Author Archives: PE0SAT

CUSAT Telemetry 11-10-2013

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CUSAT Telemetry 11-10-2013 18:04 UTC using Object B
Max elevation 25 degree azimuth between 158 – 025 degrees.

In the beginning of the pass signals where weak but after all 7 frames decoded. Below is one of the latest. Similar to STRaND-1, switching between RHCP and LHCP gives better results.

2013-10-11 18:16:26.400 UTC: [319 Bytes KISS Frame (without CRC)]
ctrl: 3   PID: F0 {UI}   300 Payload Bytes
from BOTTOM to GROUND: 
   1 > 00 00 00 00 01 01 00 20 01 00 00 00 B9 08 03 17 A0 EB 40 00 
  21 > 00 00 00 00 00 00 40 3E 47 3F 11 78 04 10 00 00 00 00 00 00 
  41 > 00 FC 00 79 00 00 00 00 00 00 00 00 00 B4 79 79 79 79 79 79 
  61 > 79 79 00 17 0D 17 00 00 00 07 33 34 00 00 00 00 00 00 00 80 
  81 > 9A E5 40 00 C8 FF FF 01 00 00 00 68 08 02 00 F7 C6 B0 3E E0 
 101 > 39 3C 00 04 00 00 00 01 00 00 00 00 00 00 00 B8 34 98 03 00 
 121 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 141 > 00 00 00 00 00 00 01 01 01 01 01 01 39 3C 00 01 18 05 00 70 
 161 > 0E 00 00 7B 09 ED 4F DA 9F EB 40 58 3C 88 4A 2C 05 8B CA 00 
 181 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 201 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 221 > 00 00 00 FF FF FF 7F 25 31 F8 00 00 00 00 00 00 00 00 00 00 
 241 > 00 00 00 FF FF FF FF 44 00 00 FF 00 00 00 00 00 00 A2 42 BD 
 261 > 97 FF B2 9C 40 B9 C1 AC 1F 00 00 00 66 55 07 60 65 55 07 65 
 281 > 00 36 33 35 32 00 00 00 00 00 00 00 00 00 00 0C 80 00 00 47 
 301 >

The complete kiss file can be downloaded at the following location: CUSAT Data.

One thing that keeps me occupied, and that is the tones that the transmitter of CUSAT is using with AFSK AX25 telemetry. See the picture below and watch the line at the beginning of the burst. It puzzles me.

CUSAT SDR 11-10-2013 18:04UTC

CUSAT Telemetry 10-10-2013

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CUSAT Telemetry 10-10-2013 21:31 UTC
Max elevation 08 degree azimuth 276 – 049 degrees.

After the first pass this evening, where it was impossible to decode some data, this pass was much better. The kiss file can be downloaded at the following location: CUSAT Data.

Here is one of the kiss frames that I received.

[320 Bytes KISS Frame (without CRC)]
ctrl: 3   PID: F0 {UI}   300 Payload Bytes
from BOTTOM to GROUND: 
   1 > 00 00 00 00 01 01 00 20 01 00 00 DC FD 41 86 FB 9F C0 40 00 
  21 > 00 00 00 00 00 00 36 33 3C 34 10 7F 04 0F 00 00 00 00 00 00 
  41 > 00 F6 00 80 00 00 00 00 00 00 00 00 00 12 80 80 80 80 80 80 
  61 > 80 80 36 27 00 00 00 00 00 00 2C 2A 00 00 00 00 00 00 00 80 
  81 > 9A E5 40 00 C8 FF FF 01 00 00 00 68 08 02 00 F7 C6 B0 3E E0 
 101 > 39 3C 00 04 00 00 00 01 00 00 00 00 00 00 00 B8 34 98 03 00 
 121 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 141 > 00 00 00 00 00 00 01 01 01 01 01 01 39 3C 00 08 00 00 00 70 
 161 > 0E 00 00 7B 09 ED 4F DA 9F EB 40 58 3C 88 4A 2C 05 8B CA 00 
 181 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 201 > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
 221 > 00 00 00 FF FF FF 7F E9 30 F2 00 00 00 00 00 00 00 00 00 00 
 241 > 00 00 00 FF FF FF FF 00 00 00 FF 00 00 00 00 00 00 A2 42 BD 
 261 > 97 FF B2 9C 40 B9 B8 AB 1F 00 00 00 66 55 06 55 66 55 07 58 
 281 > 00 36 33 35 32 00 00 00 00 00 00 00 00 00 00 0C 80 00 00 47 
 301 >

Here some SDR data from this pass, where in the second image can see a strange signal just after the burst. I hope this is a locale glitch or another satellite that is using a similar frequency.

