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A German competitor on a 2-meter band ARDF course.
A German competitor on a 2-meter band ARDF course.
A member of the Republic of Korea national team sprints to the finish line of an eighty meter ARDF course.
A member of the Republic of Korea national team sprints to the finish line of an eighty meter ARDF course.
A transmitter, orienteering control flag, paper punch and electronic punch device at an ARDF control.
A transmitter, orienteering control flag, paper punch and electronic punch device at an ARDF control.
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Radiotriangulation scheme using two direction-finding antennas (A and B)
Radiotriangulation scheme using two direction-finding antennas (A and B)
Direction finding antenna near the city of Lucerne, Switzerland
Direction finding antenna near the city of Lucerne, Switzerland
W.G. Wade of the National Bureau of Standards uses a large multi-loop antenna to perform RDF in this 1919 photo. This is a fairly small unit for the e
W.G. Wade of the National Bureau of Standards uses a large multi-loop antenna to perform RDF in this 1919 photo. This is a fairly small unit for the era.
This Royal Navy model is typical of B–T goniometers. The two sets of "field coils" and the rotating "sense coil" are visible.
This Royal Navy model is typical of B–T goniometers. The two sets of "field coils" and the rotating "sense coil" are visible.