Telemetry decoding

This evening we did some telemetry decoding.

April 1, 2013 17:50 UTC

First CubeSat we gave a try was STRaND-1, but it wasn’t sending any data this evening (April 1, 2013 17:50 UTC). When I looked at the Satblog from DK3WN it seems that STRaND-1 wasn’t heard the whole day. Lets hope noting is wrong with the CubeSat.

April 1, 2013 18:05 UTC

RAX-2 is sending telemetry loud and clear, and the combination FUNcube Dongle Pro+, Orbitron and SDR# are doing a great job in controlling Doppler thanks to a great Doppler control plugin that can be part of SDR#.

RAX-2 SDRSharp

RAX-2 is sending every 20s a 9k6 data burst that can be decoded with the decode software from Mike DK3WN. During this pass I received over 60 packets and in the below image you can see the results.

RAX-2 TLM 01-04-2013 18:05 UTC

Here is an example of a KISS frame that is received from RAX-2, nice to see the error that RAX-2 is using RAX-1 as Call.

[254 Bytes KISS Frame (without CRC)]
ctrl: 3   PID: F0 {UI}   235 Payload Bytes
from RAX-1 to CQ: 
   1 > AB CD 00 00 06 00 03 EB 00 6E 76 33 CB 59 51 58 CB 59 51 00 
  21 > 00 00 00 90 00 FF FF 31 05 99 00 95 09 16 00 03 00 4C 00 9E 
  41 > 00 15 00 29 00 00 00 19 00 00 00 80 00 77 02 6E 07 02 00 FF 
  61 > FF 08 00 00 00 CD 00 6E 07 41 07 00 00 00 00 35 00 93 00 11 
  81 > 00 3C 01 33 93 E7 C2 05 00 00 00 00 00 D5 39 00 00 00 00 BD 
 101 > FF 47 00 84 FE 10 00 13 00 A9 00 58 00 00 00 00 00 25 00 E1 
 121 > FF 15 00 AE FE 04 01 75 04 B4 08 F0 0A AF 02 90 05 0C 00 00 
 141 > 00 08 00 5B 06 02 00 00 00 07 00 EF 05 01 0E 7E 07 83 08 2E 
 161 > 06 91 02 AF 01 D1 02 36 06 00 00 C6 09 25 00 84 06 83 38 FF 
 181 > FF FF C7 0F D2 12 5A 59 59 5C 5C 5C 5B 9B CE 42 00 00 9F 51 
 201 > FF 44 66 FF 9E 5B CE C8 C8 3F A0 00 00 00 41 9F 00 00 00 FF 
 221 > FF FF D2 07 18 FF FF FF FF 4F 08 5E F1 68 DD

April 1, 2013 19:02 UTC

MASAT-1 sends a two tone signal

MASAT-1 Audio Spectrum

This signal can be decoded with the telemetry software that is available on MASAT-1 website. After that you can use the log file with a decoder program from DK3WN and this produces the following output.

MASAT-1 TLM 01-04-2013 19:02 UTC

Here is an example of the data that is send by MASAT-1

PACKET 03 EC 03 19 6C 20 CE 00 AE 55 00 00 42 55 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c71bc513453b2f0810625751f5236f4df7a11078 1364842925809

When you want to experiment with receiving telemetry, take a look at my soundcard page and give it a try.

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