As part of the experiment. At the beginning, it is transmitted as usual, with the transmission header received, and on the next turn, according to a pre-set schedule, the transmission begins earlier, 6 minutes before entering the MCC visibility zone. Well, since the header has already been received, then we get the missing part of the packets from this transmission. All this sounds like a perversion, of course, but what else can you do when the capabilities for transmitting massive data are limited?! The transmitter from the range is not in service.
2 Likes
On Friday, June 20, SSTV (Robot 36) activation is planned. Only a “dummy” will be transmitted.
The interval and format may change during the transmission.
~16:55 UTC until ~ 20:10 UTC
437.625 MHz
telegram: onthe_air
2 Likes
I’d like to decode the transmitted image, but I don’t have the raw data in wav form or at least in kiss (kss) or some csv
I’ve been trying to compose one image from observations uploaded to satnogs. I got many small chunks, some of it is a jpg header, but i’m just not able to make it a complete picture.
Umka-1 is using ax.25 messages for the transmission. Skipping the container part of that and focusing on the payload i figure that a file fragments has the form of:
240C 0f000100c00001 00000000 FFD8FFE000104A4649460001
the first two bytes is the message type - i.e. file fragment in our case -, the next 7 bytes seem to be always the same for this type, then comes 4 bytes for the file offset and the rest 200 bytes is the actual contents of the fragment.
So i downloaded a bunch of observations between 2025-06-07 and 2025-06-09 and tried to make a picture out of it but no luck so far.
@ra3ppy or someone else, do you have the raw data I could try to process?
Also I’m interested in the 0f000100c00001 part, what is the role of that one?
Thanks
1 Like
Hello. I apologize for not being able to answer you in time. But I’m glad you managed to do it yourself.
1 Like
Broadcast of children’s drawings from the UMKA-1 cubesat will begin on June 27 at 11:34 UTC.
Broadcast will end on July 1 at 23:55 UTC.
A break in the broadcast is planned from June 29 at 19:14 UTC to June 30 at 23:55 UTC
16 children’s drawings have been prepared for broadcast.
12 from Russia, 2 from Slovenia and 2 from Myanmar (Burma).
SSTV Robot36 format
Frequency - 437.625 MHz
Intervals - 130 sec
6 Likes
Yes. it has been a good project. I’m, still interested in those magic bytes though.
0f000100c00001
Do you have a publicly available package format somewhere, or is that private information?
- 2025-06-27 11:17UTC
- 2025-06-27 11:19UTC
- 2025-06-27 11:21UTC
UmKA-1 over Brazil 
!! (The event started a little earlier than scheduled)
2 Likes
Nothing heard except telemetry on a 40° pass over Norway.
Jomjom79
1 Like
Same here.
2 Likes
- 2025-06-29 00:19UTC
- 2025-06-29 00:21UTC
- 2025-06-29 00:23UTC
- 2025-06-29 00:25UTC
UmKA-1 over Brazil !!
3 Likes
