ADF reversal

ADF reversal

[¦ā¦dē¦ef ri′vər·səl]
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The swinging of the needle on the direction indicator of an airborne automatic direction finder (ADF) through 180°, indicating that the station to which the direction finder is tuned has been passed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.