FM systems utilizing a direct FM modulator with an automatic frequency control (AFC) are known as:
A) PLL systems
B) Crosby systems
C) Armstrong systems
D) Hartley systems

Name: FM systems utilizing a direct FM modulator with an automatic frequency control (AFC) are known as: A) PLL systems B) Crosby systems C) Armstrong systems D) Hartley systems
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Quizplus · Accepted Answer

Crosby systems use a direct FM modulator with automatic frequency control (AFC) to stabilize the frequency.

FM Systems Utilizing a Direct FM Modulator with an Automatic