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KGO (810 AM) is a news/talk radio station based in San Francisco, California. KGO is accessible throughout the western United States east to the Rocky Mountains, and in northern Mexico, southwestern Canada, and Alaska at night. KGO operated as the West Coast flagship radio station of the American Broadcasting Company (ABC) until the radio group was purchased by Citadel Broadcasting in 2007. The station is now owned by Cumulus Media, following its 2011 merger with Citadel. KGO has its current studios located in the SoMa portion of San Francisco's Financial District; before Cumulus took over the station, it was previously based in the same building as its former television partner KGO-TV at the ABC Broadcast Center. Its transmitter site is based in Newark near the Dumbarton Bridge. Two of KGO's three towers partially collapsed during the Loma Prieta earthquake on October 17, 1989. All three were replaced. ==History== After several late-night test broadcasts, using the experimental call letter 6XG, radio station KGO signed on the air on January 8, 1924, from General Electric's Oakland, electrical facility (the original two-story brick building, constructed specifically for the station on East 14th Street, still exists on the site), as part of a planned three-station network comprising WGY in Schenectady, New York, and KOA in Denver, Colorado. KGO was first known as the "Sunset Station"; at that time it operated with a then-impressive 1000 watts.〔"Open Station KGO at Oakland." Decatur IL Review, February 9, 1924, p. 23; also, "New KGO Will Open Tomorrow." Oakland Tribune, January 8, 1924, p. 15.〕 As was the custom with early radio stations, the programming consisted of performances by local talent, including the KGO Orchestra which provided some of the music; and a dramatic group known as the KGO Players, which performed weekly plays and short skits, often under the direction of Bay-area drama instructor Wilda Wilson Church. The station's music, which was also performed by other local orchestras and vocalists, would include classical selections as well as popular dance music the next night. Due to GE's involvement in RCA and RCA's launch of the NBC radio network, KGO was soon operated by NBC management as part of the NBC network. See the KNBR entry for a fuller discussion of NBC's San Francisco radio operations. By the 1928 Band Plan, 790 kHz was allocated to Oakland, California, and to KGO, which was then owned by General Electric, on an internationally cleared basis. In order to obtain a clear channel in Schenectady, New York, for what would become the present-day WGY, GE effected a breakdown of 790 kHz, whereby WGY (q.v.) would assume the maximum permissible power, and KGO would be lowered in power to 7.5 kW, which was then lower than the minimum permissible power for a clear channel station (10 kW), but higher than the then maximum permissible power for a regional channel station (5 kW). Both stations retained omnidirectional antennas. Therefore, GE effectively removed from the West one of its eight clear channels and added an additional clear channel to the East thereby giving the East nine clear channels and the West only seven. The other "regions" in the Band Plan all retained their allotted eight clear channels. In 1941, stations on 790 kHz were moved to 810 kHz. On December 1, 1947, KGO was directionalized, and power was increased to 50 kW, the new minimum (and maximum) power for a U.S. clear channel. An article in Broadcasting magazine noted that the increase "retired the nation's oldest regularly operating transmitter -- a 7,500-watter ... in use since Jan. 8, 1924." 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「KGO (AM)」の詳細全文を読む スポンサード リンク
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