JOUR 001 Lecture Notes - Lecture 20: Wireless Telegraphy, Heinrich Hertz, Lee De Forest

• School: College of The Sequoias
• Department: Journalism (JOUR)
• Course: JOUR 001
• Professor: jones

Document Summary

Early pioneers turned telegraph technology into waves that carry the human voice. Alexander graham bell invented the telephone in 1876. Inventers were desperate to free these transmissions from the confines of wires. Heinrich hertz (1887) demonstrated that electronic currents could be sent via waves . Combined edisons electric power, hertz metal coil and morses telegraph technology to create a wireless telegraph system. Wireless telegraphy: name for early transmissions, before human voices could be carried on the airwaves. Reginald fessnden (1906) was the first to transmit the human voice. Lee de forest (1907): invented the audion. Audion: designed to pick up and amplify radio signals. When the u. s entered world war 1, the u. s navy declared a moratorium on patent lawsuits. As a hobby, began broadcasting news and music. Westinghouse became intrigued and used conrad to form kdka in 1920. In 1923 at&t forms weaf in new york. At&t also had the rights to conncect the signals between stations.