follow me on twitter ...RS-22
Wednesday, August 25th, 2010 by DK3WN in RS-22 | No Comments → 19:39 UTC DOKA telemetry system data transmission
e.g. analyzing byte #110 of each frame
RS-22
Sunday, August 15th, 2010 by DK3WN in RS-22 | No Comments → 20:02 UTC – 20:06 UTC DOKA data transmission on 435.352 MHz (608 bit frames size)
20:06 UTC – 20:15 UTC (LOS) no CW beacon signal
RS-22
Thursday, July 29th, 2010 by DK3WN in RS-22 | No Comments → 19:30 UTC only some DOKA transmission, no CW beacon
DOKA transmission system – 256 frames per block, 608 bits per frame
8 byte sync sequence (58 E9 3B 4D D6 7A 8F 90) + 1 byte frame counter (00 .. FF)
RS-22
Thursday, July 22nd, 2010 by DK3WN in RS-22 | No Comments → 06:40 UTC DOKA transmission, RS-22 seems to be spin very fast (lost of stabilisation?)
rapid changes of field strength
RS-22
Tuesday, May 25th, 2010 by DK3WN in RS-22 | No Comments → 18:58 UTC nothing heard
RS-22, TATIANA-2
Monday, May 17th, 2010 by DK3WN in RS-22, TATIANA-2 | No Comments → 20:35 UTC nothing heard from both satellites 
RS-22
Thursday, May 13th, 2010 by DK3WN in RS-22 | No Comments → 21:20 UTC nothing heard from RS-22
RS-22
Sunday, April 25th, 2010 by DK3WN in RS-22 | No Comments → 20:05 UTC no signals heard
RS-22
Monday, April 12th, 2010 by DK3WN in RS-22 | No Comments → 18:44 UTC no CW beacon, only a short DOKA transmission (608 bit frame length)
RS-22 seems to tumbling fast. There is an strong noise dip every 3 seconds followed by a second one after 1 second.to
RS-22
Tuesday, April 6th, 2010 by DK3WN in RS-22 | 2 Comments → Jim, AC4AV: I have not heard CW telemetry from RS-22 for over a week or so.
A couple days ago, I did hear some interesting audio, but caught the last few seconds before LOS.
audio spectrum
RS-22 is sending short bursts of telemetry every 5 seconds on 435.352 MHz (FM)
This morning I could hear heavy downlink traffic. This data transmission system is called DOKA.
The DOKA modulation is PM with Manchester-encoded data on sidebands.
It uses 4800Bd data, one block contains 256 frames with sync wsequence and frame counter. The length of a RS-22 frame is 608 bit (76 byte).
DOKA telemetry block in a hexdump view
Recent Comments