one-hundred-and-eighty-degree ambiguity

An error in some radio direction finders in which equipment cannot discern whether a signal is being received from ahead of or behind the aircraft. Automatic direction finders do not have this problem.
Beacon’s position can be either at A or B. This ambiguity can be removed by superimposing polar diagram of selysn aerial on the loop aerial.

Aviation dictionary. 2014.

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