[amsat-bb] Re: Decoding GO-32 data

Gould Smith gouldsmi at bellsouth.net
Fri Jan 2 18:11:46 PST 2009

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.

Gould, WA4SXM

----- Original Message ----- 
From: "N1MIW" <n1miw at cox.net>
To: <amsat-bb at amsat.org>
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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