Final answer:
Receiver sensitivity for UHF FM receivers is usually expressed as a signal-to-noise ratio. FM receivers are particularly adept at rejecting noise due to their focus on frequency rather than amplitude changes, which allows them to provide a clearer signal.
Step-by-step explanation:
Receiver sensitivity for UHF FM receivers is often expressed as a signal-to-noise ratio (SNR). This metric is crucial as it determines how effectively the receiver can distinguish the desired signal from the background noise. FM receivers are designed to reject noise by focusing on variations in frequency rather than amplitude. FM radio inherently has an advantage in noise rejection compared to AM radio, because noise typically affects amplitude rather than frequency. Therefore, an FM receiver that is tuned to the carrier wave's frequency can isolate the desired signal, while ignoring other frequencies and amplitude variations that constitute noise.