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City of license Ciudad Acuña, Coahuila[1]
Broadcast area Northern Mexico, southern United States[2]
Branding La Poderosa (English: The Powerful)
Slogan Más cerca que nunca (English: Closer than ever)
Frequency 1570 kHz (also on HD Radio)
103.9 MHz (also on HD Radio)
First air date 1947
Language(s) Spanish
Power (AM) 100,000 watts[1]
ERP (FM) 4 kW[3]
Class (AM) A
Facility ID (AM) 103943
Owner Instituto Mexicano de la Radio[1]
Webcast XHRF-FM

XHRF-FM is a radio station in Ciudad Acuña, Coahuila. It gained fame on the AM band as XERF-AM, a Mexican clear-channel station on 1570 kHz and a 250-kilowatt border blaster owned by Ramon D. Bosquez and Arturo Gonzalez, used by famed disc jockey Wolfman Jack. Now branded as La Poderosa, it is owned by the Instituto Mexicano de la Radio (IMER), a Mexican public broadcaster.

In earlier times, the station was operated under the laws of Mexico by Ramón D. Bósquez. Once world-famous, XERF commenced operations in 1947 using the old facilities of John R. Brinkley's XERA, which ceased broadcasting in 1939. XERF was not a continuation of XERA.


  • 1949 through the 1970s 1
    • The 1959 border blaster 1.1
    • Paul Kallinger 1.2
    • Wolfman Jack (1962 to 1964) 1.3
    • Lawlessness and death 1.4
  • Brief rebirth in 1980s 2
    • Love 16 2.1
    • Texas Night Train 2.2
    • Wonderful Radio London 2.3
    • Constant transmitter problems 2.4
    • Final proposition 2.5
  • How commercial XERF faded away 3
  • XERF under IMER 4
    • AM-FM migration 4.1
    • HD Programming 4.2
  • See also 5
  • References 6
  • External links 7
    • History 7.1

1949 through the 1970s

The facilities of the old XERA border blaster which had been created by John R. Brinkley, were confiscated by the Mexican government in 1939 and the license for Villa Acuña remained silent until 1947. In that year a new license was granted to Ramon D. Bosquez who created a new radio station originally using the old facilities of the defunct XERA. The station came on the air with a power of 100 kW. For many years the station made money by selling its time after nightfall to American evangelists who broadcast in English to the United States.

The 1959 border blaster

In 1959 a new group of investors, Ramon D. Bosquez and Arturo Gonzalez formed a Texas corporation called Inter-American Radio Advertising, Inc. which was located on Pecan Street in Del Rio, Texas. While the license of XERF rested in the hands of Ramon D. Bosquez, a Mexican national, the actual control of the airtime and the management of the facilities in Ciudad Acuña, Mexico were under the control of Inter-American Radio Advertising, Inc.

The Texas company purchased a 250,000 watt RCA transmitter to beam an omni-directional clear channel signal on AM 1570, which originated some distance from the old XERA facilities within three new prefabricated concrete buildings with flat roofs. The sales brochure for XERF offered this explanation about the operation of the station (emphasis and wording shown as in the original text):

There is, of course, one BIG difference between U.S. and Mexican Stations, and that is a matter of POWER; American Stations are limited a maximum 50,000 watts ... a limitation that does not exist under Mexican regulation. X.E.R.F. for example, is licensed to operate on 250,000 watts power, and the Department of Communication and Public Works of the Mexican Government has authorized a power increase to 500,000 watts. Such power could result in serious interference if wave lengths were not strictly maintained, but the equipment with which X.E.R.F, operates assures its signal to stay "right on the beam." This is something constantly checked by FCC monitor stations, a degree of regulation by the U.S. Government alike that is imposed upon U.S. Stations. Operating on a clear channel, X.E.R.F. is heard nightly in all parts of the fifty States in the United States, Canada and Latin-America.

Although reference was made to a power increase, the station only had an RCA 250 kW transmitter.

Paul Kallinger

The booming bass voice of Paul Kallinger was used to sell many of the products on XERF. At night, his recorded spots between the different sponsored shows served as a jingle break. Kallinger remained on the Texas side of the border and recorded his spots at a studio in Del Rio, because he did not want to become embroiled with the lawlessness that swirled around the XERF studio and transmitter on the other side of the border. In between the different religious programs, Kallinger would tell XERF listeners in various versions that:

It’s always good to know that we have some fine people out there listening to the most powerful commercial voice in the world ... From alongside the beautiful Rio Grande, this is XERF, Ciudad Acuña, Coahuila, Mexico. Our mailing address is Del Rio, Texas. This is Paul Kallinger.

To satisfy the Mexican authorities, the portion identifying the station’s call letters and the station’s location in Mexico, would then be repeated in the Spanish language.

