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129 - ATPL - The operation of the radio altimeter of a modern aircraft is based on:

Question 129 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

A combination of frequency modulation and pulse modulation.
Frequency modulation of the carrier wave.
Pulse modulation of the carrier wave.
Amplitude modulation of the carrier wave.

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