User's Manual

Figure 10-10: Rain Attenuation
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for 5 GHz band (ITU-R P.721-3).
Figure 10-10shows that the Rain Attenuation for the 5 GHz band is really about 1
dB at the very worst rain storm (150 mm/hr), which is a cloudburst, or worse. So
Rain Attenuation for this band is really small compared to cable losses, losses
due to connectors, etc.
10.8 Lightning Strikes
Obviously some regions have more frequent lightning strikes than others. One
map of the US is shown in Figure 10-11, also see IEEE 1410 Guide
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.
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ITU-R P.721-3 has been superceded by complex computer modeling, but this figure is still the
easiest to visualize the effects of rain.
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IEEE P1410, Guide for Improving the Lightning Performance of Electric Power Overhead
Distribution Lines, draft 3, feb 2003.
ARCXtend manual, August 2003 10-11