Question

What is the frequency of marker beacon transmission?

(a) 100 MHz

(b) 75 MHz

(c) 1 GHz

(d) 1000 MHz

This question was addressed to me in an interview.

I would like to ask this question from ILS/MLS Coupled Landing System and Automatic Landing topic in portion Autopilots and Flight Management Systems of Avionics

Answer 1

The correct answer is (b) 75 MHz

The explanation: The marker beacon transmissions are at 75 MHz. The middle marker beacon is located at a distance of between 1,000 and 2,000 m from the runway threshold and the outer marker beacon is situated at a distance of between 4,500 and 7,500 m from the middle marker.