Digital Mobile Radio (DMR) is a digital radio standard developed by the European Telecommunications Standards Institute (ETSI) to address the need for a low-complexity, low-cost digital standard for professional mobile radio users.
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Here is a summary of key DMR frequencies for both simplex and repeater use in the United States and Canada:
DMR Simplex Frequencies
- 441.0000 MHz (UHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
- 446.5000 MHz (UHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
- 446.0750 MHz (UHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
- 433.4500 MHz (UHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
- 145.7900 MHz (VHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
- 145.5100 MHz (VHF, Talkgroup ID: 99, Time Slot: 2, Color Code: 1)
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DMR Repeater Frequencies
Repeater frequencies vary by region and network. Here are some examples from Indiana:
- 443.98750 MHz (+5 MHz offset, Color Code: 1, Network: Brandmeister)
- 444.35000 MHz (+5 MHz offset, Color Code: 1, Network: Tri-State DMR)
- 443.92500 MHz (+5 MHz offset, Color Code: 1, Network: Crossroads)
- 444.05000 MHz (+5 MHz offset, Color Code: 1, Network: Crossroads)
- 442.18750 MHz (+5 MHz offset, Color Code: 1, Network: Brandmeister)
- 444.17500 MHz (+5 MHz offset, Color Code: 1, Network: Crossroads)
Using DMR Frequencies
For effective DMR use, ensure your radio settings are correct:
- Admit Criteria: Always
- In Call Criteria: TXI or Always
- Color Code (CC): 1
- Time Slot (TS): 2 (applicable for most radios)
To search for more specific frequencies in your area, you can use tools like the Digital Frequency Search which provides a comprehensive database of DMR frequencies by county and state.
Usage and Applications
DMR is used in various fields, including public safety, utilities, transport, and industry. It is also popular among amateur radio operators. DMR systems can be set up as standalone networks or connected to larger networks, such as the Brandmeister network, to allow for worldwide communication.
Technical Standards
The DMR standard is defined by the following ETSI documents:
- ETSI TS 102 361-1: Air interface protocol
- ETSI TS 102 361-2: Voice and generic services and facilities
- ETSI TS 102 361-3: Data protocol
- ETSI TS 102 361-4: Trunking protocol
Equipment
DMR radios are available from various manufacturers including Motorola, Hytera, and TYT. They range from simple hand-held radios to complex base stations and repeaters.
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