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What advantage does a higher intermediate frequency bring?

  • A.Lower local oscillator drift
  • B.Lower detector distortion
  • C.Better image rejection
  • D.Better adjacent-channel selectivity

Answer: C

A higher intermediate frequency pushes the image further from the wanted signal, so a simple preselector can reject it. The cost is that adjacent-channel selectivity becomes harder, since a filter of given fractional bandwidth is wider in absolute terms. That opposition is exactly why double-conversion receivers use a high first intermediate frequency and a low second one. Oscillator drift and detector distortion are not driven by the choice.

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