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

Question

Options

• AA Fade Margin is unnecessary on a long-distance RF link if more than 80% of the first Fresnel
• BThe Fade Margin is a measurement of signal loss through free space and is a function of
• CFade Margin is an additional pad of signal strength designed into the RF system to compensate
• DThe Fade Margin of a long-distance radio link should be equivalent to the receiver's low noise

• A
  3% (1)
• B
  3% (1)
• C
  88% (35)
• D
  8% (3)

Explanation

Fade Margin is an additional pad of signal strength designed into the RF system to compensate for unpredictable signal fading. It is the difference between the receiver's sensitivity and the actual received signal level. A higher Fade Margin indicates a more robust link that can withstand interference, attenuation, or other factors that may reduce the signal strength. A lower Fade Margin means that the link is more susceptible to failure or performance degradation. Fade Margin is usually expressed in decibels (dB) and can be calculated by subtracting the receiver sensitivity from the received signal level.

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