Video URL


13182_27799_radio_technology2
Subjects

1940s
B&W

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.Animation diagrams explaining the directions of magnetic fields.Animation diagrams show how high frequency generator creates magnetic fields. The velocity is 186,000 miles per second.