Portal:Radio

Radio is the technology of communicating using radio waves. Radio waves are electromagnetic wavesoffrequency 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. They are received by another antenna connected to a radio receiver. In addition to communication, radio is used for radar, radio navigation, remote control, remote sensing, and other applications.

Inradio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location to a receiver that is typically colocated with the transmitter. In radio navigation systems such as GPS and VOR, a mobile navigation instrument receives radio signals from multiple navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device. (Full article...)

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Aportable audio player is a personal mobile device that allows the user to listen to recorded audio while mobile. Sometimes a distinction is made between a portable player, battery-powered and with one or more small loudspeakers, and a personal player, listened to with earphones. (Full article...)

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WABC (AM) BBC Radio 2 Local BBC Radio Fred Allen John Peel Howard Stern Terry Wogan Radio spectrum Golden Age of Radio Electromagnetic spectrum Blue Network The Hitchhiker's Guide to the Galaxy (radio series) List of amateur radio frequency bands in India Mutual Broadcasting System Satellite radio Pirate radio in the United Kingdom National Recording Registry WJSV broadcast day WCBS-FM Disc jockey The Political Cesspool The War of the Worlds (1938 radio drama) A Prairie Home Companion Shortwave radio China Radio International Radio Havana Cuba Two-way radio Family Radio Service NBC Radio Network The Goon Show Wireless network Communications satellite Round the Horne Mechanical filter Flywheel, Shyster, and Flywheel Radar Airborne Interception radar AI Mk. IV radar 1988–1994 British broadcasting voice restrictions Digital radio in the United Kingdom Local marketing agreement Inverted-F antenna Smooth Radio (2010) The Quatermass Memoirs Shortwave listening Radio 1 Madonna controversy Power dividers and directional couplers Planet B Majestic Radios Mark Steel's in Town Alma Vessells John Neal Boortz Mary Dee The Museum of Curiosity Michael Savage Harold A. Lafount Harry Shearer Jane Withers Konnie Huq Bigipedia Tokyo Tower Steve Dahl The Quatermass Memoirs Radio receiver Citizens band radio Arecibo message Vintage amateur radio The Russell Brand Show prank calls row Boombox Talk radio Vehicle audio Portable media player iPod History of podcasting Personal stereo CD player MP3 blog Radio Hall of Fame Jukebox Dewey–Stassen debate Fireside chats Phonograph Simulcast Turntablism Rush Limbaugh

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  Image 1Radio communication. Information such as sound is converted by a transducer such as a microphone to an electrical signal, which modulates a radio wave produced by the transmitter. A receiver intercepts the radio wave and extracts the information-bearing modulation signal, which is converted back to a human usable form with another transducer such as a loudspeaker. (from Radio)
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  Image 2Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation. (from History of radio)
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  Image 3Volkswagen's RNS-510 receiver supports Sirius Satellite Radio. (from Radio)
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  Image 4Comparison of AM and FM modulated radio waves (from Radio)
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  Image 5Motorola SCR-536 from WW2, the first walkie-talkie (from Radio)
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  Image 6A laptop (with Wi-Fi module) and a typical home wireless router (on the right) connecting it to the Internet. The laptop shows its own photo (from Radio)
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  Image 7The first commercial AM Audion vacuum tube radio transmitter, built in 1914 by Lee De Forest who invented the Audion (triode) in 1906 (from History of radio)
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  Image 8Anantenna farm hosting various radio antennasonSandia Peak near Albuquerque, New Mexico, US (from Radio)
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  Image 9Animated diagram of a half-wave dipole antenna receiving a radio wave. The antenna consists of two metal rods connected to a receiver R. The electric field (E, green arrows) of the incoming wave pushes the electrons in the rods back and forth, charging the ends alternately positive (+) and negative (−). Since the length of the antenna is one half the wavelength of the wave, the oscillating field induces standing waves of voltage (V, represented by red band) and current in the rods. The oscillating currents (black arrows) flow down the transmission line and through the receiver (represented by the resistance R). (from Radio wave)
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  Image 10Around 1920, radio broadcasting started to get popular. The Brox Sisters, a popular singing group, gathered around the radio at the time. (from History of radio)
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  Image 11Early experiment demonstrating refraction of microwaves by a paraffin lens by John Ambrose Fleming in 1897 (from History of radio)
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  Image 12Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves. (from History of radio)
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  Image 13The Regency TR-1, which used Texas Instruments' NPN transistors, was the world's first commercially produced transistor radio in 1954. (from History of radio)
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  Image 14Reginald Fessenden (around 1906) (from History of radio)
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  Image 15British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897. (from History of radio)
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  Image 16Worldwide presence of Radio Maria broadcasters (from Radio broadcasting)
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  Image 17Animation of a half-wave dipole antenna radiating radio waves, showing the electric field lines. The antenna in the center is two vertical metal rods connected to a radio transmitter (not shown). The transmitter applies an alternating electric current to the rods, which charges them alternately positive (+) and negative (−). Loops of electric field leave the antenna and travel away at the speed of light; these are the radio waves. In this animation the action is shown slowed down tremendously. (from Radio wave)
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  Image 18Use of a sound broadcasting station (from Radio broadcasting)
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  Image 19Advertisement placed on November 5, 1919 in the Nieuwe Rotterdamsche Courant, announcing PCGG's debut broadcast scheduled for the next evening. (from Radio broadcasting)
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  Image 20In the 1920s, the United States government publication, "Construction and Operation of a Simple Homemade Radio Receiving Outfit", showed how almost any person handy with simple tools could a build an effective crystal radio receiver. (from History of radio)
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  Image 21An early iPhone with its GPS navigation app in use. (from Radio)
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  Image 22Frequency spectrum of a typical modulated AM or FM radio signal. It consists of a component C at the carrier wave frequency ${\displaystyle f_{c}}$ with the information (modulation) contained in two narrow bands of frequencies called sidebands (SB) just above and below the carrier frequency. (from Radio)
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  Image 23Diagram of the electric fields (E) and magnetic fields (H) of radio waves emitted by a monopole radio transmitting antenna (small dark vertical line in the center). The E and H fields are perpendicular, as implied by the phase diagram in the lower right. (from Radio wave)
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  Image 24Control room and radio studio of the Finnish broadcasting company Yleisradio (YLE) in the 1930s. (from Radio broadcasting)
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  Image 25Wildlife officer tracking radio-tagged mountain lion (from Radio)
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  Image 26Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
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  Image 27Rotating marine radar antenna on a ship (from Radio)
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  Image 28Neighborhood wireless WAN router on telephone pole (from Radio)

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• Radio December 12, 2006 "...to create, expand, and maintain Wikipedia articles related to radio, including radio propagation and reception, radio programming, radio personalities, and the business of radio." (Example: Mutual Broadcasting System)

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