Specifications

MDS 05-3438A01, Rev. E MDS 4790/9790 Series I/O Guide 99
Probability of System Fading
where:
FProb = probability of fading more than F
a
= terrain factor
• 4 is used for very smooth terrain, such as over water
• 1 is used for average terrain, with moderate roughness
• 0.25 is used for mountainous or very rough terrain
b = climate factor
• 0.5 is used for a hot, humid climate
• 0.25 is used for temperate or northern areas
• 0.125 is used for a very dry climate
ƒ = frequency in GHz
d = path length in km
F =fade margin in dB
FProb a b 6.0 10
7–
fd
3
10
F–()10⁄
××××××=