Radioddity has updated the DM-5R listing with this cryptic note about Tier II support:
“Support DMR repeater function (DMR Tier I; support Tier II if upgraded with less than $10)”
DMR Tier II & Tier III: what’s the difference?
Digital Mobile Radio (DMR) was originally developed as a direct replacement for analogue private mobile radio to provide cost-effective, low-complexity digital radio solutions for transport and utilities.
Offering digital audio quality, better spectral efficiency, improved data capability and enhanced portable battery life, DMR has now expanded its scope to include business-critical and commercial communications.
The DMR suite of standards is developed and managed by ETSI in conjunction with vendor members of the DMR Association, which also ensures multi-vendor interoperability and promotes the technology. The standards are defined in operational ‘tiers’:
Tier I specifies short range licence-free low power operation, mainly for personal or recreational use.
Tier II specifies conventional operation in licensed bands.
A licence from a national regulator allows radios to operate at a higher power, allowing them to transmit over longer distances, and in a dedicated part of the radio spectrum. Communication services may feature repeater networks, advanced call services, data services, telephone interconnect, dispatch connection and secure communications.
Tier III adds full digital trunking operation to Tier II capabilities, based upon the MPT1327 analogue trunking open standard, whereby radio channels that are available can be shared amongst users more efficiently.
Radioddity GD-55 Plus UHF 400-480MHz Waterproof DMR Digital Radio,10W with 2800mAh Battery Mototrbo Dual Time Slot (Tier I&II)
Brief introduction for Radioddity GD-55 Plus, A Practical DMR GD-55 Plus Differentiating Factors 10W High Power IP-67 Waterproofed Mototrbo Tie... Read more
Yaesu FTM-3207DR and FT-2980R will be available late summer / early fall! Yaesu FT-2980R 80W FM 2M Mobile Transceiver As its model name suggests, the... Read more
KIRKLAND, Wash. (May 2017) – Adventure awaits with the new Icom ID-4100A VHF/UHF Dual Band Transceiver. A compact and smart design, this is the perfec... Read more
TYT DM-UVF10 ,a dualdisplay, dual standby two-way radio,adopts high-technology and novel designDM-UVF10 adopts humanism design,making it smart... Read more
Motorola Solutions continues to design digital radio solutions for firefighters and has added the APX 8000XE two-way radio and APX XE500 RSM to its li... Read more