ARISSAT-1 Heard it :)
It's things like this that keep me excited about Amateur Radio! I copied the FM downlink on the Aug 9 0543Z pass last night in Torrance, Calif. Used a VX7 with a ¼ wave magmount on the car. Will need to try my Arrow yagi next time. I copied the majority of the pass from the VERY weak AOS through moderately strong to the VERY weak LOS. I clearly heard the voice telemetry and the very end of the English kids message, then a foreign language kids message. I even heard the distinctive SSTV at the very end as it was approaching LOS. I will have to download MSSTV and see if I got anything. Next time, I will remember my audio cord and try to get a better recording rather than holding the recorder next to the radio.
73's and good luck – de KA6WNK
Just a few minutes after the last pass i had a lucky shot :-)toggle quoted messageShow quoted text
I tried to decode telemetry live with the tlm soft, hdsdr, funcube, orbitron
, vac ...
I could not decode it while sat was flying over me :-(
But I recorded the rf stream from hdsdr and played it back another time
Now I had to compensate doppler by hand (not by orbitron) and I could decode
a complete kursk frame and upload it to the internet
Now I checked the fm transmissions (again replayed the recorded rf)
And I could make a wave file with the spoken telemetry data
... so guys what you can never do with a analog radio:
Play back and forth in an rf stream and take this or that transmission and
decode it later :-)
If you really wanna play around with this ... ask your xyl for some pocket
money and buy a funcube dongle
Or any other sdr frontend ... maybe just a downconverter from your
conventional rig for the first steps in sdr (been there done that) ... and
after you find out what sdr can do for you you will sure buy also an fcd
You can work live via arissat (uhf up 2m down) and record the audio and sstv
while you have a qso right next to it
So work over the sat and record the rf stream with sdr soft ... after the
pass is over you can play it back another time and see who else was on the
sat or you can decode the telemetry or sstv pictures
SDR ROCKS :-)
toggle quoted messageShow quoted text
--- On Tue, 8/9/11, cap_cstorey wrote:
John Mcfadden <jmcf2005@...>
Hi Forrest,toggle quoted messageShow quoted text
I'm not sure if you recorded the SSTV audio directly on to your computer from the radio or made a recording on a digital recorder to then transfer to the computer. I downloaded MMSSTV and although there are files you can use to test it, it wasn't clear (to me!) how to get the software to read the test audio files on your computer.
When ARISSat was being tested from the ISS, I recorded the SSTV audio during a pass using a small digital recorder with a cable( with 3.5mm jack on each end) connecting the radio to the microphone socket on the recorder. After the pass I went back inside and started up MMSSTV and then just plugged one end of same cable into the earpiece socket on the recorder and the other into the microphone socket on my computer. I didn't adjust any input levels. I pushed play on the recorder and MMSSTV started decoding and displaying the image immediately.
It seems like the software is either set for a mic or line input as a default and it definitely would be nice to how to switch it so that you can decode audio files on your computer.
--- In Work-Sat@yahoogroups.com, Forrest Johnson <fejohnso@...> wrote:
To decode recorded files (wave files)toggle quoted messageShow quoted text
Set record in in windows mixer to "what you hear" "speaker out" "sum" "lineout" ...
Play the wave file with a waveplayer (any will do)
Start mmsstv decoding
Now mmsstv uses the speaker out of the mixer as its input
How did you record the passes
With software defined radio? Hdsdr??
Or with a conventional recorder the fm downlink??
Arissat has a telemetry and cw beacon on 145919 (for decode you have to tune
500 hz lower in usb) and a fm transmitter on 145950
And the output of its linear transponder (uhf up 2m down) in between those
On 950 there are these signals interchanged >>> sstv pics stored, sstv pics
from one of the cameras, spoken telemetry (computer voice), spoken greetings
in many languages (spoken from kids and stored on the sat) ...
For receiving the sstv pics you have just to use ANY sstv programm
Mmsstv or others will work
For decoding the telemetry you have to use the arissat tlm software
further info about reception, reception challenge, "the secret words
challenge" etc can be found here:
if you recorded the pass with an sdr (hdsdr or similar) you can play it
back, decode the telemetry, play it again and listen to voice (or receive a
hope I could help a bit :-)