Field Guide · protocol

Also known as: NXDN, NEXEDGE, IDAS

NXDN is a narrowband digital land-mobile radio standard jointly developed by Kenwood (NEXEDGE) and Icom (IDAS). It uses 4FSK in very narrow 6.25 kHz channels (or 12.5 kHz) and the AMBE+2 vocoder.1

frequency one call per channel (6.25 kHz)one call per channelone call per channel
NXDN packs calls into very narrow 6.25 kHz (or 12.5 kHz) FDMA channels.

Overview

NXDN emphasises spectrum efficiency, fitting a channel into as little as 6.25 kHz — half the width of typical DMR or P25 channels. It supports both conventional operation and trunking with a control channel.

Technical characteristics

Property Value
Access FDMA
Channel 6.25 kHz (2400 baud) or 12.5 kHz (4800 baud)
Modulation 4FSK
Vocoder AMBE+2

History

Introduced in the late 2000s as Kenwood and Icom’s common air interface for narrowband digital business radio.1

Deployment

Common in business, transport, and utility fleets, especially where regulators reward 6.25 kHz channelisation.

Decoding it with GopherTrunk

GopherTrunk decodes NXDN voice and follows trunked NXDN control channels. See Status.

Sources

  1. NXDN — Wikipedia, for the Kenwood/Icom narrowband 4FSK air interface, channel widths, and the AMBE+2 vocoder. ↩ ↩2

See also

Learn it step by step

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