Discussion
Marker beacons transmit on
Answer: B
Correct answer: 75 MHz, radiating a narrow fan vertically
All marker beacons transmit on 75 MHz, radiating a narrow fan-shaped beam vertically so that the aircraft passes through it briefly overhead.
Because they share one frequency, the receiver needs no tuning at all and the markers are told apart by their modulation instead: the outer marker gives a low 400 hertz tone in dashes with a blue light, the middle an alternating 1300 hertz tone with an amber light, and the inner a rapid 3000 hertz tone with a white light. The narrow vertical pattern is what makes the passage a sharp position fix rather than a gradual indication.
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