TX/RX mode Simplex

New users must post here first and let us know a little bit about yourself.
Post Reply
G4EML
Posts: 919
Joined: Sat Nov 16, 2019 10:01 am

Re: TX/RX mode Simplex

Post by G4EML » Fri Nov 04, 2022 1:57 pm

DMR actually has several sub modes which are not compatible with each other. The transmissions are slightly different, with different synchronisation words and timing requirements.
When operation through a repeater the radio uses the RMO mode, when operating simplex the radio uses the DMO mode (D= Direct) .

Most DMR radios select DMO when set to simplex and RMO when set to duplex. A radio set to Simplex (DMO) will not hear a repeater sending RMO.

OpenGD77 has special code to automatically detect the received signal and switch to the correct mode.

Colin G4EML

Post Reply