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The instrument landing system deviation signal is formed from

  • A.The phase difference between two carriers
  • B.The time difference between two pulses
  • C.The amplitude of a single tone
  • D.The difference in depth of modulation between two tones

Answer: D

Two lobes are modulated at 90 and 150 hertz, and equal depth means the aircraft is on course. The receiver measures the difference in depth of modulation and drives the deviation indicator from it. Signal strength does not affect it.

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