/09/aar-chooses-nxdn-digital-standard.html
>
> --- On Fri, 2/10/09, John Hays wrote:
>
> From: John Hays
> Subject: Re: [DSTAR_DIGITAL] Re: ARRL Approves Study Committee to Research &
> Develop Plan for Narrowband Chan
> To: dstar_digital@yahoogroups.com
> Date: Friday
i, 2/10/09, John Hays wrote:
From: John Hays
Subject: Re: [DSTAR_DIGITAL] Re: ARRL Approves Study Committee to Research &
Develop Plan for Narrowband Chan
To: dstar_digital@yahoogroups.com
Date: Friday, 2 October, 2009, 11:14 PM
NXDN uses the same codec/modulation a
I don't see how the system you linked is more efficient than D-Star, in fact
they use an AMBE vocoder (the heart of DStar digital audio) in their technical
specifications.
It runs at the same effective baud rate, 4800, as current D-Star DV modes. The
only difference I actually see is they were
NXDN uses the same codec/modulation as D-STAR, that is why D-STAR DV
is claimed to be 6.25 Khz., the radios may just not be as tight. I
think the Utah VHF Society studies showed that different models of
Icom D-STAR radios exhibited different RF characteristics. http://utahvhfs.org/dstar.html
i, 2/10/09, Charles Scott wrote:
> From: Charles Scott
> Subject: Re: [DSTAR_DIGITAL] Re: ARRL Approves Study Committee to Research &
> Develop Plan for Narrowband Chan
> To: dstar_digital@yahoogroups.com
> Date: Friday, 2 October, 2009, 6:50 PM
> Bosshardss:
>
> An
Bosshardss:
And of course many more recent repeaters can be configured for
narrow-band analog service. There's no reason someone couldn't simply
decide to take a repeater narrow and there's plenty of Hams now with
radios that can do this as well.
Chuck - N8DNX
bosshardss wrote:
> P25 and DSTA
Approves Study Committee to Research &
Develop Plan for Narrowband Chan
Date: October 2, 2009 1:15:40 PM EDT
To: dstar_digital@yahoogroups.com
P25 and DSTAR are naturals for cutting bandwidth. DSTAR is -26db @ +/-3 Khz,
there abouts (going from memory) and the mask is similar to P25. Some of
P25 and DSTAR are naturals for cutting bandwidth. DSTAR is -26db @ +/-3 Khz,
there abouts (going from memory) and the mask is similar to P25. Some of the
new commercial designs will be either 6.25 or 2 talk paths in 12.5 (sharing a
system/frequency - isn't that a novel idea?).
--- In dstar_di
