TC 9-64 _________________________________________________________________________
Optimum working frequency (FOT) is the most practical operating frequency
and the one that can be relied on to have the fewest problems.
Precipitation attenuation can be caused by rain, fog, snow, and hail, and can
affect overall communications considerably.
Temperature inversion causes channels, or ducts, of cool air to form between
layers of warm air, which can cause radio waves to travel far beyond the
normal line-of-sight distances.
Figure 2-Sum 12. Duct Effect Caused by Temperature Inversion
Tropospheric propagation uses the scattering principle to achieve beyond the
line-of-sight radio communications within the troposphere.
Figure 2-Sum 13. Tropospheric Scattering Propagation
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