Re: [digitalradio] Digital voice in general

2009-12-14 Thread Andy obrien
James, many of us did a lot with digital voice a couple of years ago (search
the archives of this group for LOTS of info.  It worked quite well IF there
was a good signal to noise ratio.  It began to decline in interest when the
main codec used was declared to be in violation of a commercial copyright
and the software developers dutifully switched to a different codec.  The
newer codec did not produce the same quality of digital voice.  Al of this
was software, not hardware, based...using PC soundcards.

Andy K3UK

On Mon, Dec 14, 2009 at 3:31 PM, James French wrote:

>
>
> Wondering if anyone has done any digital voice other than with
> the AOR unit?
>
> What I am looking for specifically is software done (if possible)
> and then manufactured units or kits.
>
> Would like to give it a try on VHF then move to HF if there is any
> activity.
>
> James W8ISS
>  
>


Re: [digitalradio] Digital voice in general

2009-12-14 Thread Joe Veldhuis
Have you ever tried FDMDV? Very narrow (~1200 Hz), all-software digital voice 
protocol that sounds pretty good and, due to the low bandwidth, works well with 
low power. Look for activity around 14.236 USB.

As far as VHF goes, D-STAR is getting pretty popular worldwide. Of course, 
there currently aren't any implementations other than Icom's overpriced radios.

-Joe, N8FQ

On Mon, 14 Dec 2009 15:31:18 -0500
James French  wrote:

> Wondering if anyone has done any digital voice other than with
> the AOR unit?
> 
> What I am looking for specifically is software done (if possible)
> and then manufactured units or kits.
> 
> Would like to give it a try on VHF then move to HF if there is any
> activity.
> 
> James W8ISS


[digitalradio] Digital voice in general

2009-12-14 Thread James French
Wondering if anyone has done any digital voice other than with
the AOR unit?

What I am looking for specifically is software done (if possible)
and then manufactured units or kits.

Would like to give it a try on VHF then move to HF if there is any
activity.

James W8ISS