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KNX is an AM broadcast radio station on 1070 kHz in Los Angeles, California, United States. It runs an all-news format. The station is owned by the CBS Radio subsidiary of CBS Corporation. KNX continues to hold a Class A license from it being one of the original clear-channel stations allocated under the 1928 U.S. band plan. KNX broadcasts from facilities shared with sister stations KCBS-FM, KTWV and KAMP-FM located on Los Angeles' Miracle Mile; its transmitter and antenna array site are located at Columbia Park in Torrance (northeast of the intersection of Hawthorne Boulevard and 190th Street). The station also broadcasts a HD Radio signal, streams online, and simulcasts on the FM band on the HD2 channel of KAMP-FM (97.1 FM).〔http://www.hdradio.com/station_guides/widget.php?id=36 HD Radio Guide for Los Angeles〕 ==History== KNX began as a five-watt amateur radio station, 6ADZ, which Fred Christian put on the air on September 10, 1920, broadcasting on a wavelength of 200 meters (1500 kHz). In December 1921, the station moved to 360 meters (833 kHz) and became KGC, sharing time with other stations that broadcast on the same frequency.〔http://www.oldradio.com/archives/general/buildbcb.html〕 On May 4, 1922, the station increased power to 50 watts and became KNX. Power was raised to 100 watts in 1923. A year later, Fred Christian sold KNX to Guy Earl, owner of the ''Los Angeles Evening Express''.〔Article by radio historian Jim Hilliker on http://laradio.com/ September 26, 2013.〕 During the 1920s KNX, like most stations across the country, changed frequencies several times, landing on 1050 AM as a result of the Federal Radio Commission's reconfigurations of the AM radio band in 1927 and 1928. In 1929, the station's transmitter was upgraded from 500 to 5,000 watts, and in 1932, was raised to 10,000 watts of power. During this time, the station changed owners and was then operated by the ''Western Broadcast Company''. In 1933, the station moved its studios to another part of Hollywood, after being granted permission by the FRC on June 7, 1932, to raise its output to 25,000 watts. The following year, KNX's transmitting power was raised to the nationwide maximum of 50,000 watts, which the station continues presently.〔(Sakrison site )〕 It changed to its current 1070 AM channel in 1941. CBS purchased and began operating KNX as its West Coast flagship station in 1936, ending an eight-year affiliation with KHJ.〔"Biggest station deal in history effected." ''Broadcasting'', April 1, 1936, pp. 7, 62. ()()〕 In 1938, the CBS Columbia Square studios〔(Today in Radio History August 12 2005 )〕 were dedicated for KNX as well as West Coast operations for the entire CBS radio network; that October, the station carried Orson Welles' celebrated version of ''The War of the Worlds'' . Several legendary performers from the Golden Age of American network radio broadcast from there, including Jack Benny, Bing Crosby, George Burns, Edgar Bergen,〔 and situation comedy star Bob Crane, who was KNX morning man between 1957 and 1965 at the same time he was appearing as a featured supporting player on the ABC television network's ''The Donna Reed Show''.〔(who2 )〕 KNX was a strong competitor in the Los Angeles market while Crane was a morning personality, but began declining in popularity after he left to star in the CBS television series ''Hogan's Heroes''. Following the example of corporate sister station WCBS in New York City, which had enjoyed renewed success with an all-news format, KNX then became an all-news station in the spring of 1968;〔(knx1070 Our Heritage )〕 its first major breaking news coverage was of the assassination of Democratic Presidential candidate Robert F. Kennedy, in the Ambassador Hotel in Los Angeles, in June of that year. In August 2005, KNX moved out of Columbia Square after operating there for 67 years, and began broadcasting from new studios in the Miracle Mile district on Wilshire Boulevard.〔(KNX History ) (Archived 2009-08-15 by WebCite at )〕 In 2009, KNX adopted the slogan "All News, All the Time." It was previously used for 40 years by KFWB, KNX's historic rival in the news radio wars before both became sister stations through the 1995 merger of Westinghouse Electric (KFWB's owner) and CBS. KFWB's format change to news-talk in September 2009 (and later to all sports)now leaves KNX the only all-news outlet in the Los Angeles area, which is now emphasized in its alternate slogan, "Southern California's only 24-hour news & traffic station". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「KNX (AM)」の詳細全文を読む スポンサード リンク
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