The extension of wireless direction-finding techniques to very high frequencies for naval use

During the war the subject of radio direction-finding was intensively studied and expanded in many directions. One of the most fruitful fields of research was the extension of the methods already familiar in medium-frequency practice to the highest practicable limits of frequency, and the development of complementary techniques that would make accurate direction-finding possible up to the highest frequencies in current use. The apparatus developed was required to be suitable for naval sea-going conditions. These imply difficult siting conditions and considerable mechanical strength to withstand the effects of gun blast, vibration and swaying. The paper describes the methods adopted for the electrical design, and shows that satisfactory direction-finders can generally be developed for ship-board use in any frequency band.