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  2. Wireless telegraphy - Wikipedia

    en.wikipedia.org/wiki/Wireless_telegraphy

    Wireless telegraphy or radiotelegraphy is the transmission of text messages by radio waves, analogous to electrical telegraphy using cables. [1] [2] Before about 1910, the term wireless telegraphy was also used for other experimental technologies for transmitting telegraph signals without wires.

  3. Telegraphy - Wikipedia

    en.wikipedia.org/wiki/Telegraphy

    The electric telegraph was slower to develop in France due to the established optical telegraph system, but an electrical telegraph was put into use with a code compatible with the Chappe optical telegraph. The Morse system was adopted as the international standard in 1865, using a modified Morse code developed in Germany in 1848. [1] The ...

  4. Signal transmission - Wikipedia

    en.wikipedia.org/wiki/Signal_transmission

    In telecommunications, transmission (sometimes abbreviated as "TX") is the process of sending or propagating an analog or digital signal via a medium that is wired, wireless, or fiber-optic. [ 1 ] [ 2 ]

  5. Telecommunications engineering - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_engineering

    Telecommunications engineer working to maintain London's phone service during World War 2, in 1942. Telecommunications engineering is a subfield of electronics engineering which seeks to design and devise systems of communication at a distance.

  6. Radio - Wikipedia

    en.wikipedia.org/wiki/Radio

    Up until about 1910 the term wireless telegraphy also included a variety of other experimental systems for transmitting telegraph signals without wires, including electrostatic induction, electromagnetic induction and aquatic and earth conduction, so there was a need for a more precise term referring exclusively to electromagnetic radiation ...

  7. Communications and information systems of the British Armed ...

    en.wikipedia.org/wiki/Communications_and...

    The Plessey Company, subsequently Siemens Plessey Systems and then a constituent part of BAE Systemsm was appointed prime contractor and system design authority for Ptarmigan in 1973, with responsibility for engineering development of the complete system. The initial development programme was followed by a series of production contracts worth ...

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  9. Wireless - Wikipedia

    en.wikipedia.org/wiki/Wireless

    Wireless communication (or just wireless, when the context allows) is the transfer of information (telecommunication) between two or more points without the use of an electrical conductor, optical fiber or other continuous guided medium for the transfer.