Welcome to the website of the dPMR Association.

This group was established in 2007 to provide a forum for all interested parties who wished to support the latest digital PMR radio technology known as dPMR. The group currently includes radio manufacturers, chip manufacturers, protocol and software developers and systems developers. All these members have expressed the common aim of working together to ensure the success of dPMR. One of the core requirements for success of any new technology is interoperability. The dPMR association will be active in ensuring an independant validation of interworking between dPMR products from different manufacturers and authorising the use of a specific dPMR logo for compliant equipment. These interoperability tests will also be based on ETSI standards. Visit our Interoperability section

What is dPMR?

dPMR™ is a low cost, low complexity, high performance digital radio protocol specifically designed to offer solutions to users requiring an ETSI compliant, multi-vendor, fast deployment two-way radio solution. It employs narrowband (6.25 kHz) FDMA technology for maximum spectrum efficiency in voice and/or data applications and offers conventional and multi-site trunked configurations to provide flexibility and scalability.

dPMR exists in a range of functional levels:

dPMR 446 - This is the licence-free product for use in peer to peer operations without base stations or repeaters in the 446 MHz UHF band. This technology is covered by the ETSI standard TS102 490.


dPMR Mode 1 - This is the general purpose peer to peer application of dPMR for all forms of licenced PMR use. Mode 1 is part of the ETSI standard TS102 658

dPMR Mode 2
- This is the standard licenced PMR version that includes all base station and repeater functionality and allowing interfaces via gateways (Telephone, IP etc) Mode 2 is part of the ETSI standard TS102 658.


dPMR Mode 3 - This is the full functionality of dPMR that can be offered by managed access multisite complex systems including all the same interfaces and gateways as Mode 2.


Spectrum Efficiency

Both TDMA and FDMA technologies achieve the same 6.25kHz narrowband capability via different methods. The difference is that the FDMA system is a 'true' 6.25kHz channel and the TDMA system provides 6.25kHz channel 'equivalence' via the time slots in 12.5kHz band-width. From the perspective that 12.5kHz is considered the current narrowband standard channel spacing, then both systems achieve so called "double capacity". The difference is that the FDMA system is ALWAYS double capacity whether it is used with or without infrastructure. For TDMA, double capacity is ONLY achieved when a repeater is synchronizing the time slots, and that two users are in the same geographical area, accessing the same repeater at the same time.


Visit our Technology Benefits page



dPMR is an ETSI Standard - Why is this important?

ETSI standards could be described in general as being 'definitions and specifications for products and processes requiring repeated use'. They are certainly a set of rules for ensuring quality. ETSI are officially recognized by the European Union as a European Standards Organization. The FDMA protocol specified in both TS102 490 and TS102 658 ETSI standards complies with the European Harmonised Standard EN301 166-2 for use in 6,25 kHz channels. Read More


The dPMR Community

The dPMR™ Association is open to any manufacturer, supplier, user group, administration, laboratory that share our aims for promoting narrowband FDMA technology.

With 18 active members representing some of the biggest companies in global radio communications contributing to its development, you can look forward to the continued success dPMR™ technology with confidence. Visit our Members section

dPMR’s growing community includes the end user, arguably the most important contributor to the success of dPMR. This is evident in the growing number of projects being deployed. Please take a closer look at our Case Studies section for more detailed information on a selection of handpicked systems examples that are already established around the world. Visit our case study section