Ham Amateur Radio Technician Practice Exam 2026 - Free Technician Practice Questions and Study Guide

Question: 1 / 470

What is the frequency above which a low-pass filter's output power is less than half the input power?

Roll-off frequency

Cutoff frequency

The correct answer is the cutoff frequency. In the context of a low-pass filter, the cutoff frequency is defined as the frequency at which the output power falls to half of the input power, which corresponds to a decrease in voltage to approximately 70.7% of the maximum voltage. This point signifies the transition from the passband, where signals are allowed to pass through with minimal attenuation, to the stopband, where signals are significantly attenuated.

Understanding this concept is essential for anyone working with filters in various audio and radio frequency applications, as the cutoff frequency effectively determines the filter's performance and the range of frequencies that it can effectively handle. Knowing where this frequency lies helps radio operators and engineers design circuits that operate within desired frequency ranges while minimizing interference from unwanted signals.

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Resonant frequency

Passband frequency

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