The Radio PortalWelcome to Wikipedia's portal for Radio. Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. It does not require a medium of transport. Information is carried by systematically changing (modulating) some property of the radiated waves, such as their amplitude or their frequency. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. The word 'radio' is used to describe this phenomenon, and television, radio, and cell phone transmissions are all classed as radio frequency emissions. Modulation is the process where speech, music and the like are impressed onto the carrier wave of a transmission. Detection or demodulation is the reverse process which takes place in a receiver. The speech, music etc. is recovered and may then be amplified and applied to an ear piece or a loud speaker. The most common forms of modulation are Amplitude Modulation (AM) and Frequency Modulation (FM) both of which use different modulation and detection circuits. Cell phones, digital radio and digital television use more complex modulation and demodulation systems. The simplest AM receiver is the Crystal Set or Crystal Radio. Demodulation is achieved by a semiconductor diode. One of the earliest forms of detection consisted of a thin copper wire in contact with a small chunk of Galena Rock. Adequate signals could be heard in headphones for up to 50 km with simple arrangements. Selected articleThe Hitchhiker's Guide to the Galaxy is a science fiction comedy radio series written by Douglas Adams (with some material in the first series provided by John Lloyd).[1] It was originally broadcast in the United Kingdom by the BBC, and was soon afterwards broadcast on global short wave radio on the BBC World Service, in 1978. Broadcasting by National Public Radio (one of their first to occur in stereo) in the United States followed in March, 1981, with a repeat broadcast in September.[2] The following year, 1982, the BBC series was carried by CBC Radio (Canadian Broadcasting Corporation). A pilot programme was commissioned in March 1977, and was recorded by the end of the following June. A second series was commissioned in 1979, and this was transmitted in 1980. Episodes of the first series were specially re-recorded for release on LP records and cassettes. After the 1980 transmissions of the second radio series, the first series was adapted for television; it included some material originally written by Adams for stage adaptations and the aforementioned LP adaptation. This in turn was followed by five novels, a computer game, and adaptations into three series of comic books. Adams considered writing a third radio series, to be based on his novel Life, the Universe and Everything, in 1993 but the project did not begin for another ten years, after Adams's death. Dirk Maggs, with whom Adams had discussed the new series in 1993, 1997 and 2000, eventually directed and co-produced radio series adaptations of that novel, as well as So Long, and Thanks for All the Fish and Mostly Harmless.[3] These became the third, fourth and fifth radio series. The third series was recorded in 2003 and transmitted in September and October 2004, and the fourth and fifth series were recorded in late 2004 and early 2005 and transmitted in May and June 2005. Recordings of all five series have been released on audio cassette and compact disc, and the third series was released on DVD in 2006, after being "delayed" more than once.[4][5] Selected imageThis diagram shows both the position of radio waves in the electromagnetic spectrum as well as how radio waves are used for communication. Photo Credit: User:LadyofHats Selected stationBBC Local Radio is the BBC's regional radio service for England and the Channel Islands, consisting of 40 stations. Initially, stations had to be co-funded by the BBC and local authorities, which only some Labour-controlled areas proved willing to do. Radio Leicester was the first to launch on 8 November 1967, followed by Sheffield, Merseyside and Nottingham. By the early 1970s, the local authority funding requirement was dropped, and stations spread across the country; many city-based stations later expand their remit to cover an entire county. Today, stations are asked to target their coverage to Dave and Sue, two fictional fifty-five-year-olds. CategoriesThe following are categories relating to radio: Radio by country • Radio networks • Radio formats • Radio stations • Radio people • Radio programs • History of radio • Radio drama • Amateur radio • Pirate radio • Types of radios • Radio technology • Radio frequency receivers • Radio hobbies • Radio logos • Radio writers • Years in radio • Military radio systems • Radio astronomy • SETI • Radio-related lists • Radio stubs Radio listsThe following are lists relating to radio: 97.3 FM • 105.9 FM • BBC Radio 4 programmes • Dad's Army radio episodes • Fictional radio stations • FM broadcasting in Egypt • High school radio • Indie radio stations • Q92 • Q107 • Radio Stations of the BBC • Reith Lecture • Sirius Satellite Radio stations • This American Life episodes • UK radio programmes • World's oldest radio stations • XM Satellite Radio channels • Z103 • AOL Radio • Angel Radio • List of radio stations in Kosovo • WBBM (AM) Selected quote
Selected biographySir Michael Terence Wogan, KBE DL (born August 3 1938) more commonly known as Terry Wogan, is a veteran Irish radio and television broadcaster, who has worked for the British Broadcasting Corporation in the United Kingdom for most of his career. He has been a leading media personality in Ireland and the UK since the late 1960s, and is often referred to as a "national treasure" of both the United Kingdom and his native Ireland.[6][7] Terry Wogan, the son of a grocery store manager in Limerick, was educated at the Jesuit school of Crescent College from the age of eight. He experienced a strong religious upbringing, later commenting that "There were hundreds of churches, all these missions breathing fire and brimstone, telling you how easy it was to sin, how you'd be in hell. We were brainwashed into believing."[8] Despite this, he has often expressed his fondness for the city of his birth, commenting on one occasion that "Limerick never left me, whatever it is, my identity is Limerick."[9] Related portalsWikiProjects
Radio topicsAssociated Wikimedia
|
- ^ The spelling of Hitchhiker's Guide has varied in different editions. For consistency this article always spells it this way. See Spelling of Hitchhiker's Guide.
- ^ Adams, Douglas. (2004). The Hitchhiker's Guide to the Galaxy: 25th Anniversary Illustrated Collector's Edition. Introduction by M.J. Simpson. Harmony Books. pp. Page 38. ISBN 1-4000-5293-9.
- ^ Adams, Douglas. (2005). Dirk Maggs, dramatizations and editor., ed. The Hitchhiker's Guide to the Galaxy Radio Scripts: The Tertiary, Quandary and Quintessential Phases. Pan Books. pp. Page xiv. ISBN 0-330-43510-8.
- ^ DouglasAdams.se Webchat with Dirk Maggs 16 June 2005. Accessed 5 December 2006.
- ^ DouglasAdams.se forum discussion on the October 2006 release of the "Tertiary Phase" DVD.
- ^ The Guardian (May 3, 2001). "Wogan's run". The Guardian Unlimited. Retrieved May 24, 2007.
- ^ Farrell, Gisella (May 2006). "Fifty Years of Eurovision". The Sun Online. Retrieved May 25, 2007.[dead link]
- ^ Mason, Marilyn (August 1, 2004), "Suffer Little Children", New Internationalist, retrieved June 2, 2007
- ^ Sheridan, Anne (September 8, 2006). "Wogan's message to city". Limerick Leader. Retrieved May 24, 2007.