JL MC 101 Lecture Notes - Lecture 4: Wireless Telegraphy, Inker, Frank Conrad
15 Dec 2016
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Chapter 5: popular radio and the origins of broadcasting. In the late 1990s and early 2000s, clear channel communications cut jobs at local radio stations across the us. In 2014, clear channel rebranded itself as iheartmedia, a streaming radio network, in an effort to create a more friendly public image. James maxwell: theorized the existence of electromagnetic waves (1860s) Believed a portion of these waves, later known as radio waves, could be harnessed to transmit signals. Guglielmo marconi: received a patent on wireless telegraphy in england in 1896, used he(cid:396)tz"s spa(cid:396)k-gap transmitter connected to morse telegraph key that transmitted to a more inker. Invented a wireless system in 1892: marconi used (cid:373)u(cid:272)h of tesla"s (cid:449)o(cid:396)k, deemed inventor of radio. Lee de forest: wrote the first ph. d. thesis on wireless technology in 1899, primary interest was wireless telephony, biggest breakthrough was the development of the audion vacuum tube. Radio act of 1912: required licensing, adopted the sos distress signal.
