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|City||Ciudad Juárez, Chihuahua|
|Branding||Calibre 800/Radio Cañón|
|Callsign meaning||X-ROcK (former branding)|
|Former callsigns||XEPNA (19??-1936)
|Owner||Grupo Siete Comunicación
(Emisiones Radiofónicas, S.A. de C.V.)
The concession history for XEROK begins not in Ciudad Juárez but in Piedras Negras, Coahuila, 413 miles (665 km) away, with the authorization for XEPNA 660, 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 Doherty modulation, which while complicated, allowed extremely high levels[clarification needed] 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 U.S. "Carr Collins Crazy water crystals" (a mineral treatment and patent medicine) was a well known advertiser, as was "Baby Chicks by Mail". Some listeners remember hearing 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 World War II and during and following the Korean War, U.S. 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 U.S. 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 due to Mexican government restrictions on foreign language programming. 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. The exception, by 1975, was "morning drive" programming, which was on a 4-hour delay that allowed for timely news and weather reports. 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,[when?] 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).
The station usually operated with 50,000 watts days (extra power was more or less wasted by day, as the ground wave could not be pushed far enough to reach more population. By night the skywave transmission was helped by extra power sometimes to as high as 150,000 watts.
The Bill Branch built transmitter was used until 1971, when a CCA transmitter was installed. It was also the cause of Branch's death. Later they got a Continental Electronics 150 kW unit. The Continental required a couple of minutes to change from low to high power settings, and the manual operation of switches in the front and the back. The station now uses a 50 kW Harris DX-50. Its base of operation and studios in El Paso were at 2100 Trawood, now the location of Grupo Radio Centro's El Paso operations (namely XHTO-FM). There is open feed line out to the tower.
- Instituto Federal de Telecomunicaciones. Infraestructura de Estaciones de Radio AM. Last modified 2017-02-27. Retrieved 2015-04-09.
- IFT concession history