Re: [Discuss-gnuradio] Re: D-Star with gnuradio?

[Rafael Diniz]

Wow, G4GUO is great ham operator Charles Brain.
May be he is here in this mailing list, I don't know. 

Best regards,
Rafael Diniz

> schrieb Rafael Diniz on 2011-01-09 03:56:
> > Hi Patrick,
> > Thanks for the answer.
> > I know about codec2, but how about what modulation to use?
> > I read about the AOR ARD9000MK2[1] modem, that uses the:
> > "G4GUO open protocol".
> > Do you know if is possible to implement this OFDM based one?
> 
> Unfortunately I could not find any document that describes the G4GUO
> protocol. Would be very interested too.
> 
> From http://www.aorusa.com/ard9800.html I got:
> 
> Modulation method:    OFDM
> Band width:   300 Hz - 2500 Hz, 36 carriers
> Symbol Rate:  20 mS (50 baud)
> Guard interval:       4mS
> Tone steps:   62.5 Hz
> Modulation method:    36 carriers: DQPSK (3.6K)
> AFC:  +/- 125 Hz
> Error correction:     Voice: Golay + Hamming
> Video/Data: Covolution + Reed-Solomon
> Header:       1 Sec. 3 tones + BPSK training pattern for synchronization
> Digital voice:        AMBE2020 coder, decoder
> Signal detection:     Automatic Digital detect, Automatic switching
> between analog mode and digital mode
> Video Compression:    AOR original adaptive JPEGFrom
> 
> Seems not too far off to implement in Gnu Radio/USRP.
> 
> Patrick
> 
> 
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