FCC Question Pool Review

Amateur Extra Class (Element 4) • 2024-2028

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Question E7H03

From subelement E7 - E7H

E7H03
Answer: C

What is a phase-locked loop?

AAn electronic servo loop consisting of a ratio detector, reactance modulator, and voltage-controlled oscillator
BAn electronic circuit also known as a monostable multivibrator
CAn electronic servo loop consisting of a phase detector, a low-pass filter, a voltage-controlled oscillator, and a stable reference oscillator
DAn electronic circuit consisting of a precision push-pull amplifier with a differential phase input