What device is used to extend the range of radio communications?

The device that is used to extend the range of radio communications is a repeater. A repeater receives a radio signal and then retransmits it at a higher power level or on a different frequency, thereby increasing the distance over which the original signal can be transmitted and received. This is particularly useful in scenarios where direct communication between two points is impeded by distance, terrain, or obstacles that block radio waves.

A transmitter is responsible for generating the radio signal, while a receiver captures and processes the signal. An amplifier boosts the strength of an incoming signal but does not retransmit it, which differentiates it from the function of a repeater. The purpose of the repeater specifically focuses on extending the range of communication, making it a crucial component in various radio communication systems, especially in public safety and emergency response scenarios.