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Telemetry

Info om telemetri från STRaND-1

Nedanstående information ger lite tips om hur man kan ta emot telemetri från den nya satelliten STRaND-1. Det finns intressant info om hur man kan använda DSP-mottagare tex. FunCube Dongle. Se mitt i texten!

STRaND-1 carries an amateur radio AX.25 packet radio downlink on
437.568 MHz using 9600 bps FSK modulated data with HDLC frame, NRZI
encoding.

Free satellite tracking software:
• SimpleSat Look Down http://www.amsat-uk.org/?p=8217
• Gpredict http://gpredict.oz9aec.net/
• Orbitron http://www.amsat-uk.org/?p=9051

Dr Chris Bridges would be delighted to receive all available
telemetry files by email to C.P.Bridges@surrey.ac.uk

Mark Hammond N8MH has provided these tips to decode STRaND-1:

(1) Sprint-2 TNC set at 9600 baud in KISS mode (or any 9600 TNC in
KISS mode probably)
(2) Using this software to capture
http://www.dk3wn.info/files/online_kiss_plus.zip
(3) And using this software to decode the captured KISS files
http://www.dk3wn.info/files/kissdump.zip

Thanks to Mike Rupprecht DK3WN for the excellent software.

Jan PE0SAT describes how he used the free TNC emulator software
AGWPE and SDR# to decode the telemetry. This approach means you don’t
have to buy a dedicated hardware TNC it simply uses your existing PC
and radio that supports 9600 bps data:

(1) Record a pass using SDR# and a FUNcube Dongle Pro+ and save the
IQ wav file so you can work with it after the pass.
(2) Configure AGW Packet Engine (AGWPE) as a 9600 baud modem using
your audio mixer as input. If you don’t have an audio mixer, use
audio VAC to route the received audio to the AGW audio input.
(3) When the AGW packet engine is running use AGW-Online-KISS from
DK3WN to connect to the packet engine and decode the telemetry.
(4) Open the IQ wav file within SDR# and playback the recorded file
and tune to the correct receive frequency, now you can see decoded
data within Online-Kiss.
(5) Feed the files captured to KISS-Dump

Descriptions of ONLINE KISS +, AGW ONLINE KISS and KISS Dump + are
at http://tinyurl.com/SatSoftwareDK3WN/

The free AGWPE soundcard packet software AGWPE.zip is available at
http://www.sv2agw.com/downloads/

Guide on how to use AGWPE http://www.soundcardpacket.org/

Latest Keps for the objects from the PSLV-C20 launch. Note: At the
current time the object to satellite mapping is not known:

2013-009A
1 39086U 13009A 13057.07723200 -.00000047 00000-0 00000+0 0 66
2 39086 98.6489 247.4456 0046840 48.7060 103.7711 14.45874186 76
2013-009B
1 39087U 13009B 13057.12205894 -.00000045 00000-0 00000+0 0 65
2 39087 98.6295 247.4478 0010362 263.0055 96.9849 14.33603731 70
2013-009C
1 39088U 13009C 13057.12202184 -.00000045 00000-0 00000+0 0 54
2 39088 98.6260 247.4462 0010229 264.9844 95.0146 14.33699090 77
2013-009D
1 39089U 13009D 13057.12196648 -.00000045 00000-0 00000+0 0 52
2 39089 98.6302 247.4430 0009913 269.8258 90.1934 14.33842702 72
2013-009E
1 39090U 13009E 13057.12180062 -.00000045 00000-0 00000+0 0 57
2 39090 98.6314 247.4520 0008151 271.9062 88.1247 14.34269067 79
2013-009F
1 39091U 13009F 13057.12171611 -.00000045 00000-0 00000+0 0 69
2 39091 98.6289 247.4453 0009293 286.2139 73.7956 14.34449938 72
2013-009G
1 39092U 13009G 13057.12216226 -.00000045 00000-0 00000+0 0 62
2 39092 98.6325 247.4484 0010738 258.3712 101.6263 14.33353747 74

For more information visit
http://amsat-uk.org/satellites/strand-1/strand-1-telemetry/

[ANS thanks AMSAT-UK for the above information]

By SM0TGU

Webmaster and member of the AMSAT-SM steering group.

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