MOTOTRBO is a Motorola digital radio product marketed primarily to business/industrial users. The format is based on, and compatible with the European 2-slot DMR standard and uses Time Division Multiple Access (TDMA) to effectively accommodate two simultaneous users. A single 12.5 kHz channel is able to carry two simultaneous and independent conversations, or simultaneous and independent voice and data paths each with 6.25 kHz equivalency, however the bandwidth of DMR exceedes the maximum required for UHF 6.25 kHz channel centers. Operation of different talkgroups and talkpaths similar to trunking is possible, as is wide-area operation through IP connectivity. MOTOTRBO transceivers and repeater stations may be retrocompatible with analog FM using CTCSS or CDCSS.
Emission designators for MOTOTRBO: 7K60FXE (voice), 7K60FXD (data).
MOTOTRBO is based on the following ETSI standards:
Additional information on DMR is available through the Digital Mobile Radio Association.
No scanner can monitor this digital format by itself but it can be monitored with DSD. Other decoding efforts have been started, such as Ian Wraith's DMRDecode. DMRDecode is unable to decode audio.
DMRDecode is compatible with some SDRs via piping (sending audio thru utilities such as Virtual Audio Cable) including the RTL-SDR.
DMR Decoding Forum Discussion
- CACH is Common Announcement Channel
- TACT is TDMA Access Channel Type
- LC is Link Control
- EMB is Embedded signalling field
- CSBK is Control Signalling Block
Regional Monitoring Wikis
- IP Site Connect
- Connects multiple conventional TRBO repeaters in a wider-area network
- Basic: 8-bit (256 combinations)
- Enhanced: 40-bit (1,099,511,627,776 combinations)
The standard includes provisions for trunking:
Motorola has developed two trunking systems for MOTOTRBO: Capacity Plus and Connect Plus.
- MOTOTRBO Capacity Plus
- Standard Capacity Plus allows voice and data communication at a single site.
- Linked Capacity Plus allows up to 15 sites.
- Up to 12 digital voice talk paths with three sites or less.
- Up to 6 digital voice talk paths with 15 sites.
- Allows up to 24 additional dedicated data paths
- No fixed control channel, instead has a "Rest Channel" (the next available channel, sounds like a control channel) which can hop around. In a standard installation, the rest channel starts at Channel 1 and works up to the highest channel, then returns to Channel 1 and begins the rotation again.
- MOTOTRBO Connect Plus
- Multi-site trunking network that can handle up to 100 registered talkpaths and 30 simultaneous calls
- Each site has a fixed control channel
- XRT 9000 Gateway
- XRC 9000 Controller
MOTOTRBO Portable/Mobile Radios and Repeaters
(Models sold in the United States.)
- XPR 6500 (display, non-GPS)
- XPR 6550 (display, GPS)
- XPR 6300 (non-display, non-GPS)
- XPR 6350 (non-display, GPS)
- SL 7550 (display)
- XPR 7550 (display)
- XPR 7350 (non-display)
- XPR 6580 (display)
- XPR 6380 (non-display)
- XPR 6100 (non-display)
- XPR 3500 (display)
- XPR 3300 (non-display)
- XPR 4500 (full display, non-GPS)
- XPR 4550 (full display, GPS)
- XPR 4300 (numeric display, non-GPS)
- XPR 4350 (numeric display, GPS)
- XPR 4380 (full display, GPS)
- XPR 5350 (numeric display, GPS)
- XPR 5550 (LCD display, GPS)
- XPR 8300
- XPR 8380
- XPR 8400
- MTR 3000
- SLR 5700
MOTOTRBO Systems in Use
Equipment on Ebay