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

[Rafael Diniz]

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?

Best regards,
Rafael Diniz

[1] - http://www.aorusa.com/ard9000.html

> schrieb Rafael Diniz on 2011-01-08 03:30:
>> Hi people,
>> Have anyone successfully built a D-Star transmitter with gnuradio
>> blocks?
>
> For the protocol part, see the archives[1]. IMO D-Star is a thing to
> make money rather than a system to foster independent communication.
> There are legal, privacy and free implementation issues.
>
> For the codec parth D-Star uses AMBE+ as codec, which is non-free. You
> can buy codec ICs, but you cannot implement it in Open Source. See the
> archives again for a discussion.
>
> Have a look at "codec2" [2], this should work fine for quite the same
> requirements: low NF bandwidth, low bitrate, low latency.
>
> Regards Patrick
>
> [1]
> http://search.gmane.org/?query=%22d-star%22&author=&group=gmane.comp.gnu.radio.general&sort=relevance&DEFAULTOP=and&xP=d%09star&xFILTERS=Gcomp.gnu.radio.general---A
> [2] http://www.rowetel.com/blog/codec2.html
> [3] http://codec2.org/
>
>
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