mountain effect

mountain effect

[′mau̇nt·ən i‚fekt]
(electromagnetism)
The effect of rough terrain on radio-wave propagation, causing reflections that produce errors in radio direction-finder indications.

mountain effect

An error in a radio direction finder caused by radio waves being reflected from the surface of a mountain, which may cause a direction-finding needle to fluctuate or give erroneous readings. The error is predominant when an aircraft is flying over mountains.
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