What does the scanning function of an FM transceiver do?

The scanning function on a modern transceiver automates the process of listening for active signals. It rapidly steps through a pre-programmed list of memory channels or sweeps across a specific frequency band. When it detects a signal strong enough to open the squelch, the scan pauses so you can listen to the transmission. This feature is incredibly useful for monitoring multiple local repeaters or simplex calling frequencies without manually turning the dial. It does not measure signal deviation or check antenna resonance, as those tasks require entirely different test equipment like a deviation meter or an antenna analyzer.