NXDN aka NexEDGE scanner

NXDN aka NexEDGE scanner

Whistler TRX-2 TRX-1

Whistler TRX-2 TRX-1 is multi-system adaptive digital trunking scanners with Motorola P25 Phase I, X2-TDMA, Phase II and DMR making it capable of monitoring the following unencrypted channels/systems: ...


Receiver The AOR AR-DV1B wideband communications receiver covers 100 kHz to 1300 MHz (less cellular on U.S. consumer "B" version) in traditional analog modes (SSB, CW, AM, FM, S-FM, W-FM) as well as various ...

Kenwood NX-5800 NXDN/DMR/P25 Mobile Radio

Kenwood NX-5800 NXDN/DMR/P25 Mobile Radio Debut, part 1 - YouTube from Ham Radio 2.0’s

NXDN: A brief overview

NXDN is a very narrowband protocol employing 6.25/12.5 KHz FDMA technology (It is generally accepted that 12.5 kHz channel spacing is narrowband as per the FCC mandate.) (More on this later in The history of NXDN™).

NXDN™ is the result of a joint technical alliance between Icom Incorporated and JVC KENWOOD Corporation. At the beginning, the main goals of this collaboration were to provide a low complexity digital two-way radio protocol that satisfied the FCC narrowbanding mandate at the initially proposed deadline of 2005, be a future-proof protocol that would still be viable even when 12.5 kHz spectrum became full and to offer an alternative “de-facto” standard to the Land Mobile Radio (LMR) industry that allowed the development of digital radio products without the

Advantages of DMR versus dPMR / NXDN / NEXEDGE

Advantages of DMR versus dPMR / NXDN / NEXEDGE

What is dPMR?

  • dPMR is an ETSI standardised minimal cost digital radio solution.
  • dPMR standards (TS102 490 and TS102 658) were published in 2007 – after DMR. There are 2 tiers specified – Tier 2, modes 2 & 3 are relevant to professional users.
  • dPMR operates in 6.25kHz channels. Tier2, Mode2 is conventional; Tier2, Mode3 is trunked.
  • NXDN is based on dPMR but is incompatible with it. NexEdge is also derived from dPMR.

What is DMR ?

  • DMR is an ETSI standardized low cost, low complexity, professional digital radio solution designed to migrate analog FM radio users to digital.
  • DMR standards (ETSI TS102 361) were published in 2005. There are 3 ‘Tiers’ specified – Tier II and Tier III are of interest to professional users.

Worldwide NXDN Network NET Schedule

Worldwide NXDN Network NET Schedule

Talkgroup# 65000
Day of the month :  *** Weekly ***
Day of the week :  Saturday
UTC Time ::  17:00
Eastern :  12:00
Mountain time : 10:00
Pacific time : 9:00

NXDN NexEdge Toronto,Ontario CANADA has NO network connect.  About 5 local users are now active.

Ontario NXDN Amateur Radio Repeaters

Ontario NXDN Amateur Radio Repeaters

Frequency Offset Tone Location Call  Use Operational status
  146.8950 -0.6 MHz
  146.9700 -0.6 MHz 118.8 Leamington, DownTown VE3TOM OPEN ON-AIR
  442.6000 +5 MHz 100.0 Dunnville VE3LOW OPEN ON-AIR
  443.0500 +5 MHz 103.5 Toronto, BMO Building VE3YYZ OPEN ON-AIR
  444.2250 +5 MHz
Richmond Hill VE3YRC OPEN ON-AIR

NXDN World Wide

A few of us have been working pretty hard. The fruits of those labors are starting to show. I've got reflectors built and functional. This solves one of the major shortcomings of the both the Kenwood and Icom software where they are limited to 15 IP addresses that they can link to. I've also got support for running them over private IP address spaces so you can run them on a 4g wireless connection if you want too.

Next up is protocol conversion between Icom and Kenwood, and then smart portals that will honor local vs linked traffic without needing to build up or tear down a link.

NEXEDGE what is

NEXEDGE what is it

No they do not do training videos, hence my video. I set this up using the add on software ($299) and two Nexedge radios.


Was wondering if anyone has any field testing with both and how they compare to each other?

I use both Mototrbo and Nexedge everyday.
Voice quality goes to Mototrbo
Nexedge portables really like to de-sense each other
Would much rather use CPS vs KPG111d
Nexedge wins hands down in multi-site systems until Mototrbo Connect Plus is released
Mototrbo repeaters running Capacity Plus can handle 4x what NXDN can
Nexedge is cheaper!

Kenwood NEXEDGE, Icom IDAS, and NXDN are all more or less identical terms for the same CAI. I will use NXDN because it is easier to type.

Bandwidth: NXDN is inherantly a true 6.25 bandwidth. TURBO is 12,5 but by using TDMA time sharing infrastructure has two voice channels per 12.5 to acheive equivelent spectrum useage, except in simplex where only one voice channel is used per 12.5. There may be future 'enhancements' that allow one entire voice transmission to be contained in a 6.25 envelope but it will require an overhaul of their hardware as well. The 'equivelancy' term was added to future FCC standards by Motorola over the objections of the rest of the industry, and fueled by lobbying and campaign contributions, all according to Motorola's business model.

Voice quality: Highly subjective to the listener's ear. Remember that the purpose of the exercise is to transmit intelligible voice, not High-Fi music. Diffrerent persons transmitting, or the simple amount of metallic dust stuck to the speaker cone will make one sound better than the other. Overall a wash, however both are better than the latest incarnations of P25 and exponentially better than analog.

Building a NXDN amateur radio repeater

Building a NXDN amateur radio repeater

I have designs on setting up a very local NXDN repeater sometime next year. IDAS repeaters aren't that expensive, and I have access to rooftop space at a local apartment highrise. It would be nice if I could convince an owner of one of the seemingly 4000 unused 70cm repeaters in this city to convert.

So far, I've met a lot of nice dudes in ham radio, but a lot of guys seem to be very rooted in the distant past. The only moves made towards digital in the area seems to be NHARC converting a 2m and a 70cm repeater to DSTAR, and the CMU guys have a mixed mode analog/P25 70cm repeater on the air. To put it lightly, I don't believe DSTAR has a future. After seeing the possibilities, I also believe that analog FM will be extinct in 20 years. NXDN and TRBO are superior to P25 and DSTAR, and will be the digital modes of the future.




Icom FR5000 VHF | FR6000 UHF Repeater

Digital + Analog, Trunking Capable

Icom Repeater FR5000 | FR6000 - IDAS Repeater

  • Scalable from 1 to 30 channels per site and up to 16 sites (48 sites with installation of UC-FR5000 and CF-FR5000MT see below).
  • Trunking Capable
  • Double Channel Capacity
    IDAS doubles the capacity of the current 12.5kHz channel allocation. The IDAS system occupies only 6.25kHz spacing per channel. With the improved sensitivity of narrow band communications, increased communication greater than 12.5kHz analog mode can be achieved. Icom allows you to meet any narrow banding requirements today, and provides a solution to any future spectrum deficiencies.