Difference between DMR Tier 1, DMR Tier 2

Digital Mobile Radio (DMR) is an international digital radio standard developed by the European Telecommunications Standards Institute (ETSI), What DMR techniques to provids: 

• Improved voice quality；

• Improved functionality such as Location information；

• Improved security (i.e. Authentication and Encryption；

• Improved channel efficiency (2 slot TDMA)；

And it has 3 different DMR standards: DMR Tier 1, DMR Tier 2, DMR Tier 3. Today we are going to say the difference between DMR Tier 1 and Tier 2. 

DMR Tier 1 features:  

• 1.It uses 446 MHz frequency band in Europe and US,licence free band.
  

• 2. ETSI specification defines two time slots in 12.5 KHz channels as per TDMA structure.
  

• 3. The DMR Tier-1 devices transmit maximum power of 0.5Watt. It mean the power limit to 0.5W. 

• 4. Works in Direct Mode (Radio-to-Radio).

• 5. Tier 1 DMR devices are best for individuals, recreation, small retail, or other situations that do not require wide area coverage.

DMR Tier 2 features：

• 1. It uses 66 to 960 MHz frequency band. License Need. 

• 2. This licenced band is used for mobile phones and conventional radio systems.

• 3. DMR Tier-2 is direct replacement for analog conventional radio.

• 4. This mode can use repeater to extend the radio coverage.

• 5. This mode is used for high power transmission devices.

So Tier 1 and Tier 2 radios actually should be able to talk to each other fine if you put them on the same frequency but because tier 1 radios are only able to work on the pmr446 frequencies you have to program your tier 2 radios to work on the same frequencies to be cable to talk to a tier 1 radio.