DMR was originally designed by ETSI for commercial applications. This is evident in the user interface where numbers are used in lieu of call signs. DMR modulates with 4FSK, indicating that it uses 4 frequencies (compared to D-Star with 2 frequencies). This allows to double the data rate to 9600 bit/s. The higher rate allows the transmission of 2 channels at the same time (2 time slots).
There are multiple DMR networks available:
The DMR Plus network is developed and operated by the DV4 team, the Brandmeister network by a team of Russian developers, the DMR-MARC network by the Motorola Amateur Radio Club, and others.
Local Repeater AB4NP
DMR: DMR Plus and bridge to MotoTRBO, transmit frequency of the DMR system is 444.975 MHz, RX frequency of the repeater is 449.975 MHz
CC=1, Timeslot 1 is connected to TG1 (worldwide) and to 262 (Germany).
Timeslot 2 is connected to TG4639 (USA nationwide) in DMR Plus.
Our (ARASWF) DMR Plus repeater AB4NP (Marbella) on TS1 (!!) as TG2 is connected to The Ft. Myers DMR-MARC repeater TG2 TS2 (local) and also connected to Charlotte’s DMR repeater.
PROGRAMMING DMR Radios
Programming any DMR radio can be a daunting task. Review the following for a basic introduction to programming the Hytera radio using the CPS software.