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1898 __ Patent 7777
Guglielmo Marconi (1874-1937)
Comment : Guglielmo Marconi constructs equipments with tuning circuits to secure the independence of simultaneous radio communications between more stations (the future and famous patent 7777). (Brunero, Angelo and Andrea Valori. 2001, “The invention of the radio”)On March 27, 1899, Marconi joined England to Europe with wireless telegraphy between his shore station at South Foreland Light and a station he built at Wimereux, 50 kilometers across the Channel. He was nearly in a position to compete with submarine telegraph cables across the Dover Strait that had been operating since 1851. The notion of competing with telegraph companies was obvious. By the summer of 1899, Marconi had finally waited out and overridden political obstacles in the Royal Navy and was invited to place his wireless on three naval ships during maneuvers. The range to his shore station ran as far as 160 kilometers, while ships could signal each other as far as 110 kilometers and occasionally as far as 136 kilometers. By this point, interference was becoming intolerable with no real tuning or band-limiting of emissions. Marconi had to get to work on employing some "syntony," which Lodge had patented in 1897. Marconi took "syntony" a step farther than Lodge, providing tuning at both the spark transmitter and the coherer receiver as part of his famous Patent 7777. This did not keep Lodge from later suing Marconi in 1910 and settling for cash in 1911 over patent infringements. (Don Kimberlin, “Jurassic Telecommunications, Part II, The Global Influences Leading Up To Marconi's "Lucky 7's" Patent”, published in NARTE News, Volume 17 Number 3, October, 1999)
Urls : http://www.mhs.ox.ac.uk/marconi/exhibition/7777.htm (last visited ) http://www.oldradio.com/archives/jurassic/dk-marconi.htm (last visited )

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