CUSAT SDR 10-10-2013 21:31UTC

CUSAT SDR 10-10-2013 21:31UTC

CUSAT and DANDE TLM 10-10-2013

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CUSAT Telemetry 10-10-2013 18:00 UTC (Max elevation 21 degree – Object B)
DANDE Telemetry 10-10-2013 18:04 UTC (Max elevation 22 degree – Object C)

Lets start with DANDE, Object C is still working great and I have good number of frames received and decoded. Download the kiss data at this location.

Looking at CUSAT, I listened to CUSAT for about 4 minutes and made a IQ recording so I could try some analysis after this pass. One thing that was better then before, and that’s the signal strength this evening. So started the AX25 AFSK sound modem and tried to decode some data. This wasn’t working, no data could be decoded by the sound modem from UZ7HO in combination with AWG Kiss Online. After the pass I toke the IQ file and did some further analyses. I tried both MiXW and UZ7HO but couldn’t decode anything. Maybe somebody can give it a try, the IQ file will be available at the following download location: CUSAT Data.

It seems as you can see in this image the signal is strong enough.

CUSAT SDR 10-10-2013 18:00UTC

But one thing that could be making it difficult, and that’s the tones, it seems that they aren’t 1200 and 2200 hertz but slightly of. And another thing that got my attention when playing back the IQ file, is the fact that seems to take an amount of time before the tones are locked at there final frequency.

CUSAT AX25 10-10-2013 18:00 UTC

DANDE Telemetry 09-10-2013

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DANDE Telemetry 09-10-2013 18:00 UTC
Max elevation 19 degree azimuth 148 – 027 degrees

This evening also used Object C 2013-055C and after correcting the frequency ones, it seems the downlink is 436.749 MHz. After that Doppler control toke over and it stayed spot on.

DANDE SDR 09-10-2013 18:00UTC

A total of 37 frames received and they are available at the download location.

DO-64 Telemetry 09-10-2013

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Delfi-C3 Telemetry 09-10-2013 08:39 – 08:50 UTC
Max elevation 18 degree, azimuth 028 – 157 degrees.

Because of a lot of carriers around the telemetry downlink frequency it is normally very difficult for me to decode the data from Delfi-C3. This morning it was going pretty well.
I have recorded the whole pass and as you can hear the satellite had some strange transmissions problems at the begin of the pass.

In total over 150 frames received and passed to the data collection server.

DO64 RASCAL 09-10-2013 08:39UTC

DO64 TLM 09-10-2013 08:39UTC

AENEAS Telemetry 08-10-2013

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AENEAS Telemetry 08-10-2013 19:10 UTC

AENEAS SDR 08-10-2013 19:10UTC

AX25 packet format:

1:Fm KE6YFA-1 To CQ Via TELEM  [21:11:16R]
4341455255531D00400200081D0B0117090037050000001000F075000070130049C062D941C74E

Decoder format:

AENEAS Beacon Data Decoder, Rev 1.1
Opening file at TLM_08-10-2013_1910UTC.txt
AENEAS Beacon TLM Packet found:
---------TELEMETRY-BEGIN----------
Total length: 29
Type:64
Unused: 0x02 0x00 
Time: 8/29/11-1-23:9:0
Reboots: 1335
Last Reboot Cause: 0
Flash Status: 0
Bit 0 = 0 : Device is ready.
Bit 1 = 0 : Device is NOT write-enabled.
Bit3&4= 1 : All sectors software-protected.
Bit 4 = 0 : WP is asserted.
Bit 5 = 0 : Last op successful.
Bit 7 = 0 : Sector Protection Registers unlocked.
Payload Write Pointer: 1273856
Telemetry Pointer: 7729152
Radio Status: 73
No detailed Radio info yet
Misc Write Pointer: 1104765632
---------TELEMETRY-END----------