NEXEDGE is a digital radio brand from Kenwood which uses the NXDN Common Air Interface. The NXDN CAI was developed jointly by Icom and Kenwood and has a following of several companies, known collectively as the NXDN Forum. The NXDN CAI uses Frequency Division Multiple Access (FDMA), employing a 4-level FSK modulation scheme.
Kenwood's brand for NXDN equipment is "NEXEDGE", while Icom's brand for NXDN equipment is "IDAS", or Icom Digital Advanced System.
The following emission designators are used with NEXEDGE:
- 8K30F1E 12.5 kHz single channel digital voice
- 8K30F1D 12.5 kHz single channel digital data
- 8K30F1W 12.5 kHz single channel digital voice and data
- 4K00F1E 6.25 kHz single channel digital voice
- 4K00F1D 6.25 kHz single channel digital data
- 4K00F1W 6.25 kHz single channel digital voice and data
- 4K00F2D 6.25 kHz single channel analog CW ID
Monitoring NXDN / NEXEDGE
No scanner can monitor this digital format by itself but it can be monitored using software decoders DSDPlus or DSD - Digital Speech Decoder fed by a scanner with a discriminator tap, or via many SDRs.
Reportedly the Whistler TRX-1 and TRX-2 will be able to decode NXDN, when a free firmware upgrade is applied. Neither these scanners, nor the firmware, are available as of this writing. The announcement can be found on the Whistler website here
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