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Bridge Link Planning
3-2
This area is known as the first Fresnel Zone of the radio link. For
a radio link not to be affected by obstacles along its path, no
object, including the ground, must intrude within 60% of the first
Fresnel Zone.
The following figure illustrates the concept of a good radio
line-of-sight.
If there are obstacles in the radio path, there may still be a radio
link but the quality and strength of the signal will be affected.
Calculating the maximum clearance from objects on a path is
important as it directly affects the decision on antenna placement
and height. It is especially critical for long-distance links, where
the radio signal could easily be lost.
When planning the radio path for a wireless bridge link, consider
these factors:
• Avoid any partial line-of-sight between the antennas.
• Be cautious of trees or other foliage that may be near the path,
or may grow and obstruct the path.
Visual Line of Sight
Radio Line of Sight