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

### Explanation of question 21

Multiband operation of an SSB transmitter is normally obtained by using

1. frequency multipliers
2. a VFO and mixer
3. a local oscillator
4. a class C power amplifier and tuning to the harmonics

The answer is :- 2 The output from the filter is mixed with the output from a v.f.o. Frequency multiplication is not used — it will multiply the width of the sideband, and a class C power amplifier will lead to distortion. A local oscillator is part of a superheterodyne receiver.

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