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direction finder

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

First recorded in 1910–15
Related formsdirection finding, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for direction finder

direction finder

noun
  1. a highly directional aerial system that can be used to determine the direction of incoming radio signals, used esp as a navigation aidAbbreviation: D/F, DF
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Derived Formsdirection finding, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012