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What is the frequency used by the localizer transmitter?

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What is the frequency used by the localizer transmitter?

(a) VHF

(b) UHF

(c) MF

(d) LF

This question was posed to me in semester exam.

The query is from ILS/MLS Coupled Landing System and Automatic Landing in division Autopilots and Flight Management Systems of Avionics

1 Answer

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Best answer
Correct answer is (a) VHF

Explanation: The localizer transmitter used VHF range from 108-122 MHz frequency and provides information to the aircraft as to whether it is flying to the left or right of the center line of the runway it is approaching. The localizer receiver output is proportional to the angular deviation γL, of the aircraft from the localizer beam center line which in turn corresponds to the center line of the runway.

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