RADIO ALTIMETERS

The operation of the radio altimeter of a modern aircraft is based on?

• APulse modulation of the carrier wave.
• BA combination of frequency modulation and pulse modulation.
• CFrequency modulation of the carrier wave.
• DAmplitude modulation of the carrier wave.

Modern low altitude radio altimeters emit waves in the following frequency band?

• AHF (High Frequency).
• BUHF (Ultra High Frequency).
• CSHF (Super High Frequency).
• DVLF (Very Low Frequency).

During the approach, a crew reads on the radio altimeter the value of 650 ft. This is an Indication of the true?

• AHeight of the lowest wheels with regard to the ground at any time.
• BHeight of the aircraft with regard to the ground at any time.
• CHeight of the aircraft with regard to the runway.
• DAltitude of the aircraft.