equisignal region

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equisignal — as at equiangular+ adjective Etymology: equi + signal : of or relating to a radio system used in navigation in which two distinguishable signals of different amplitude emitted by a radio range station merge and become indistinguishable when the… … Useful english dictionary
equisignal zone — A region in which equal signal strength is received from two intersecting lobes of radiation. The zone indicates a continuous on track signal … Aviation dictionary

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