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Re: [Discuss-gnuradio] Re: D-Star with gnuradio?
From: |
Rafael Diniz |
Subject: |
Re: [Discuss-gnuradio] Re: D-Star with gnuradio? |
Date: |
Sun, 9 Jan 2011 02:28:19 -0200 |
User-agent: |
KMail/1.13.5 (Linux/2.6.32-5-amd64; KDE/4.4.5; x86_64; ; ) |
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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>
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