Wolfman Jack (1962 to 1964)

With the birth of rock and roll and its promotion by disc jockeys such as Alan Freed, a new interest was taken in the unrestricted superpower airwaves that were available in Mexico. Alan Freed had originally called himself the Moondog after hearing the name used by an experimental street musician in New York City. Freed not only adopted the name but used the recording of a howl to give his early broadcasts a unique character since he was featuring African-American music that was getting a great reception from America's White teenagers.

One of Freed's fans was Bob Smith, a disc jockey who also adopted the Moondog theme by calling himself Wolfman Jack and adding his own sound effects. Smith took his act to Inter-American Radio Advertising, who sent him to the studio and transmitter site of XERF. It was here that Wolfman Jack invented his own style of border blasting by turning the airwaves into one long infomercial featuring music and off-the-wall products.

Wolfman Jack gained a huge audience which brought in enough money to not only pay the bills, but to cause bandits and corrupt officials to also take enough interest in taking over his promotions for themselves. As a result Smith began to pay his own security force to protect him, because although he lived in Del Rio, Texas, because of the Brinkley Act he had to actually broadcast from the station itself in Ciudad Acuña in Mexico.

Lawlessness and death

According to Arturo Gonzalez there was a shootout in 1962 in which one person died. In another incident in 1964 two people died. No one was ever held accountable for the deaths. It was following the second gun battle when Bob Smith decided to leave for American Graffiti.

Meanwhile XERF reverted to selling time according to the old format devised by Dr. Brinkley. It featured paid programming, most of it from American fringe evangelists, right-wing political groups and Black Nationalist messages from the Nation of Islam.

With the advent of FM stereo radio broadcasting, interest in the mono static signals of XERF began to wane and its signal was switched from the 250 kW RCA transmitter, which was never paid for and which consistently kept breaking down, to a new 50 kW transmitter which was most often run at 10 kW days and 50 kW nights, and which only recently has returned to 50 kW full-time.

As is most often the case with "border blaster" transmitters, the specialized high-power transmitting tubes, which were custom-made in small lots, have become unavailable, and the only economic recourse has been to commercially made 50 kW or 100 kW transmitters.

Although Mexican "clear channel" stations prefer 150 kW, or more, as per their international "notification", tubes which are capable of such outputs have become scarce, and there is very often little or no ongoing manufacturer support.

It is possible, although not without difficulty, to make a "composite" transmitter up to perhaps 2000 kW, using multiple off-the shelf 50 kW transmitters. This approach is mainly reserved for government agencies which have very deep pockets, as in the recent installation of a 2000 kW transmitter and directional array in Saudi Arabia.

Brief rebirth in 1980s

In 1982 Bob Smith (Wolfman Jack), ran into a radio engineer friend named Mike Venditti and he told Venditti that no one had been able to get XERF back on full power with its old RCA 250 kW transmitter, because RCA did not have any manuals relating to the equipment. Venditti then approached Gonzalez with a business proposition.

Love 16

In exchange for restoring the main RCA transmitter to active duty, Venditti asked Gonzalez to lease him the daytime hours from 6AM to 9PM. Because the station was only operating on a fraction of power from the 50 kW transmitter, Gonzalez was only using the daytime hours to rebroadcast programming in Spanish from the Mexican national network. After 9PM XERF reverted to its sponsored format of mainly American religious programs.

Venditti succeeded in getting the old transmitter to work and at first his new Love 16 station (a name taken from the 1570 AM frequency), broadcast an English language format composed of a mixture of soft rock, oldies, middle-of-the-road, country and Big Band music. This format did not sell and soon Love 16 was programming a modern Christian music format. That did not work either.

MIchael Venditti was a member of The Word Outreach Center, a Non Denominational Church in Del Rio during this time. The church was pastored by Michael Kyle, a native of Del Rio and longtime broadcaster himself, having worked in both local radio stations and with Paul Kallinger. Michael Kyle worked an air shift at the station in Mexico when the format went to all music.

Before Venditti pulled the plug on his "Love Radio", which eventually signed off the air, it attracted a lot of publicity in the Texas press concerning the rebirth of XERF as a real border blaster.

Texas Night Train

Another group from the Dallas and Fort Worth area then replaced Bill Mack with a nightly taped program called the Texas Night Train. Because the marathon shows which featured every type of popular music and comedy were taped, there was no problem with a lack of live land line connections. Weekend editions were also heard on some U.S. radio stations in Texas including KXOL, an AM station in Fort Worth.

The show took telephone requests which were then mixed into the following-night program tape. Its big feature was the voice of the presenter who was identified as the "Night Hawk", but whose voice some mistook as a clone of Wolfman Jack. He was heralded over the sound effects of a massive steam train which gave the impression the Texas Night Train was chugging its way across Texas.

