An Introduction to Radio Direction Finding

Humans do audio direction finding to a remarkable precision of less than two degrees. Shortly after the development of radio transmitters and receivers, radio direction finding (RDF or just DF) evolved for much the same reasons as human audio direction finding: firstly, for the location
of possible threads and secondly for spatial awareness.
RF direction finding is used in a number of applications:
1. Military: such as the direction of a thread, the location and movement of enemy transmitters
and the direction of enemy jammers.
2. Search and Rescue: the location of RF search and rescue beacons.
3. Science: the tracking of animals in their environment.
4. Radio monitoring: the location of sources of interference and of illicit transmitters

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