Nate and any others that are interested
Icom/Kenwood and others use NXDN (4 Level FSK/FDMA 6.25 kHz Technology)
see www.nxdn-forum.org. It is a relatively open digital standard for commercial
equipment for its Over the Air (OTA) communcation protocol.
I believe that an amaueur application would
On May 19, 2010, at 8:55 AM, ve3ei wrote:
>
> Nate and any others that are interested
> Icom/Kenwood and others use NXDN (4 Level FSK/FDMA 6.25 kHz Technology)
> see www.nxdn-forum.org. It is a relatively open digital standard for
> commercial equipment for its Over the Air (OTA) communcation p
The modulation scheme used has the advantage of using half the bandwidth of
D-STAR and both Kenwood and Icom supply a range of VHF and UHF moniles,
handhelds and repeaters.
At a later date there may be some merit in changing the modulation we use for
D-STAR to improve spectrum efficiency.
Th
On May 19, 2010, at 11:06 AM, Trevor . wrote:
The modulation scheme used has the advantage of using half the
bandwidth of D-STAR and both Kenwood and Icom supply a range of VHF
and UHF moniles, handhelds and repeaters.
At a later date there may be some merit in changing the modulation
we
@yahoogroups.com
Subject: Re: [DSTAR_DIGITAL] Icom/Kenwood Digital Protocol was(RE: Honest
Questions)
The modulation scheme used has the advantage of using half the bandwidth of
D-STAR and both Kenwood and Icom supply a range of VHF and UHF moniles,
handhelds and repeaters.
At a later date there may
--- On Wed, 19/5/10, Woodrick, Ed wrote:
> Half the bandwidth of D-STAR? What bandwidths do you believe
> that each uses?
> I thought that they were actually the same at ~6.25 kHz.
D-STAR GMSK is essentially a 12.5 kHz channel spacing system.
http://utahvhfs.org/dstar_channel_spacing.html
4
The FCC defines bandwidth differently for Amateur vs Commercial -
Amateur bandwidth is -26 db points either side of center in the US.
Seems like LMR / PMR is -60 some odd either side of center. When I
looked at the mask it seems like reality for DSTAR was around 12 1/2
khz occupied bandwidth @ - 6
On 5/19/2010 3:29 PM, Steve Bosshard (NU5D) wrote:
> The FCC defines bandwidth differently for Amateur vs Commercial -
> Amateur bandwidth is -26 db points either side of center in the US.
> Seems like LMR / PMR is -60 some odd either side of center. When I
> looked at the mask it seems like realit
