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

### Explanation of question 12

A modulation factor (modulation depth) greater than unity in an AM transmitter is

1. desirable- it indicates maximum output power is achieved
2. desirable- it indicates sufficient audio from the microphone
3. undesirable- it indicates a too large deviation of the carrier frequency
4. undesirable- it indicates possible distortion

The answer is :- 4 Modulation factor is a per unit value, used instead of percentage modulation, i.e. 100% modulation is the same as a modulation factor of 1. Greater values than unity will cause breaking of the carrier, the effect of which is to cause distortion.

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