PMR Digital Voice

The PMR industry is pressing ahead with VHF and UHF systems providing Digital Voice in 6.25 kHz channel spacing using the NXDN™ standard.

The digital standard being adopted by the industry for Digital Voice seems to be NXDN™ Digital Modulation with a number of key manufacturers already supplying products.

NXDN™ is understood to be a trademark of Icom Incorporated and Kenwood Corporation.

6.25 kHz NXDN™ uses FDMA 4-level FSK modulation using the AMBE+2 voice codec and supports both voice and data.

World Intellectual Property Organisation (WIPO) - NXDN
http://www.wipo.int/ipdl/en/madrid/key.jsp?KEY=915521

NXDN™ Forum Announces its Formal Establishment
http://www.icom.co.jp/world/news/pdf/080714.pdf

AAR moving forward with 6.25 kHz standard
http://falconinfo.blogspot.com/2008/09/aar-chooses-nxdn-digital-standard.html

FalconDirect
http://www.falcondirect.com/hotnews.htm

Sounds of Digital Voice Formats
http://www.w2sjw.com/radio_sounds.html

Digital Mode Samples
http://www.kb9ukd.com/digital/