Discussion
Which transmitter architecture uses a phase modulator to produce FM?
Answer: A
Armstrong's indirect method integrates the audio, phase modulates a crystal-controlled carrier, and multiplies up to raise the small index, giving FM with crystal stability. The reactance modulator is the direct FM alternative, which pulls a free-running oscillator. A balanced modulator generates suppressed-carrier AM. And collector modulation is high-level amplitude modulation. The Armstrong chain is the clearest practical demonstration that the two angle schemes are interchangeable with the right pre-processing.
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