The center (rest) frequency on an FM transmitter refers to which type of carrier frequency?

The center (rest) frequency on an FM transmitter refers to the unmodulated carrier frequency. This is the frequency at which the transmitter operates when no modulation signal is present. In the case of frequency modulation (FM), the carrier frequency is the baseline around which the transmitted signal varies as audio or other modulation signals are applied.

This unmodulated carrier frequency serves as a reference point, and any variations in frequency due to modulation produce the actual broadcast signal that carries the information (such as voice or music). Understanding the role of the unmodulated carrier frequency is essential in grasping how FM transmission works, as it sets the foundation for how modulation alters the signal transmitted over the airwaves.