Radio - Wikipedia
WebRadio is the technology of communicating using radio waves. [1] [2] [3] Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves.
History of radio - Wikipedia
WebIn early radio, and to a limited extent much later, the transmission signal of the radio station was specified in meters, referring to the wavelength, the length of the radio wave. This is the origin of the terms long wave, medium wave, and short wave radio.
Invention of radio - Wikipedia
WebIn 1900, construction began on a large radio transmitting alternator. Fessenden, experimenting with a high-frequency spark transmitter, successfully transmitted speech on 23 December 1900, over a distance of about 1.6 kilometres (0.99 mi), the …
Radio propagation - Wikipedia
WebSeveral different types of propagation are used in practical radio transmission systems. Line-of-sight propagation means radio waves which travel in a straight line from the transmitting antenna to the receiving antenna.
Transmitter - Wikipedia
WebIn electronics and telecommunications, a radio transmitter or just transmitter (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna with the purpose of signal transmission up to …
Signal transmission - Wikipedia
WebSignal transmission. Antenna used for transmission of radio signals. In telecommunications, transmission is the process of sending or propagating an analog or digital signal via a medium that is wired, wireless, or fiber-optic.
Radio broadcasting - Wikipedia
WebRadio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio station, while in satellite radio the radio waves are broadcast by a satellite in Earth orbit.
Radio | Definition, History, & Facts | Britannica
WebRadio, sound communication by radio waves, usually through the transmission of music, news, and other types of programs from single broadcast stations to multitudes of individual listeners equipped with radio receivers. Learn more about the history of radio in this article.
Radio - New World Encyclopedia
WebRadio, once known as "wireless telegraphy" or "radiotelegraphy," is the wireless communication of signals by transmitting electromagnetic waves at "radio frequencies"—that is, at frequencies lying below the visible and infrared regions of the electromagnetic spectrum.
Radio - Simple English Wikipedia, the free encyclopedia
WebRadio is a way to send electromagnetic signals over a long distance, to deliver information from one place to another. A machine that sends radio waves is called a transmitter, while a machine that "picks up" the signals is called a receiver or antenna. A machine that does both jobs is a "transceiver".
Skip to content