ISRO PSLV-C54/EOS-06 Mission - 2022-11-26 06:26 UTC

Satellites & Observations Launches
21

It looks like that both Thybolts are alive in CW frequency, however they are ~5-10KHz off.

https://network.satnogs.org/observations/6796187/

EDIT: Here is a better waterfall SatNOGS Network - Observation 6796220

EDIT2: Nothing heard on FSK frequency

1 Like
22

Drift for CW transmitters has been added:

Randomly chosen:
-5.7 KHz for Thybolt 1
-8 KHz for Thybolt 2

Scheduled observations in Network have been updated accordingly!

3 Likes
23

Thank you, @fredy. I saw your observations. FSK Telemetry is only active over India AFAIK.

2 Likes
25

Based on the TLE shared and temporary NoradID’s in the SatNOGS db I created the following preliminary TLE.

INS-2B
1 99288U          22330.34726505 -.00000000  00000-0 -00000-0 0 01116
2 99288  97.5631  65.2609 0010969 257.1226 307.6549 15.18801812111111
THYBOLT-2
1 99289U          22330.34726505 -.00000000  00000-0 -00000-0 0 01117
2 99289  97.5631  65.2609 0010969 257.1226 307.6549 15.18801812111112
THYBOLT-1
1 99290U          22330.34726505 -.00000000  00000-0 -00000-0 0 01119
2 99290  97.5631  65.2609 0010919 257.3986 307.3787 15.18818263111113
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26

Both Thybolt-1 and Thybolt-2 have been received.

1 Like
27

And a good match on the preliminary TLE

image
image796×632 7.28 KB

5 Likes
28

New TLE set in TBA status from space-track.org:

0 TBA - TO BE ASSIGNED
1 54361U 22158A   22330.54007610 -.00000043  00000-0  00000+0 0  9997
2 54361  98.3532  65.3310 0010752 232.2473 249.1355 14.45854148    33
0 TBA - TO BE ASSIGNED
1 54362U 22158B   22330.46716434 -.00000068  00000-0  00000+0 0  9997
2 54362  97.4620  65.8199 0021619 250.9105 248.1914 15.16622961    18
0 TBA - TO BE ASSIGNED
1 54363U 22158C   22330.53211888 -.00000068  00000-0  00000+0 0  9999
2 54363  97.4250  65.7777 0016051 242.8135 252.3438 15.18483425    27
0 TBA - TO BE ASSIGNED
1 54364U 22158D   22330.53159181 -.00000068  00000-0  00000+0 0  9997
2 54364  97.4394  65.7463 0009820 258.0579 234.3284 15.18922767    22
0 TBA - TO BE ASSIGNED
1 54365U 22158E   22330.53148774 -.00000069  00000-0  00000+0 0  9995
2 54365  97.4293  65.7560 0020815 231.6815 260.4317 15.18830380    22
0 TBA - TO BE ASSIGNED
1 54366U 22158F   22330.53127238 -.00000069  00000-0  00000+0 0  9998
2 54366  97.4589  65.7283 0011737 249.0791 242.0276 15.19791103    22
0 TBA - TO BE ASSIGNED
1 54367U 22158G   22330.53189645 -.00000069  00000-0  00000+0 0  9999
2 54367  97.3925  65.8279 0018247 241.5061 253.1743 15.19923954    14
0 TBA - TO BE ASSIGNED
1 54368U 22158H   22330.53271213 -.00000080  00000-0  00000+0 0  9996
2 54368  97.4452  65.7464 0040566 272.9426 226.4454 15.27934667    23

Several are close to our observations for Thybolts so I’ve chosen the following to follow for now:

Thybolt-1 54364
Thybolt-2 54365
INS-2B 54366

29

Using the result of @PE0SAT analysis:

image
image814×617 7.15 KB

I’ve changed Thybolts to:

Thybolt-1 54363
Thybolt-2 54364

1 Like
30

@fredy, since FSK telemetry is only active over India does it make sense to set the 436.175 MHz - Data and telemetry transmitter to inactive?

31

If it is active then let’s keep it as it is. We just need to schedule observations only above India for the FSK. cc @ENSFNM as it seems that scheduled a lot of observations with FSK.

