radio direction finder
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Related to radio direction finder: Radio direction finding
radio direction finder[′rād·ē·ō di′rek·shən ‚fīn·dər]
A radio aid to navigation that uses a rotatable loop or other highly directional antenna arrangement to determine the direction of arrival of a radio signal. Abbreviated RDF. Also known as direction finder.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.