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what statement about Fade Margin is true?

In a long-distance RF link, what statement about Fade Margin is true?

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A.
Fade Margin is an additional pad of signal strength designed into the RF system to compensate
for unpredictable signal fading.

B.
The Fade Margin of a long-distance radio link should be equivalent to the receiver’s antenna
gain.

C.
A Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel
zone is clear of obstructions.

D.
The Fade Margin is a measurement of signal loss through free space, and is a function of
frequency and distance.

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