Nokia RoofTop R242 Installation Manual
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Contents
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Nokia RoofTop™ Wireless Routing Installation Guide 9Line of Sight Analysis2.3.2 Radio Line of SightProvide a clear radio path by raising the antenna as high as possible andaway from objects near the radio path. A radio wave is not like a laserwith a narrow, pointed beam. RF waves fan out from a single source andare diffracted or absorbed by objects that are near the visual line of sight.This area is called the Fresnel Zone. Clear radio line of sight exists whenthere are no physical obstructions in the Fresnel Zone.2.3.3 Fresnel ZoneElevate antennas as high as practical above physical obstacles to avoidobstructing the Fresnel Zone, the elliptical area adjacent to the path, thatcould reflect unwanted signals into the primary path and reduce signallevels. The Fresnel Zone must be considered when installing antennas.2.3.4 Antenna HeightAll antennas have a limited vertical radiation pattern. If nearby antennasare placed at different heights, verify that the vertical line of sight anglefalls within the antenna specifications for a good link.Fresnel Zone |
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