User manual

AP User Manual January 2004
Software Release 4.1
An unobstructed line of sight is important, but is not the only determinant of adequate placement.
Even where the path has a clear line of sight, obstructions such as terrain, vegetation, metal roofs,
or cars may penetrate the Fresnel zone and cause signal loss. Figure 15 illustrates an ideal
Fresnel zone.
Transmitter
or Amplifier
receiver
transmitter
Fresnel zone
Figure 15: Fresnel zone
The Canopy System Calculator page
FresnelZoneCalcPage.xls automatically calculates the
Fresnel zone clearance that is required between the visual line of sight and the top of a high-
elevation object in the link path. Figure 16 displays an image of this file.
Issue 5 Page 44 of 102