Wilan VIP 110-24, Operator'S Manual

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VIP 110-24 Operator’s Manual (rev E)
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Figure 4-1. Antenna Height and Radio Horizon Graph
If the radio horizon is well within maximum communication range of the system, this graph provides
a reasonable guide for antenna height. However, as maximum range of the system is approached,
results are less reliable because of atmospheric effects and other unpredictable phenomena. In such
cases, the more thorough point-to-point path analysis described in the next section should provide
more reliable results.
4.3.3 Point-to-Point Path Analysis
A full point to point analysis should consist of at a minimum, a background noise evaluation of all
locations where radios are to be installed, a determination of the minimum antenna height required to
obtain a “line-of-sight”, and a calculation of the expected RSS level to be received at each of the
locations. The background noise measurement is critical as it gives the operator a preview of the
potential performance variations and the feasibility of utilizing a particular radio at a location. For
example, if the background noise is found to be at the same level as the radio sensitivity (when set to