 67683 , other possible 67684(unlikely), 67685, 67686, 67687, 67688
98398	UiTMSAT-2	67686	67683, 67684(unlikely), 67685, 67687, 67688	NO	YES	-	Randomly chosen to follow 67686, other possible 67683, 67684(unlikely), 67685, 67687, 67688
IN DB WITHOUT FREQUENCIES
98403	HMU-SAT2	67688	67683, 67484(unlikely), 67685, 67686, 67687	NO	YES	-	Randomly chosen to follow 67688, other possible 67683, 67484(unlikely), 67685, 67686, 67687

Due to these swaps and due to the satellites still be close to each other, I think we should wait a couple of days before finalizing the identification, just to be sure that nothing will change.

emone · February 9, 2026, 4:23am

Dear @dl7ndr and @K4KDR

I just made a first draft decoder of KNACKSAT-2 following the MR link below. However, TM beacon data segments may be uncertain. and need more samples for reverse engineering, or should get the technical specifications from KS2 team.

librespacefoundation/satnogs/satnogs-decoders!501

Regards

Anol P.

dl7ndr · February 9, 2026, 6:09am

Hi Anol,

Thank you very much for your work.

You need to list all IDs you want to access later via dashboard below :field csp: ax25_frame.payload.ax25Info.csp.

value: (src_ssid_raw & 0x0f) >> 1 should be value: (src_ssid_raw & 0x1f) >> 1 (with 0x1f) to catch SSIDs higher than 7 (or so).

All I have (from Apiwat) regarding the telemetry is the following file:
main.c.txt (8.5 KB)

73
Daniel

emone · February 9, 2026, 9:43am

Hi Daniel,

Thank you for your support.

I will quickly review and update it to close the KS2 dashboard. and let you know asap.

BR

Anol

emone · February 9, 2026, 5:53pm

Hi @dl7ndr @K4KDR

I updated knacksat2.ksy decoder structure following the main.c.txt file
Could you review librespacefoundation/satnogs/satnogs-decoders!501, please?

BR
Anol

dl7ndr · February 9, 2026, 8:10pm

Hi Anol,

Looks good.
Now we need some packets to test the decoder.

Daniel

dl7ndr · February 9, 2026, 8:14pm

LEOPARD: QSL cards

X: leopard_cubesat

K4KDR · February 10, 2026, 1:45am

Along with everyone else, I would love to see some downlink packets.

The old URL to the pre-deployment test files is prompting me for permission, so instead I have placed the sample audio file at the following URL if anyone would like to use it for any testing:

https://www.dropbox.com/scl/fi/8v6hocfdwayg99d1kg8mv/gqrx_20260202_032935_400630000_KS-2_AUDIO.wav?rlkey=atvuisd8gx20ho72rjzerdzlo&dl=0

dl7ndr · February 10, 2026, 6:19am

Tested on https://ide.kaitai.io with knacksat.hex.txt (165 Bytes) using knacksat.ksy.txt (8.2 KB) (remove .txt).

Looks impressive.

K4KDR · February 10, 2026, 8:26am

Excellent!

One thing I’ve always liked about the Kaitai site is that when you click on a telemetry item, it highlights the bytes that deliver that value. Really illustrates the role that the hex bytes perform in all these downlink packets.