Hello Larry,
Yes you can record AO-51 & GO-32 digital data using your sound card.
Douglas Quagliana has written a program to record and play back 9600 bps data. This is very useful in checking out your ground station and looking at the data later. AMSAT offers a Digital Disk with these programs and it has already recorded 9600 bps digital files to check out your demodulating and decoding system and software. WiSP and TLMEcho are also on the Digital Disk to decode and display the digital data.
...I receive GO-32 quite well with an S-5 or better on some passes, so receiving the signal is not an issue.
I have an FT-847 and I can't decode at S 5 (your mileage may vary), the DCD LED lights which means that the modem can recover the clock, but I am a long way from full decode of the data. You need a very good S/N ratio to reliably copy the TLM.
AO-51 will probably be in TLM mode next week, so you can try, it probably will be running 700-800 mW. I need a pre-amp at the antenna to reliably copy AO-51 and GO-32 digital data.
73, Gould, WA4SXM
----- Original Message ----- From: "N1MIW" [email protected] To: [email protected] Sent: Friday, January 02, 2009 7:26 PM Subject: [amsat-bb] Decoding GO-32 data
I was wondering if anyone has tried to record a .WAV file of this bird & decode it later on. I've seen some archived posts where MixW was used, but it wasn't clear what the individual did to set up the software. I've tried tinkering around myself with MixW - I played the file back & ran a cable from the speaker out to the line in on my computer, but I don't think I had the 9K6 protocol set properly in the program (basic changing of the parameters didn't work either).
I guess I'm looking to "cheat" from you guys since I can't get any decodes. Is what I'm trying to do even possible?
For a little info on my station setup:
FT-847 audio is captured from the DATA port for 9K6 & higher speeds auto track for antennas & doppler Audio recording in 8khz mono (could there be a problem here???)
...I receive GO-32 quite well with an S-5 or better on some passes, so receiving the signal is not an issue. Even if it's just sending telemetry right now, it would be fun to play with the high-speed data. Is there another program I could use for decoding the data? Any help is appreciated! 73's from FN41
...Larry N1MIW
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