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
--- On Wed, 19/5/10, Woodrick, Ed ewoodr...@ed-com.com 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.
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 @ -