Communications satellites
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U.S. military WGSS communications satellite A communications satellite (sometimes abbreviated to comsat) is an artificial satellite stationed in space for the purposes of telecommunications using radio at microwave frequencies. Most communications satellites use geosynchronous orbits or near-geostationary orbits, although some … Read More

Invention and history of radio
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Tesla demonstrating wireless transmissions during his high frequency and potential lecture of 1891. After continued research, Tesla presented the fundamentals of radio in 1893. The identity of the original inventor of radio, at the time called wireless telegraphy, is contentious. … Read More

Definition of the telecommunication
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Telecommunication is the extension of communication over a distance. In practice it also recognizes that something may be lost in the process; hence the term ‘telecommunication’ covers all forms of distance and/or conversion of the original communications, including radio, telegraphy, … Read More

Radio
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Radio is a technology that allows for the transmission of signals by modulation of electromagnetic waves. These waves travel (propagate) through the air and the vacuum of space equally well, not requiring a medium of transport. A radio wave is … Read More

Telegraphy
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Telegraphy is the long distance transmission of written messages without physical transport of letters. This definition includes recent forms of data transmission such as fax, email, and computer networks in general. (A telegraph is a machine for transmitting and receiving … Read More

Advertising media
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   Paying people to hold signs is one of the oldest forms of advertising, as with this Human directional pictured above Commercial advertising media can include wall paintings, billboards (outdoor advertising), street furniture components, printed flyers, radio, cinema and television … Read More