direction finder

noun Radio.
a receiver with a loop antenna rotating on a vertical axis, used to ascertain the direction of incoming radio waves.

Origin:
1910–15

direction finding, noun
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World English Dictionary
direction finder
 
n
D/F, Abbreviation: DF a highly directional aerial system that can be used to determine the direction of incoming radio signals, used esp as a navigation aid
 
direction finding
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

direction finder

radio receiver and antenna system for determining the direction of the source of a radio signal. A direction finder (DF) can be used by an aircraft or ship as a navigational aid. This is accomplished by measuring the direction (bearing) of at least two transmitters whose locations are already known. When the measured directions from each transmitter are plotted on a map, the intersection of the two plotted lines gives the location of the aircraft or ship carrying the DF. This technique, using the directions to two or more transmitters of known location, is called triangulation.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
If an interference complaint is received, the direction finder can be used to locate an interfering transmitter.
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