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 ... [1 related articles]
[n] - radio
(DF) Radio apparatus the function of which is to determine the bearing of a distant radio transmitter.
A device used to find the location of a wireless-transmitting station. Initially developed by Bellini and Tosi in 1907, the sets were later developed by the Marconi Company and were used by both sides during WWI. The sets took advantage of improved receiving equipment technology and directional characteristics of the loop antenna to discover the d...
noun radio; determines the direction of incoming radio waves
a receiver with a loop antenna rotating on a vertical axis, used to ascertain the direction of incoming radio waves.