In RF antenna systems, what is a goniometer?

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Study for the Pilot's Handbook of Aeronautical Knowledge Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

In RF antenna systems, what is a goniometer?

Explanation:
A goniometer is a direction-finding instrument in RF antenna systems. It uses two fixed loops oriented 90° apart to sense the strength of the received RF field along two orthogonal axes. By rotating the assembly (driving the rotors) until the received signal is nulled (minimized), the system can determine the direction from which the signal is coming, since the bearing corresponds to the orientation where the fields cancel. The setup often emphasizes minimizing the influence of the rotor’s own magnetic effects to keep the readings accurate.

A goniometer is a direction-finding instrument in RF antenna systems. It uses two fixed loops oriented 90° apart to sense the strength of the received RF field along two orthogonal axes. By rotating the assembly (driving the rotors) until the received signal is nulled (minimized), the system can determine the direction from which the signal is coming, since the bearing corresponds to the orientation where the fields cancel. The setup often emphasizes minimizing the influence of the rotor’s own magnetic effects to keep the readings accurate.

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