Next Generation Digital Narrowband (NXDN)

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Next Generation Digital Narrowband (NXDN)
NXDN.jpg
Frequencies 136 MHz,174 MHz,400 MHz,520 MHz
Frequency Range 136 MHz - 520 MHz
Mode NFM
Modulation C4FM
ACF 80 ms
Emission Designator —
Bandwidth 6.25 kHz,12.5 kHz
Location Worldwide
Short Description NXDN is a digital narrowband trunked radio protocol used in commercial, business & industry, transport and Public Safety professional radio systems.
I/Q Raw Recording Download file
Audio Sample

NXDN is a digital narrowband trunked radio protocol developed by ICOM Inc. and JVCKENWOOD Co. The NXDN protocol is used in commercial, business & industry, transport and Public Safety professional radio systems. NXDN has recently been recognized by the ITU as an international digital radio communications standard.

NXDN uses FDMAFrequency Division Multiple Access, and a NXDN channel be either 12.5 kHzKiloHertz (kHz) 10^3 Hz or 6.25 kHzKiloHertz (kHz) 10^3 Hz wide. 6.25 kHzKiloHertz (kHz) 10^3 Hz dual-channel systems can be configured to fit within a 12.5 kHzKiloHertz (kHz) 10^3 Hz channel. This effectively doubles the spectrum efficiency compared to an analog FMFrequency Modulation system occupying a 12.5 kHzKiloHertz (kHz) 10^3 Hz channel. The architecture of NXDN is such that two NXDN channels, within a 12.5 kHzKiloHertz (kHz) 10^3 Hz channel for example, can be allocated as voice/voice, voice/data, or data/data.

Kenwood's brand for NXDN equipment is "NEXEDGE", while Icom's brand for NXDN equipment is "IDAS", or Icom Digital Advanced System.

Characteristics[edit]

There are two main modes, NXDN96 and NXDN48.

Characteristics NXDN48 NXDN96
Bandwidth 6.25 kHzKiloHertz (kHz) 10^3 Hz 12.5 kHzKiloHertz (kHz) 10^3 Hz
Symbol Rate 2400 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. 4800 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.
Data Rate 4800 bpsBits per second (bps) 9600 bpsBits per second (bps)
FDMAFrequency Division Multiple Access Channels 2 Per 12.5 kHzKiloHertz (kHz) 10^3 Hz Channel 1 Per 12.5 kHzKiloHertz (kHz) 10^3 Hz Channel
Speech Codec Rate 3600 bpsBits per second (bps) 3600 bpsBits per second (bps) (7200 bpsBits per second (bps) option)
C4FMContinuous 4-Level Frequency Modulation Frequency
Deviation 		± 1050 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., ± 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). ± 2400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz)., ± 800 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).

Samples[edit]

NXDN48 NXDN96
NXDN 6.25.jpg
NXDM 12.5.jpg

Additional Samples[edit]

NXDN Idle Channel
NXDN idle channel.jpg

NXDN48 Trunking Channel:

Analog FMFrequency Modulation Voice vs NXDN Digital Voice


NXDN96[edit]

Trunking Signal Sample:

Signal with Digital Voice:


Decoded Audio:

Frequencies[edit]

VHFVery High Frequency (30-300 MHz) (136-174 MHzMegaHertz (MHz) 10^6 Hz) and UHFUltra High Frequency (300-3000 MHz) (400-520 MHzMegaHertz (MHz) 10^6 Hz) bands.

Video Examples[edit]

Decoding Software[edit]

Hobby Level Software


Professional Software

Decoding Tutorials[edit]


Additional Links[edit]

Additional Images[edit]

  • This is an idling NXDN48 signal reported on 19 September 2015‎ in Austria at 447.135 MHzMegaHertz (MHz) 10^6 Hz used by The "Kunsthalle" Vienna. It was reported with its counterpart at 447.350 MHzMegaHertz (MHz) 10^6 Hz, which is a NXDN96 signal, used by the Vienna Schatzkammer
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