Fire Service Communications Practice Test

A repeater extends coverage by creating a fresh radio link where the direct signal would be too weak or blocked. It sits at a location with good visibility to both the source area and the area in want of coverage. It listens for transmissions on the incoming frequency, then re-transmits the information at higher power (often on a different output frequency). This reception and retransmission effectively boosts the signal and bridges gaps caused by obstacles like buildings or terrain, letting radios in the obstructed area hear and speak to others as if they were closer together.

Storing emergency calls, converting analog to digital, or providing backup power are not the function of a repeater; those roles belong to other systems or devices.