By the way from the latest published TLE by space-track.org for this launch:

0 OBJECT A
1 54361U 22158A   22332.80050388 -.00000043  00000-0  00000+0 0  9998
2 54361  98.3536  67.5569 0011053 222.5849 137.4479 14.45831397   364
0 OBJECT B
1 54362U 22158B   22332.83721204 -.00000068  00000-0  00000+0 0  9991
2 54362  97.4614  68.1551 0022642 240.0506 231.3845 15.16678270   371
0 OBJECT C
1 54363U 22158C   22333.15098119 -.00000068  00000-0  00000+0 0  9990
2 54363  97.4472  68.3231 0010194 257.5293 150.0626 15.19076005   427
0 OBJECT D
1 54364U 22158D   22332.77539015 -.00000068  00000-0  00000+0 0  9993
2 54364  97.4503  67.9487 0010124 253.0646 261.9078 15.19079941   365
0 OBJECT E
1 54365U 22158E   22332.77518431 -.00000068  00000-0  00000+0 0  9993
2 54365  97.4446  67.9442 0010704 259.7824 256.2099 15.19322959   368
0 OBJECT F
1 54366U 22158F   22333.14969117 -.00000068  00000-0  00000+0 0  9997
2 54366  97.4421  68.3113 0009420 260.0174 145.3504 15.19552246   428
0 OBJECT G
1 54367U 22158G   22332.69893324 -.00000068  00000-0  00000+0 0  9993
2 54367  97.4459  67.8792 0007456 259.5868 205.2296 15.19988175   346
0 OBJECT H
1 54368U 22158H   22333.21182008 -.00000069  00000-0  00000+0 0  9994
2 54368  97.4493  68.3888 0007539 268.3451 122.0935 15.20078951   435
0 TBA - TO BE ASSIGNED
1 54369U 22158J   22332.83849855 -.00000069  00000-0  00000+0 0  9992
2 54369  97.4476  68.0191 0007452 274.9326 234.9922 15.20200718   379
0 TBA - TO BE ASSIGNED
1 54370U 22158K   22333.21039666 -.00000069  00000-0  00000+0 0  9998
2 54370  97.4494  68.3872 0007946 278.2432 107.2683 15.20355707   435

Thybolts fit 54363 and 54364, we will need some more separation to identify which Thybolt is which.

32

Sounds good wrt FSK transmitter. Agree that 54363 and 54364 fit Thybolt well and I believe the Dhruva Space team is also using the same.

33 
THYBOLT 1               
1 54363U 22158C   22334.75121328  .00009999  00000+0  47834-3 0  9996
2 54363  97.4491  69.9002 0010504 244.8689 268.5744 15.19133779   668
THYBOLT 2               
1 54364U 22158D   22334.75115478  .00010141  00000+0  48490-3 0  9996
2 54364  97.4499  69.8986 0010567 242.9993 270.2786 15.19144054   667

Celestrak TLE for both satellites.

34

Thanks for the TLE @deepak26, these are the objects we follow in DB and Network for Thybolts. For identification maybe we will need some more time to make sure which Thybolt is which object. If you already have data for the identification please share it.

By the way as informed by @deepak26 the FSK transmission is now on for testing globally, so I’ve scheduled a couple of observations for the next 48h.

1 Like
35

Also we have added a new transmitter (uncoordinated one) for INS-2B which probably is OBJECT E(54365).

2 Likes
36

Sharing the mission link

https://www.dhruvaspace.com/dhruva-space-thybolt-mission-ham-radio-operators

Please report the receptions in the form on the mission webpage for the QSL Card.

Thank You
73Deepak

37

The INS-2B signal on 435.080 is weak and difficult to get enough SNR, for now I am trying to decode the signal similar to INS-2TD FSK 1200 AX.25.

If there is more information available, then please share it.

Regarding the APRS on 145.850, is there already some scheduling known?

1 Like
38

Identifications of the three satellites:

Satellite Id Satellite Identified NORAD ID Link to Identification Evidence
WQPT-3457-5126-1772-6682 THYBOLT-1 54363 Ikhnos Identification of Thybolt-1 : SatNOGS Community : Free Download, Borrow, and Streaming : Internet Archive
FBWZ-9594-5872-5644-3969 THYBOLT-2 54364 Ikhnos Identification of Thybolt-2 : SatNOGS Community : Free Download, Borrow, and Streaming : Internet Archive
EFIC-2341-1789-8177-9840 INS-2B 54365 Ikhnos Identification of INS-2B : SatNOGS Community : Free Download, Borrow, and Streaming : Internet Archive
3 Likes
39

Hello! @fredy @PE0SAT @vu2lbw @vu2cwp @DK3WN
We have uploaded our gr_thybolt decoder to GitHub and also an online decoder on our mission webpage.
You can book maximum passes for thybolt_1 and upload your observations and TLM to the webpage

Link to gr-thybolt : GitHub - thybolt4hams/gr-thybolt
Link to online decoder software : thyboltmission.web.app
Dhruva Space | Thybolt Mission for HAMS

ThankYou
73Deepak

2 Likes
40
41

Thank you very much for this information,

I immediately wanted to give it try but ran into a problem, please have a look at this issue.