The frequency of a FM transmitter without signal input is called
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C
In Frequency Modulation (FM), when there is no modulating signal input, the carrier transmits at its original unmodulated frequency. This frequency is called the resting frequency (or carrier frequency).
Lower Side Band (LSB) and Upper Side Band (USB) are terms mainly associated with AM, not FM.
Therefore, the frequency of an FM transmitter without signal input is the resting frequency.
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