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Which of these is not a property shared by FM and PM?

  • A.An infinite sideband series
  • B.Immunity to amplitude noise after limiting
  • C.A frequency-independent index
  • D.A constant envelope

Answer: C

A frequency-independent index belongs to PM alone; FM's index falls as the message frequency rises. The other three are shared and are what make the two schemes one family. Framing the question as what is not shared is a useful check on whether the family resemblance has been learned along with the one distinction, since most errors on this topic come from over-generalising in one direction or the other. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.

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