TDMA: How It Works
DMR, which stands for Digital Mobile Radio, uses TDMA digital technology. TDMA stands for “Time-Division Multiple Access.” Like FDMA, or “Frequency-Division Multiple Access,” TDMA is a technology that allows multiple conversations to share the same radio frequency. Although the goal is the same, the two technologies work very differently.
Since TDMA transmits timed pulses, two different conversations can occur on the same frequency simply by transmitting at alternating pulses or “time slots”.

Other cool benefits of a “pulsed” signal is that it is not continuously transmitting like an analog signal or FDMA is therefore increasing your battery life. Usable range is also increased as well as the audio quality.

Two voice conversations at the same time on the same frequency

Time slot 1 – conversation 1
Time slot 2 – conversation 2
Both occur on the same frequency at the same time
The DMR network is an all-digital group of over 500 DMR-MARC repeaters in 41 countries with 13300 registered users. There are 1373 registered DMR repeaters world-wide in the database and we are all amateur radio operators.  

Sign up and join us on DMR!
1 – click here to sign up and receive your personal DMR user ID number.
2 – Click here to become a member of our site. We can help you with programming your radio. You will also have access to the online resources here.
3 – If you have any questions, you can email us at or click here to fill out a contact form:

Here is some additional useful DMR Information:
Here is the Brandmeister Dashboard Facebook Page:
bm_logo This is the main Brandmeister website with valuable information on DMR:

— To use the DMR network, all you need to do is go here to register for free and you will be emailed a user ID number:

Here is a downloadable user guide:


Other Useful DMR Tools:

overview-portables To listen to the Brandmeister Network on your computer:
To see the list of repeaters on the Brandmesiter network:
Last Heard on the Brandmeister DMR Network: