American Heritage® Dictionary of the English Language, Fourth Edition
- n. A device for determining the source of a transmitted signal, consisting mainly of a radio receiver and a coiled rotating antenna.
- n. radio; determines the direction of incoming radio waves
“Station CAST obtained a radio direction finder bearing on a Yamamoto radio call sign of YO WI ØØ on December 2.”
“Between 8:05 A.M. and noon, Station H radio operators and direction finder experts intercepted radio dispatches that clearly placed the First Air Fleet north of Oahu.”
“For the radio direction finder intercept of the Akagi using the radio call sign of 8 YU NA, see Station KING, monthly report for November 1941 in RG 181, Commandant 13th Naval District, Secret A-6 files, NA, Seattle, WA, copy author’s file.”
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