Technician 2022-2026T8D07
Which of the following describes DMR?
A
Answer
Signals, emissions, and modulation
Type
A
A technique for time-multiplexing two digital voice signals on a single 12.5 kHz repeater channel
B
An automatic position tracking mode for FM mobiles communicating through repeaters
C
An automatic computer logging technique for hands-off logging when communicating while operating a vehicle
D
A digital technique for transmitting on two repeater inputs simultaneously for automatic error correction
Answer Notes
Digital Mobile Radio (DMR) is a digital voice and data protocol widely used in amateur radio. Its standout feature is Time Division Multiple Access (TDMA), which divides a standard 12.5 kHz channel into two alternating time slots.
This time-multiplexing allows two separate conversations to occur simultaneously on a single repeater without interfering with one another. It essentially doubles the capacity of a standard radio channel.
The other options describe completely different technologies. For example, automatic position tracking refers to APRS, not DMR, and DMR does not involve transmitting on two repeater inputs simultaneously.
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