UPDATE: FOR THOSE THAT WILL NOT READ THE COMPLETE POSTING
THIS RADIO IF IT ONLY SUPPORTS TIER 1 DMR CAN ONLY BE USED IN SIMPLEX MODE AND THUS WILL NOT BE USEFUL TO ACCESS DMR-MARC REPEATERS OR THE BRANDMEISTER REPEATER NETWORK
THEY WILL BE USEFUL TO OPERATE AS A FRS OR GMRS RADIO IN DIGITAL DMR MODE ON TIME SLOT ONE
THE BAOFENG SERIES OF RADIOS HAVE BEEN FAITHFUL RADIOS AT A GREAT PRICE POINT OVER THE PAST YEARS AND AN IDEAL GO-KIT, GLOVE BOX, FIRST RADIO, 7TH RADIO, OR YOUR ONLY RADIO
BUT UNTIL Fujian Nanan Baofeng Electronic Co. CAN CONFIRM IF IT SUPPORTS TIER 2 THE PURCHASER OF THIS RADIO MAY NOT BE HAPPY IF THEY PLAN TO USE IT FOR DMR-MARC OR BRANDMEISTER REPEATER USE
THE 16 CHANNEL SELECTOR IS MISSING ON THE RADIO AS WELL
FOR MORE INFO ON THE STANDARDS GO TO http://dmr-marc.net/FAQ.html or http://ham-dmr.nl/?wpfb_dl=236
I have been alerted by several hundred emails about the launch of the new Baofeng DM-5R (I am the President of the Toronto Baofeng users group – TBUG) claiming a $70 us price and dual band capability. Baofeng China is not returning telephone calls or providing several evaluation units. Manuals , accessories or documentation is lacking. I have not found any FCC or IC type acceptance submissions.
If this is a real radio it well set the new standard for FRS and GMRS capabilities supporting the ETSI DMR standard. Interoperability with the DMR-MARC or Brandmeister Radio networks may be severely limited if initial research demonstrates this being a Tier 1 radio.
There is a lot of confusion about DMR and it is important to understand the various Tiers of operation.
Digital Mobile Radio (DMR) is a standard that has been developed by ETSI – one of the world’s leading standards development organizations. Founded initially to serve European needs, ETSI has grown rapidly to become highly-respected as a producer of technical standards for worldwide use.
The ETSI DMR standard which sets out a digital radio specification for professional, commercial and private radio users. In practice, DMR manufacturers have focussed on building products for the professional and commercial markets for both licensed conventional mode operation (known as DMR Tier II) and licensed trunked mode operation (known as DMR Tier III). DMR is a two slot Time-Division Multiple Access (TDMA) system offering low cost and flexible digital voice and data solutions, and uses a well established 4FSK modulation scheme. The TDMA implementation in DMR offers a spectrum-efficiency of 6.25 kHz per channel whilst also giving the ability to deliver the advanced features that professional users require.
The standards that define DMR consist of four documents:
- TS 102 361-1: the DMR air interface protocol
- TS 102 361-2: the DMR voice and generic services and facilities
- TS 102 361-3: the DMR data protocol
- TS 102 361-4: the DMR trunking protocol
DMR TDMA also brings low infrastructure costs as one repeater can deliver two communication paths. DMR also offers great power efficiency. The standard is designed to operate within the existing 12.5kHz channel spacing used in licensed land mobile frequency bands around the word so making user migration from analogue to digital seamless.
DMR offers many benefits for a user to transition from analog to digital formats.
The ETSI DMR Standard defines three different tiers of operation
- Tier I (unlicensed): DMR equipment works in Direct Mode (unit-to-unit) on public frequencies. Tier 1 DMR devices are best for individuals, recreation, small retail, or other situations that do not require wide area coverage. A repeater is not involved and it supports simplex transmissions.
- Tier II (licensed conventional): This Tier is aimed to be a direct replacement for the analog conventional radio system. These DMR systems operate under individual licenses working in Direct Mode (unit-to-unit) or using a Base Station (BS) for repeating. It has a degree of wide-area coverage and is targeted at users “who need spectral efficiency, advanced voice features and integrated IP data services in licensed bands for high-power communications.”. This is for commercial users and is a typical business repeater system covering a city – wide area.
- Tier III (licensed trunked): DMR trunking systems operate under individual licenses with a controller function that automatically regulates the communications. It also supports packet data services in a variety of formats, including support for IPv4 and IPv6. It is ideal for organizations looking to migrate from MPT-1327/EADS/LTR (logic trunked radio) systems or who want the full benefits of managed trunking, voice and data solution. This is for enterprise multi-site commercial users providing extended coverage across a provincial or even country boundary. This system has multiple repeaters.
If you have a Tier 1 radio, then the benefit to the user is digital format in a unit to unit direct mode environment. i.e. Simplex. This type of radio will not support Mototrbo offered by DMR-MARC or BRandmesster or standalone repeaters.