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168
Earth bulge
For long links the curvature of the earth will may block the line of sight
path unless the antennas at both ends of the link are positioned high
enough above the ground. This height must be added to the FRESNEL
ZONE height for each antenna.
H
= D^2/8
E
H = Earth bulge height in feet
D=distance between antennas in miles
Case Study
D: 10 mile
H
= D^2/8 = 10^2/8 = 12.5 feet
E
Figure A.7
Earth Bulge
Total height required at midpoint
H
= H
T
Figure A.8
Total height
WLAN Cable Access Point 6220 CSU NTPM99CA Rel 2.0 Issue 5 Dec 2005
+ H
F
E
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