ARRL Technician Practice Exam

Which of the following methods is used to locate sources of noise interference or jamming?

1. Phase Shift Keying

2. Radio direction finding

3. Time Division Multiplexing

4. Signal Attenuation

The correct answer is: Radio direction finding

The method used to locate sources of noise interference or jamming is radio direction finding. This technique involves measuring the direction from which a received signal is coming. By taking measurements from multiple locations and angles, it is possible to triangulate the source of the interference. Radio direction finding utilizes specialized equipment, including directional antennas and receivers that can determine the angle of arrival of incoming signals. In this context, other methods like phase shift keying, time division multiplexing, and signal attenuation relate to different aspects of radio transmission and signal processing. Phase shift keying is a modulation technique, time division multiplexing is a way of sharing a communication medium among multiple signals, and signal attenuation generally refers to the reduction in signal strength as it propagates over distance, none of which directly address the problem of locating interference sources.