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ADF Component
The ADF is the Automatic Direction Finder and is the cockpit instrument that displays relative direction to the pilot. Automatic direction finder instruments receive low and medium frequency radio waves from ground-based stations, including nondirectional beacons, instrument landing system beacons and can even receive commercial radio broadcast stations.
The ADF receives radio signals with two antennas: a loop antenna and a sense antenna. The loop antenna determines the strength of the signal it receives from the ground station to determine the direction of the station, and the sense antenna determines whether the aircraft is moving toward or away from the station.
