In radio 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...)
Sir Michael Terence WoganKBEDL (/ˈwoʊɡən/; 3 August 1938 – 31 January 2016) was an Irish-British radio and television broadcaster who worked for the BBC in the UK for most of his career. Between 1993 and his semi-retirement in December 2009, his BBC Radio 2 weekday breakfast programme Wake Up to Wogan regularly drew an estimated eight million listeners. He was believed to be the most listened-to radio broadcaster in Europe.
Wogan was a leading media personality in Ireland and Britain from the late 1960s, and was often referred to as a "national treasure". In addition to his weekday radio show, he was known for his work on television, including the BBC One chat show Wogan, presenting Children in Need, the game show Blankety Blank and Come Dancing. He was the BBC's commentator for the Eurovision Song Contest from 1971 to 2008 (radio: 1971, 1974–1977; television: 1973, 1978, 1980–2008) and the Contest's co-host in 1998. From 2010 to 2015 he presented Weekend Wogan, a two-hour Sunday morning show on BBC Radio 2. (Full article...)
The following are images from various radio-related articles on Wikipedia.
Image 1Heinrich Rudolf Hertz (1856–1894) proved the existence of electromagnetic radiation (from History of radio)
Image 2Oliver Lodge's 1894 lectures on Hertz demonstrated how to transmit and detect radio waves (from History of radio)
Image 3Advertisement placed on November 5, 1919, Nieuwe Rotterdamsche Courant announcing PCGG's debut broadcast scheduled for the next evening (from Radio broadcasting)
Image 7Diagram 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)
Image 11In 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)
Image 12British Post Office engineers inspect Guglielmo Marconi's wireless telegraphy (radio) equipment in 1897. (from History of radio)
Image 13Donald Manson working as an employee of the Marconi Company (England, 1906) (from History of radio)
Image 14Animation of a half-wave dipoleantenna 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)
Image 15Animated 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)
Image 17Around 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)
... that X-radiographs of Jan Lievens's circa 1629–1630 Self-Portrait showed that the artist made "transformative revisions to his appearance" in the portrait?
... that two state representatives got into a fight in the parking lot of Miami's Radio Mambí after one's father insulted the other's on the air?
... that the relative rarity of the radiodontTitanokorys(video featured) in Marble Canyon suggests that the deposits in which it was found may represent the outermost edge of its distribution in life?
... that ethnic broadcasting pioneer Shushma Datt was the first Canadian woman to obtain a CRTC broadcast licence?
RadioDecember 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)
Radio StationsFebruary 15, 2005 "...to coordinate the activities of creating and maintaining articles about radio stations." (Example: Pulse FM Kingborough & Huon)
PodcastingJanuary 21, 2007 "...to make Wikipedia's knowledge of notable Podcast and podcast-related information as complete as possible." (Example: Podcast)
Amateur Radio(Inactive), August 24, 2006 "...to improve Wikipedia's articles related to Amateur radio, maintain the amateur radio category and its sub-categories for clean organization, and to produce and maintain templates for Amateur radio-related topic identification." (Example: Amateur radio)
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