direction-finder

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

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