automatic direction finder
McGraw-Hill Science & Technology Dictionary:
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automatic direction finder
(¦öd·ə¦mad·ik di′rek·shən ′fīnd·ər)
(electronics) A direction finder that without manual manipulation indicates the direction of arrival of a radio signal. Abbreviated ADF. Also known as radio compass.
McGraw-Hill Dictionary of Aviation:
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automatic direction finder
Equipment to determine the direction from which an electromagnetic signal is being generated. It can either be airborne or ground-based equipment. It operates in medium or low frequencies, consists of basically a loop aerial, and gives the null position of the transmitter. To remove 180° ambiguity, a sense aerial is used. The commonest air-interpreted ADF is the one that utilizes a ground-based transmitting station called an NDB (nondirectional beacon).
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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