How does a repeater differ from a simple transmitter in terms of functionality and coverage?

• A. A repeater receives on one frequency and retransmits on another, extending coverage, often with receiver and transmitter synchronized to avoid interference
• B. It transmits on the same frequency as received but at higher power
• C. It uses inverted phase to cancel interference
• D. It is a dedicated receiver with no transmit capability

Answer: (D)

A repeater works as a relay: it hears a signal on one channel and immediately re-transmits it on a second channel. This two‑frequency operation, often with a fixed offset and a duplexing arrangement, lets the signal cover areas beyond what a single transmitter could reach. The receiver and transmitter are coordinated to avoid transmitting while listening, which prevents interference and keeps the link clear.

That’s why the best description is that it receives on one frequency and retransmits on another, extending coverage through this two‑way path. Transmitting on the same frequency at higher power doesn’t create the same extended, reliable coverage and risks interference; using inverted phase isn’t how repeaters operate; and a dedicated receiver with no transmit capability wouldn’t relay messages at all.