Discussion
What does the Armstrong method use to reach broadcast deviation?
Answer: D
Multiplication scales the small phase deviation a linear phase modulator can produce up to the seventy-five kilohertz broadcasting needs, taking the carrier frequency with it. A bigger varactor belongs to the direct method. More audio would simply drive the phase modulator into its nonlinear region. And filters do not create deviation. The chain exists because the modulator's linear range and the required deviation differ by a large factor. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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