Radio AntennasThe Creation and Behavior of RADIO WAVES

Duration:

Year Published: 1940

Creator: The Signal Corps

Complete Record: Explains electric and magnetic fields, generation of electro-magnetic waves, behavior of radio waves in space, ground wave, reflection and refraction, the ionosphere, and causes of fading. Wide angle tilting up shots of antennas and then some close-up shots of antennas. One hand holds a compass measuring the magnets. Animation diagrams explaining the directions of magnetic fields. One hand holds a metal bar testing the magnetic effects. Animation diagrams show how the battery creates magnetic fields. Animation diagrams show how high frequency generator creates magnetic fields. The velocity is 186,000 miles per second. Animation diagrams show the distance of wave length. Radio Waves in Space A shot with antenna and animation diagrams of radio waves heading towards different directions. Animation diagrams with an antenna on the earth surface with ionosphere up in the sky. Animation diagrams of radio waves heading towards ionosphere. A pan tilting up shots with an antenna. Animation diagrams with an antenna on the earth surface with ground wave. Animation diagrams with an antenna on the earth surface show the skip distance between ionosphere wave and ground wave. The United Stated map. Kansas city, Denver, St. Louis and Cincinnati are marked. The zone of silence are pointed. Animation diagrams with an antenna on the earth surface with ionosphere in the iced area. Animation diagrams show the interactions of different radio waves. Wide angle tilting up shots of an antenna. Wide angle shots of a building. Wide angle shots of an army airplane. A man is talking on the radio communication in a control tower.