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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