Radio direction finder

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Radio direction finder

  1. 1. ELECTRONIC NAVIGATION 1<br />2/M Crispin Echavez<br />instructor<br />
  2. 2. Navigational Equipments(RDF) Radio Direction Finder<br />
  3. 3. RADIO DIRECTION FINDER<br />
  4. 4. Radio direction finder (RDF)<br />device for finding the direction to a radio source.<br />Radio's ability to travel very long distances and "over the horizon“.<br />Good navigation system for ships, small boats, and aircraft that might be some distance from their destination.<br />
  5. 5. HISTORY<br />John Stone Stonein 1902<br />(U.S. Patent 716,134)<br />Lee de Forest in 1904 <br />(U.S. Patent 771,819)<br />EttoreBellini and Alessandro Tosi in 1909<br />(U.S. Patent 943,960)<br />Frank Adcock in 1919<br />(UK Patent 130,490)<br />The US Army Air Corps in 1931<br />
  6. 6. OPERATION<br />works by comparing the signal strength of a directional antenna pointing in different directions.<br />used by land and marine-based radio operators.<br />adopted for both ships and aircraft, <br />
  7. 7. OPERATION con’t<br />used in the 1930s and 1940s.<br />circular loops mounted above or below the fuselage.<br />enclosed in an aerodynamic, teardrop-shaped fairing.<br />employed large metal loop antennae, similar to aircraft<br />
  8. 8. OPERATION con’t<br />RDF operator would first tune the receiver to the correct frequency.<br />turn the loop.<br />long wave (LW)<br />medium wave (AM)<br />By taking bearings to two or more broadcast stations and plotting the intersecting bearings, the navigator could locate the relative position of his ship or aircraft.<br />
  9. 9. USAGE IN MARITIME NAVIGATION<br />Position fixing<br />
  10. 10. Also called Radio Compass.<br />radio receiver and directional antenna system used to determine the direction of the source of a signal. <br />It most often refers to a device used to check the position of a ship or aircraft, although it may also direct a craft’s course or be used for military or investigative purposes.<br />
  11. 11. Thanks for listening!<br />

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