Discussion
What is selective fading, and why does it trouble AM particularly?
Answer: C
Selective fading attenuates the carrier and the two sidebands by different amounts, and because AM's envelope depends on their relative magnitudes, the recovered audio distorts badly even when the total signal is strong. Uniform fading merely changes the level and is handled by the gain control. Audio-frequency selectivity is not what fading means. And the gain control responds to fading rather than causing it. Single sideband is less affected, which is one of its practical advantages on long paths.
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