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Digital Mobile Radio (DMR) Overview
In the ever ongoing effort to squeeze more capacity out of a finite resource, the electromagnetic spectrum, a new digital standard, Digital Mobile radio (DMR) emerged.
Whereas the older analogue FM requires 25 kHz channels or for newer systems 12.5 kHz, DMR offers two channels within 12.5 kHz. DMR offers both voice and data communications and interfacing to external networks. Voice communications offer features as call alert, emergency call, remote monitoring, silent worker, Push-to-Talk ID, radio check, all call, stunning etc.
DMR has been standardized by ETSI.
The standard describe three tiers of DMR:
Tier I: Direct mode communication without infra-structure
Tier II: Direct mode and base station repeater
Tier III: Trunking with a controller managing communications, including simulcast and multicast.
To distinguish between adjacent and repeater stations with overlapping coverage, DMR introduces the concept of Color Code.
Interlinking of TRBO repeaters (or base stations) is very easy using Motorola's implementation of the "MOTOTRBO" IP-Site Connect feature - a MOTOROLA proprietary means of using basic IP connectivity such as your home or office internet IP connection, anywhere around the world to link repeaters.
Claude VE2YI • Chris VE2OOK • Cliff VE2YU
Cabane a Sucre 2013 (Click on the image ->) |
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Cabane a Sucre was held on (Click on the image ->) |
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Christmas Party 2011 (Click on the image ->) |
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Corn Roast 2011 (Click on the image ->) |
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Our club's first Field Day (Click on the image ->) Click here to see our QSL Card dedicated to the 2011 ARRL Filed Day |
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Cabane a Sucre was held on April 2nd 2011 (Click on the image ->) |
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Cabane a Sucre was held on March 20th 2010 A good time was had by all. Look in the photo gallery for all the photos. (Click on the image ->) |
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Corn Roast 2010 Was held at Cliff's House and a great time was had by all. Take a look at the photo gallery under Corn Roast 2010. (Click on the image ->) |
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