radio direction finder
noun
a navigational aid establishing a fix by means of the bearings of two known radio stations. Abbreviation: RDF
Origin of radio direction finder
First recorded in 1920–25
Words nearby radio direction finder
radio beam,
radio car,
radio collar,
radio compass,
radio control,
radio direction finder,
radio free europe/radio liberty,
radio frequency,
radio galaxy,
radio horizon,
radio interferometer