RoseyCubesat-1 Image Decoding - last beacon(s) before decay

dl7ndr · August 26, 2024, 5:40pm

Schedule for next transmission: 2024-08-27 (Tuesday) 10:06 UTC (again).

dl7ndr · August 26, 2024, 6:11pm

The closest to 10:14:36 I found is

2024-08-26 10:14:24|A49EA68AB262E0A49EA68AB2626303F03101FFFF556E652045636F6C6520706F7572206C61205669650000000000000000008C55CC6600000000A00003CA000000|10107952|Drachten-JO33bc

A000 marks the temperature as a 2 bit signed integer in little endian according to the decoder. It means you have to read the hexadecimal number as 00 A0 which is as a decimal number 160.

Inspecting the temperature panel on RoseyCubesat-1’s dashboard it reveals in line 66:

“query”: "SELECT last("temperature")/100 …

So you have to divide 160 by 100 and that’s 1.6.
The unit of the temperature panel is °C, therefore it’s 1.6 °C.

jomjom79 · August 26, 2024, 6:23pm

Thank you. Yeah that is a bit more sensible. I thought it was a result of atmospheric drag but i guess its not that low just yet.

Jomjom79

HS318 · August 26, 2024, 7:41pm

I think that will be getting hotter soon with its rate of decay

tomasz · August 26, 2024, 11:17pm

I’ve compiled some observations into one photo.

roseycubesat ostatni

HS318 · August 27, 2024, 5:04am

Would love to know how that was done, I presume you compiled the hex data into one file and then converted it into the image.

tomasz · August 27, 2024, 6:46am

This is more straightforward. I’m not that good
I simply downloaded all the observations as audio files and played them by vlc.
I fed the signal from VLC to the soundmodem via virtual cables and started the decoder.
Fortunately, the packets are numbered and each packet, when it appeared- appeared in its appropriate place in the picture slowly filling it up.