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XEROK-AM is a Mexican AM (mediumwave) radio station licensed to operate at a power of 150,000 watts on a carrier frequency of 800 kHz from Ciudad Juárez, Chihuahua. XEROK is the dominant station on 800 AM, a North American clear channel frequency. ==History== The concession history for XEROK begins not in Ciudad Juárez but in Piedras Negras, Coahuila, away, with the authorization for XEPNA 660,〔(IFT concession history )〕 made to the Compañia Radiodifusora de Piedras Negras. The callsign changed to XELO in 1936, authorized for 50 kW day from Piedras Negras but on 1110 kHz. When the station moved to Ciudad Juárez, it moved to 800 kHz and tripled its power. The 150 kW plant was custom built in 1940–1941 by a team led by William "Bill" Branch, an early well known radio engineer. Branch built a series of amplifiers to get power from low power oscillator level to the 150 kW level. Modulation was achieved by Dougherty modulation, which while complicated, allowed extremely high levels of modulation and did not require large (and generally poor performing) audio coupling transformers. One of the border blaster stations aimed at American listeners, the long time format was Spanish Language programs by day, and brokered time programs (very often in English) targeted to audiences in the US. "Carr Collins Crazy water crystals" (a mineral treatment and patent medicine) was a well known advertiser, as was "Baby Chicks by Mail". Religious programs were aired sometimes with offers to send money in exchange for "autographed photos of J. Christ of Biblical fame".In the years following WWII and during and following the Korean War, US troops returning by sea from the Orient heard their first US-based radio broadcasts from this station, which frequently aired a radio evangelist who offered "send five dollars for your free autographed picture of Jesus Christ with eyes that glow in the dark." The daytime line-up moved in 1972 to a US station, 1060 AM KAMA (now KXPL) in El Paso, Texas. Around that time, a group of American investors – Grady Sanders, Bob Hanna, John Ryman and Bruce Miller Earle – leased the station and turned it into an English language top 40 radio station, with XELO being changed to XEROK. In the 1970s and into the 1980s, the station promoted itself as "X-Rock 80, The Sun City Rocker" due to its proximity to the "Sun City", El Paso. In spring 1975, XEROK was the highest rated top 40 radio station in the United States, with the possible exception of New York's WABC, according to Arbitron. It is not generally known that XEROK was live in only brief periods of operation. At the beginning the programs were recorded, in real time, on tape and the tapes were carried by messenger to the transmitter site where they played after a 24-hour delay, a concept similar to voice-tracking used by many stations today; this allowed the announcers to announce real clock times, but not material that is required to be accurate and timely, such as accurate weather forecasts. Later the recordings were made 12 hours ahead of time. Still later the station ran several parallel studios so that four shifts were recorded at a time. In 1977-78 studios were used at the tower near Satélite, Chihuahua for live operation. Eventually, the owners were granted permission from the FCC to install a 950 MHz studio-transmitter link (STL) across the border to feed the transmitter from El Paso live. The Mexican government also agreed to this arrangement but later, the station's top 40 demise halted the STL connection and all programming came out of the local Mexican studios after that. XEROK continued for a few years with immense popularity in El Paso, and much of the Southwest, but was eventually overtaken by an FM top 40 station (KINT-FM 97.5), as pop music listeners migrated to the FM band during the second half of the 1970s. In 1982, the station began a full-time, Spanish-language format as "Radio Cañon", the name the station still uses today. More recently, the station has been licensed to implement Ibiquity's "HD Radio" digital transmission system as it attempts to resume broadcasting at its licensed power level instead of on lower power (as little as 500 watts). 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「XEROK-AM」の詳細全文を読む スポンサード リンク
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