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    Wikipedia
    https://en.wikipedia.org › wiki › Wireless_telegraphy

    Wireless telegraphy - Wikipedia

    • Wireless telegraphy or radiotelegraphy, commonly called CW (continuous wave), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method. It was transmitted by several different modulation methods during its history. T… See more

    Overview

    Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to
    Radiotelegraphy … See more

    History

    Efforts to find a way to transmit telegraph signals without wires grew out of the success of electric telegraph networks, the first instant telecommunication systems. Developed beginning in the 1830s, a telegraph line was … See more

    Methods

    The primitive spark-gap transmitters used until 1920 transmitted by a modulation method called damped wave. As long as the telegraph key was pressed, the transmitter would produce a string of transient p… See more

    Industry

    The International Radiotelegraph Union was unofficially established at the first International Radiotelegraph Convention in 1906, and was merged into the International Telecommunication Union in 1932. When the United … See more

    Regulation

    Continuous wave (CW) radiotelegraphy is regulated by the International Telecommunication Union (ITU) as emission type A1A.
    The US Federal Communications Commission issues … See more

    Gallery

    • Guglielmo Marconi, generally credited as first to develop practical radio-based wireless telegraphy communication, in 1901 with one of his first transmitters (right) and receivers (left)
    • 24 September 1900: Ferdinand … See more

    See also

    • AT&T Corporation originally American Telephone and Telegraph Company
    • Electrical telegraph
    • Imperial Wireless Chain… See more

    Wikipedia text under CC-BY-SA license

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