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58 - ATPL - What is measured in order to establish aircraft position in relation to the localiser beam on an ILS?

Question 58 - Radio Navigation - ATPL - Airline Transport Pilot license

The bearing to the localiser antenna found by means of a loop antenna.
The difference in phase between the 90 Hz modulation and the 150 Hz modulation.
The difference in time between the 90 Hz modulation and the 150 Hz modulation.
The difference in depth between the 90 Hz modulation and the 150 Hz modulation.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license