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Difference between revisions of "DMR"

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=== DMR Tier III ===
 
=== DMR Tier III ===
 
DMR Tier III covers trunking operation in frequency bands 66-960MHz.  The Tier III standard specifies two slot TDMA in 12.5kHz channels.  Tier III supports voice and short messaging handling similar to MPT 1327 with built-in 128 character status messaging and short messaging with up to 288 bits of data in a variety of formats.  It also supports packet data service in a variety of formats, including support for IPv4 and IPv6.
 
DMR Tier III covers trunking operation in frequency bands 66-960MHz.  The Tier III standard specifies two slot TDMA in 12.5kHz channels.  Tier III supports voice and short messaging handling similar to MPT 1327 with built-in 128 character status messaging and short messaging with up to 288 bits of data in a variety of formats.  It also supports packet data service in a variety of formats, including support for IPv4 and IPv6.
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==Monitoring DMR==
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You can use the following to decode a DMR Transmission.
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; Uniden Scanners
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* [[BCD436HP]] with paid firmware [http://info.uniden.com/twiki/bin/view/UnidenMan4/DigitalMobileRadioUpgrade upgrade]
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* [[BCD536HP]] with paid firmware [http://info.uniden.com/twiki/bin/view/UnidenMan4/DigitalMobileRadioUpgrade upgrade]
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; Whistler Scanners
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*{{color|red|'''NOTE:'''}} These upgrades are '''NOT''' compatible with the RS or GRE versions of these radios.
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* [[WS1080]] with free firmware upgrade (not yet released)
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* WS1088 with free firmware upgrade (not yet released)
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* [[WS1095]] with free firmware upgrade (not yet released)
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* WS1098 with free firmware upgrade (not yet released)
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* TRX-1 (not yet released)
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* TRX-2 (not yet released)
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; Other Receivers / Scanners
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* [http://www.universal-radio.com/catalog/widerxvr/6369.html AOR DV-1] (note: No trunking)
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* Using [[Digital Speech Decoder (software package)|DSD]] or [[DSDPlus]], along with a discrimintor tapped scanner. [https://github.com/IanWraith/DMRDecode DMRDecode] may be used to view system information
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* Using [[Digital Speech Decoder (software package)|DSD]] or [[DSDPlus]] with many SDRs. [https://github.com/IanWraith/DMRDecode DMRDecode] may be used to view system information
  
  

Revision as of 06:24, 29 May 2016

Digital Mobile Radio (DMR) is an open digital radio standard for Professional Mobile Radio (PMR) users by the European Telecommunications Standards Institute (ETSI) Standards TS 102 361 parts 1 to 4 and used in products sold in all regions of the world. The applicable compliance standards are EN 300 113 and EN 300 390. Products built to the DMR standard also comply with the FCC mandates in the United States for the use and certification of 12.5 kHz and 6.25 kHz narrowband technology for systems covered by Part 90 regulations.

The DMR standard operates within the existing channel spacing used in land mobile frequency bands globally. Its primary goal is to specify a digital system with low complexity, low cost and interoperability across brands, so radio communications purchasers are not locked in to a proprietary solution. DMR provides voice, data and other supplementary services. DMR is a two-slot, Time Division Multiple Access (TDMA) system offering voice, data and a range of other features and applications.

In 2005, a Memorandum of Understanding (MOU) was formed with potential DMR suppliers including Tait, Fylde Micro, Selex, Motorola, Vertex Standard, Kenwood and Icom to establish common standards and interoperability. While the DMR standard does not specify the vocoder, MOU members agreed to use the half rate DVSI Advanced Multi-Band Excitation (AMBE) vocoder to ensure interoperability. In 2009 the members of the MOU set up the DMR Association to work on interoperability between vendors equipment and to provide information about the DMR standard.


DMR Tiers

DMR Tier I

DMR Tier I products are for license-free use in the 446MHz band.

This part of the standard provides for consumer applications and low-power commercial applications, using a maximum of 0.5 watt RF power. With a limited number of channels and no use of repeaters, no use of telephone interconnects, fixed/integrated antennas, and a talk timer of 180 seconds, Tier I DMR devices are best suited for personal use, recreation, small retail and other settings that do not require wide area coverage or advanced features.

DMR Tier II

DMR Tier II covers licensed conventional radio systems, mobiles and hand portables operating in PMR frequency bands from 66-960MHz. The ETSI DMR Tier II standard is targeted at those users who need spectral efficiency, advanced voice features and integrated IP data services in licensed bands for high-power communications. ETSI DMR Tier II specifies two slot TDMA in 12.5 kHz channels.

No scanner can monitor this digital format by itself but it can be monitored with DSDPlus or DSD. Other decoding efforts have been started, such as Ian Wraith's DMRDecode. DMRDecode is currently unable to decode audio, and no further development has taken place since May 2014.

DMR Tier II is based on the following ETSI standards.

DMR Tier III

DMR Tier III covers trunking operation in frequency bands 66-960MHz. The Tier III standard specifies two slot TDMA in 12.5kHz channels. Tier III supports voice and short messaging handling similar to MPT 1327 with built-in 128 character status messaging and short messaging with up to 288 bits of data in a variety of formats. It also supports packet data service in a variety of formats, including support for IPv4 and IPv6.


Monitoring DMR

You can use the following to decode a DMR Transmission.

Uniden Scanners


Whistler Scanners
  • NOTE: These upgrades are NOT compatible with the RS or GRE versions of these radios.
  • WS1080 with free firmware upgrade (not yet released)
  • WS1088 with free firmware upgrade (not yet released)
  • WS1095 with free firmware upgrade (not yet released)
  • WS1098 with free firmware upgrade (not yet released)
  • TRX-1 (not yet released)
  • TRX-2 (not yet released)


Other Receivers / Scanners


Related Links