Hytera DMR System Planner
119
4.1.1 Back-to-Back Mobile Radio Application in Direct
Mode
The “back-to-back” is a system solution on accessory pins. It is used to achieve
cross-band communication among analog and digital radios.
The back-to-back function realizes communication between analog and digital
mobile radios. It works as below:
1. When the radio R1 transmits, the radio R2, R3 and the mobile radio 1 will receive
the signals from R1 simultaneously.
2. During retransmitting, the mobile radio 1 will output the audio signals to the
mobile radio 2 via accessory pin and activate its Mic PTT, triggering the mobile radio
2 to transmit. This operation is not subject to the working mode and frequency of two
mobile radios.
3. The radios R4, R5 and R6 receive the same audio signals from mobile radio 2,
and this signal is the same as that one from the mobile radio 1. In this way, R1 can
communicate with R2, R3, R4, R5 and R6 successfully.
4. The mobile radio 2 can also output the audio signal to mobile radio 1 via
accessory pin, enabling all radios within the coverage of two mobile radios to
communicate with each other.
Figure 4.1.1-1 Back-to-Back Mobile Radio in Direct Mode
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