Using coherent PSK demodulation a 1dB SNR in a 1kHz bandwidth is
possible with Codec 2 at around 1200 bit/s. A friend emailed me
recently:
"NBFM 5k dev needs about 6dB CN in a 15kHz BW to be
listenable ...
so the VHFDV should be about 12dB better."
One way an open standard could compete is to outperform the incumbent
analog and newer digital standards by a wide margin.
Cheers,
David
On Tue, 2012-04-17 at 15:57 -0700, Matthew Pitts wrote:
> A lot of people I know are thinking it is a more user friendly version of
> MOTOTRBO
>
> Matthew Pitts
> N8OHU
>
>
>
> ------------------------------
> On Tue, Apr 17, 2012 5:54 PM EDT Trevor . wrote:
>
> >--- On Tue, 17/4/12, Bruce Perens <[email protected]> wrote:
> >> At the end of the D-STAR article in
> >> this month's QST, it mentions that Yaesu will be coming out
> >> with their own digital voice implementation at Hamvention.
> >
> >I believe it uses the same standard Codec as D-STAR GMSK giving 3600 bps
> >voice and 1200 bps data.
> >
> >What is different is the modulation scheme which is 4-FSK resulting in a
> >bandwidth of 4.5 kHz instead of the 8 kHz or so that D-STAR GMSK uses.
> >
> >73 Trevor M5AKA
> >
> >
> >
> >
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