What two components constitute the Automatic Direction Finder?

What two components constitute the Automatic Direction Finder?

• A. A radar and a transmitter
• B. A GPS receiver and an antenna
• C. A directional antenna and a radio receiver
• D. A beacon receiver and a microphone

Answer: (C)

Automatic Direction Finder relies on two essential elements: a directional antenna and a radio receiver. The directional antenna, often a loop, has a pattern that changes with angle, letting the system determine from which direction the beacon’s signal is strongest. The radio receiver tunes to the beacon’s frequency and provides the demodulated signal to the bearing indicator, which translates that directional information into a readable bearing for the pilot. Without the directional antenna, you wouldn’t have a way to sense direction; without the receiver, there’s nothing to tune and process the beacon signal. The other options mix in equipment used for different systems or introduce components (like a microphone) that aren’t involved in bearing determination.

Automatic Direction Finder relies on two essential elements: a directional antenna and a radio receiver. The directional antenna, often a loop, has a pattern that changes with angle, letting the system determine from which direction the beacon’s signal is strongest. The radio receiver tunes to the beacon’s frequency and provides the demodulated signal to the bearing indicator, which translates that directional information into a readable bearing for the pilot. Without the directional antenna, you wouldn’t have a way to sense direction; without the receiver, there’s nothing to tune and process the beacon signal. The other options mix in equipment used for different systems or introduce components (like a microphone) that aren’t involved in bearing determination.