NX-800 UHF Digital & FM Mobile Radio - NEXEDGE KENWOOD
Showing posts with label Worldwide NXDN Network NET. Show all posts
Showing posts with label Worldwide NXDN Network NET. Show all posts
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
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.
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.
NEXEDGE vs TURBO
Was wondering if anyone has any field testing with both and how they compare to each other?
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.
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.
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