First SSTV transmission via the ARISSat-1 transponder !
Today morning at 02:58utc I succesfully did a short SSTV test using the linear transponder of ARISSat-1: http://www.pa3guo.com/pa3guo_arissat1_sstv_9aug2011_0258utc.jpg
Prior to this I did some experiments with CW, starting at 50W, going down to 5W. My TS2000 does not go lower as 5W, but I believe even 1W or lower will be audible. In my opinion the transponder uplink is VERY sensitive.
Using the FunCubeController SDR is it nice to see the full downlink spectrum, on the left the CW+BPSK signals, the transponder downlink in the middle, and the FM downlink on the right.
Equipment: Uplink HW: TS2000X, 435MHz, 5W RF power + 12 elements beam Uplink SW: MMSSTV + HRD (doppler control)
Downlink HW: FunCubeDongle (SDR) + SP-2000 preamp + 2x6 elements beam Downlink SW: MMSSTV + DK3WN Satcontrol (doppler/freq control) + HDSDR (SDR)
-- Henk, PA3GUO, The Netherlands
Time to ask for help ...
Somehow my set-up for ARISSat BPSK decoding is not working. My I kindly ask for your suggestions ?
Using an FCD & HDSDR I record the passes. When I play back I see this freq spectrum.
Should such a result (S/N Ratio wise) be enough for the decoder to work ? http://www.pa3guo.com/arissat1_pa3guo_bpsk.jpg
Thanks for your suggestions ! (also on your own settings of HDSDR, eg sampling rate etc.)
Henk, PA3GUO
For those that are not (yet) able to receive ARISSat-1:
Here is a short mp3 recording of (a part of the) spoken telemetry:
Temp(erature) is +27 degrees C(elsius) Battery Voltage is 31.22 Volt Battery Current is -209 milliAmps
http://www.pa3guo.com/arissat1_pa3guo_voice_telemetry.mp3
Pretty nice mode for outreach (including school) activities !
Receiver used: FCD (SDR hardware) + HDSDR (SDR software)
-- Henk, PA3GUO
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