Abstract
THE radio direction-finder is an instrument for determining the direction of arrival of electric waves of the frequencies normally used in radio communication. Although it was introduced during the early years of the present century, it did not become a practically useful instrument until the valve-amplifying receiver was developed and provided the necessary sensitivity in the reception of radio signals. In its early form, the radio direction-finder, using closed loop aerials and operating on wave-lengths of from a few hundred to several thousand metres, was applied as an aid to marine navigation, and as a means of locating the position of unknown transmitting stations; in addition, however, the instrument provided a very useful tool in connexion with the study of the mode of propagation of electric waves.
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S.-R., R. The Recent Trend of Radio Direction-Finding. Nature 144, 139–140 (1939). https://doi.org/10.1038/144139a0
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DOI: https://doi.org/10.1038/144139a0