Digital Mobile Radio (DMR)

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Digital Mobile Radio (DMR)
DMR.jpg
Frequencies 860 MHz,400 MHz,512 MHz,136 MHz,174 MHz
Frequency Range 136 MHz - 860 MHz
Mode NFM
Modulation 4FSK
ACF Frame: 60 ms, Slot: 30 ms
Bandwidth 12.5 kHz
Location Worldwide
Short Description Digital Mobile Radio (DMR) is an open digital mobile radio standard defined by ETSI and used in commercial products around the world. Mostly used by private network and local police, can be encrypted. Used in MOTOTRBO products.
I/Q Raw Recording Download file
Audio Sample

Digital Mobile Radio (DMR) is an open digital mobile radio standard defined in the European Telecommunications Standards Institute (ETSIEuropean Telecommunications Standards Institute. An independent, not-for-profit, standardization organization in the telecommunications industry in Europe, developing global telecommunications standards.) Standard TS 102 361 parts 1–4 and used in commercial products around the world. DMR, along with P25 phase II and NXDN are the main competitor technologies in achieving 6.25 kHzKiloHertz (kHz) 10^3 Hz equivalent bandwidth using the proprietary AMBE+2 vocoder.

DMR and P25 II both use two-slot TDMATime Division Multiple Access in a 12.5 kHzKiloHertz (kHz) 10^3 Hz channel, while NXDN uses discreet 6.25 kHzKiloHertz (kHz) 10^3 Hz channels using frequency division. DMR was designed with three tiers. DMR tiers I and II (conventional) were first published in 2005, and DMR III (trunked) was published in 2012, with manufacturers producing products within a few years of each publication. The primary goal of the standard is to specify a digital system with low complexity, low cost and interoperability across brands, so radio communications purchasers are not locked into a proprietary solution. In practice, many brands have not adhered to this open standard and have introduced proprietary features that make their product offerings non-interoperable.

Samples[edit]

DMR Trunking Control Channel:





DMR Idling Channel:




DMR Voice (Half Slot TDMATime Division Multiple Access):

Decoded Audio:

Decoding Software[edit]

Hobby Level Software

Decoding Tutorials[edit]


Video Examples[edit]

Additional Links[edit]

Additional Images[edit]