Which two elements constitute the Automatic Direction Finder?

Which two elements constitute the Automatic Direction Finder?

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

Answer: (D)

An Automatic Direction Finder relies on a directional antenna and a radio receiver to determine where a radio beacon is relative to the aircraft. The directional antenna provides directional sensitivity, allowing the system to “sense” from which direction the beacon’s signal is strongest (and often uses nulls or phase information to resolve bearing). The radio receiver tunes to the beacon’s frequency, demodulates the signal, and feeds the bearing information to the cockpit indicator so you can steer toward or locate the beacon. This setup does not involve GPS, a microphone, or radar components, which is why the other options don’t fit.

An Automatic Direction Finder relies on a directional antenna and a radio receiver to determine where a radio beacon is relative to the aircraft. The directional antenna provides directional sensitivity, allowing the system to “sense” from which direction the beacon’s signal is strongest (and often uses nulls or phase information to resolve bearing). The radio receiver tunes to the beacon’s frequency, demodulates the signal, and feeds the bearing information to the cockpit indicator so you can steer toward or locate the beacon. This setup does not involve GPS, a microphone, or radar components, which is why the other options don’t fit.