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Marconi built the first complete commercially successful wireless telegraphy system based on airborne hertzian waves
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In 1906, Alexander Lee de Forest modified the diode invented in 1904 by John Fleming adding a third electrode
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On Christmas Eve of 1906, using the heterodyne principle, Reginald Aubrey Fessenden broadcast from Brant Rock Station (Massachusetts) the first audio broadcast in history
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In 1912 the first public radio podcast are given to all people with a radio
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In 1922, in England the station of Chelmsford, belonging to the Marconi Wireless, broadcast two daily programs, one on music and the other on information.
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In 1922 to be publicity on the radio that started generating the money to the radio station, years later it is very difficult to put their advertising on the radio and that it has a high demand of money
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In some places Tesla is attributed the invention of the radio indicating that it was stealed by Marconi and citing a decision of the Supreme Court of EE. UU of 1943
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In 1990, new digital technologies began to be applied to the world of radio. This increases the quality of the sound and tests are done with the satellite radio (also called HD radio), this technology allows the resurgence in the interest for the radio.
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Since 1994 In spain 4.089 million people listen to the SER every day, which is 25 consecutive years as the leader of broadcasting in Spain
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World Radio Day. World Radio Day was created at the 36th session of the General Conference of UNESCO in 2011 and is celebrated every February 13
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-Learn more about radio
https://en.wikipedia.org/wiki/Invention_of_radio
-Documentary film about radio
https://www.youtube.com/watch?v=9PJElJA24pQ
-How to make a FM radio?
https://www.youtube.com/watch?v=9PJElJA24pQ
-Differences between AM and FM
https://www.pbs.org/wgbh/aso/tryit/radio/radiorelayer.html
-History of the invenor of the radio
https://es.wikipedia.org/wiki/Guillermo_Marconi -
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