Decoding FFSK ?

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astro_boy
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Joined: Wed Aug 13, 2008 7:41 am

Decoding FFSK ?

Post by astro_boy » Tue Aug 07, 2012 7:48 pm

I've noticed a local group are using some kind of FFSK on the end of their transmissions,
From what i can find its a 1200bps system, heres some info; http://warps.com.au/what_is_warps.pdf

My question is, has anyone used some software to decode such data before?
I would be interested to know if i could get my hands on some to test and attempt to decode

Cheers :D

citabria
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Re: Decoding FFSK ?

Post by citabria » Tue Aug 07, 2012 9:05 pm

Perfect candidate for GNUradio companion. Even has built in FSK blocks and scope sinks to help you out ;)

Sigint
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Joined: Sun Jan 24, 2010 10:44 pm

Re: Decoding FFSK ?

Post by Sigint » Wed Aug 08, 2012 11:23 am

astro_boy wrote: . . My question is, has anyone used some software to decode such data before?
I would be interested to know if i could get my hands on some to test and attempt to decode
Have you considered trying any of the Amateur Radio APRS (Automatic Position Reporting System) software.

--
Sigint

astro_boy
Posts: 289
Joined: Wed Aug 13, 2008 7:41 am

Re: Decoding FFSK ?

Post by astro_boy » Wed Aug 08, 2012 8:57 pm

Gnuradio looks really in depth! maybe im getting myself into something way beyond what i can understand.

As for the APRS, no i didn't think about that.
I'll have to see if there are any programs that might do what im after.

astro_boy
Posts: 289
Joined: Wed Aug 13, 2008 7:41 am

Re: Decoding FFSK ?

Post by astro_boy » Wed Aug 08, 2012 10:13 pm

I took some recordings of what i wish to decode, have a listen...

http://astro.hopto.org/ffsk1.mp3
http://astro.hopto.org/ffsk2.mp3
http://astro.hopto.org/ffsk3.mp3

citabria
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Re: Decoding FFSK ?

Post by citabria » Wed Aug 08, 2012 11:18 pm

Are they taken from a disc tap?

astro_boy
Posts: 289
Joined: Wed Aug 13, 2008 7:41 am

Re: Decoding FFSK ?

Post by astro_boy » Wed Aug 08, 2012 11:25 pm

no unfortunately,
but i can, it will just take some time.

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