Discussion
On the localiser, the 150 hertz lobe predominates
Answer: A
Correct answer: To the right of the centreline as seen on approach
The localiser radiates two overlapping lobes, one modulated at 90 hertz and the other at 150 hertz. Seen from an aircraft on approach, the 150 hertz lobe predominates to the right of the centreline and the 90 hertz lobe to the left.
The receiver compares the depth of modulation of the two tones. Where they are equal the aircraft is on the centreline; where 150 hertz predominates the needle deflects to command a turn left, back towards the course. The same 90 and 150 hertz pair is used by the glide path, with 150 hertz predominating below the path.
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