Digital Mobile Radio (DMR)
 | |
|---|---|
| Frequencies | 860 MHz,400 MHz,512 MHz,136 MHz,174 MHz,66 MHz,88 MHz |
| Frequency Range | 66 MHz - 860 MHz |
| Mode | NFM |
| Modulation | 4FSK |
| ACF | Frame: 60 ms, Slot: 30 ms |
| Emission Designator | — |
| 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 and NXDN48 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 Phase II both use two-slot TDMATime Division Multiple Access in a 12.5 kHzKiloHertz (kHz) 10^3 Hz channel, while NXDN48 uses discrete 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 tier 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.
German FreeNet Frequencies[edit]
| Freenet Channel | Frequency (MHzMegaHertz (MHz) 10^6 Hz) | Mode |
|---|---|---|
| 1 | 149.0250 | Analog FMFrequency Modulation / Digital |
| 2 | 149.0375 | Analog FMFrequency Modulation / Digital |
| 3 | 149.0500 | Analog FMFrequency Modulation / Digital |
| 4 | 149.0875 | Analog FMFrequency Modulation / Digital |
| 5 | 149.1000 | Analog FMFrequency Modulation / Digital |
| 6 | 149.1125 | Analog FMFrequency Modulation / Digital |
| 7 | 149.021875 | Digital only |
| 8 | 149.028125 | Digital only |
| 9 | 149.034375 | Digital only |
| 10 | 149.040625 | Digital only |
| 11 | 149.046875 | Digital only |
| 12 | 149.053125 | Digital only |
| 13 | 149.084375 | Digital only |
| 14 | 149.090625 | Digital only |
| 15 | 149.096875 | Digital only |
| 16 | 149.103125 | Digital only |
| 17 | 149.109375 | Digital only |
| 18 | 149.115625 | Digital only |
Samples[edit]
Motorola Capacity Plus Control Channel:
Motorola Capacity Plus Rest Channel:
Hytera Extended Pseudo Trunk (XPT) Beacon:
Motorola® Connect Plus™
DMR Control Channel
Motorola Connect Plus Control Channel:
DMR Voice (Half Slot TDMATime Division Multiple Access):
Decoded Audio:
Decoding Software[edit]
- Hobby Level Software
- Digital Speech Decoder (DSD).
- Recommended use of DSD+.
- DMRDecode For the precompiled binary: Download here
- SDRTrunk
- Professional Software
Decoding Tutorials[edit]
Video Examples[edit]
- Greensboro, NC DMR repeater
- DSD decodor în DMR MOTOTRBO
- 12 minutes of DMR, MotoTrbo signal
- MOTOTRBO Digital Sound Sample
- Digital Voice Decoding with RTL SDR (RTL2832), DSD and SDR Sharp
- DMR Decode - Decoding Mototrbo Transmissions with DSD Digital Speech Decoder
Additional Links[edit]
- DMR vs dPMR
- WAVECOM Database: DMR
- shoc Database: DMR
- RadioReference.com DMR
- Wikipedia DMR
- Radioreference.com MOTOTRBO
Additional Images[edit]
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