# F.M., A.M. and S.S.B. transmitters

### Explanation of question 1

In frequency modulation, the deviation of the carrier is determined by the

1. frequency of the modulating signal
2. amplitude of the modulating signal
3. amplitude of the unmodulated carrier wave
4. audio bandwidth

The answer is :- 2 The modulating signal varies the frequency of the carrier. The modulated carrier frequency thus varies each side of its nominal unmodulated frequency. The magnitude of the variation (the frequency deviation) is a function of the amplitude of the modulating signal.

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