Wonderful Radio London

Another group that was also based in North Texas who were aware of the Bill Mack venture on XERF and the replacement of his time slot by the Texas Night Train were the owners of a company attempting to revive the British offshore station Wonderful Radio London. Headed by Ben Toney, who had been the original program manager for Big L in the 1960s, the new company also had links to Don Pierson who had founded the station in 1964. Ben Toney and his business associate went to Del Rio and met with attorney Arturo Gonzalez in his law office which he shared with Inter-American Radio Advertising, Inc.

Arturo Gonzelez was of Mexican heritage and a U.S. citizen. He held an exclusive contractual arrangement with XERF's silent license holders across the Rio Grande in Mexico. Arturo Gonzalez was able to enforce his own contract with the transmitter licensees because his Inter-American Radio Advertising, Inc., held the purse strings to all of the money paid by American advertisers for airtime on XERF.

Built into the costs of operation were not only the expenses incurred from the electrical bills and basic engineering help, but from payments for the physical security of the station as well as the attorney’s own profit margin. Little if anything was ever spent on studio, transmitter or tower equipment.

After concluding the arrangement with Arturo Gonzalez in Del Rio, Ben Toney and his associate then drove across the Rio Grande and on to the dirt roads and through the shacks that led to the small antiquated studio and barn that housed the facilities of radio station XERF. It appeared that with the new interest being shown in the station from Texas, that it would be possible to restore the signal of the station to a dependable high-power strength using the old RCA 250 kW transmitter.

Beginning on August 13, 1984 the Wonderful Radio London Top 40 Show was heard nightly via taped programs which were recorded in England and flown to Texas. In 1984 British music was once again "invading" the US charts in a major way, just as it had in the 1960s. However, the U.S. charts were about 12 months behind the British music charts and so Wonderful Radio London positioned itself as playing tomorrow’s hits today. To accommodate the new schedule, the Texas Night Train was pushed back to allow the Big L show to serve as its lead-in beginning at midnight Texas time. Omnibus weekend editions of the Big L program were also heard on several US radio stations, including KXOL in Fort Worth.

The first of the daily Wonderful Radio London shows that were broadcast by XERF was introduced by the voice of John Lennon who was asked in 1964 what he thought about American commercial radio. On the second night, which was the anniversary of the close-down of the original Wonderful Radio London on August 14, 1967, airchecks were played beginning with the last Breakfast Show that had been broadcast. The program for August 14, 1984 began with a record dedicated to Ben Toney in 1967, who then cut in on the 1984 program to thank the DJ that he had personally hired 30 years earlier. This dedication was followed by the voices of Mick Jagger, Ringo Starr and many others all bidding the station farewell. The theme of the show was The BeatlesYou say goodbye and we say hello announcing the new programming that would begin the following night on August 15, 1984.

Constant transmitter problems

No sooner had the Wonderful Radio London Top 40 Show started, when the Texas Night Train folded. Its demise was due to the same problem that Bill Mack had encountered. The Texas Night Train often disappeared into the static of the AM band when the XERF transmitter power dropped off. Advertisers would not buy time, and with mounting debts, the Texas Night Train came to the end of its line. Linking the owners of the Texas Night Train and Wonderful Radio London programs was KXOL in Fort Worth where both shows were also aired on weekends. KXOL was in the process of being sold and Harold Glen Martin, who later returned to work at KXOL, was at that time the only live on-air personality at XERF. Using a "hillbilly" accent under the name of "Billy Purl", he presented a live country music program to the fill dead air on XERF. Martin claims the honor of being the last live voice heard on XERF. According to the Hot Springs, Ark., Sentinel Record newspaper, Billy Purl's gold lamé XERF jacket is part of the Rock 'n' Roll Hall of Fame's border radio collection in Cleveland, Ohio.

Final proposition

To mark the exact date of its original start-up, Wonderful Radio London International (WRLI) was planning its own return as a full-time radio station broadcasting from off the coast of England beginning in December 1984. (This was during the period in which both Radio Caroline and Laser 558 were broadcasting successfully from ships off the British coast, though not without harassment from the authorities.) After the demise of The Texas Night Train marathon program, the WRLI team approached attorney Arturo Gonzalez in Del Rio with a new proposal. Since XERF reception reports had been received from Europe when the power was maintained at 250,000 watts, it was proposed that Wonderful Radio London would take over the entirety of the hours after midnight CET. This would correspond to 6 AM Greenwich Mean Time or Universal Coordinated Time. Under the joint call sign of Wonderful Radio London via XERF and operating as a full service station at full power, Big L would be able to attract both the additional funding and advertising necessary to also make the new offshore project into a commercial success.

How commercial XERF faded away

However time had run out for the super power XERF when attorney Arturo Gonzalez was forced to retire. His own age and the additional questionable legalities, among other things, of brokering a contract that would involve yet another country (UK) would become more of a headache than he wanted at his time of life. Without his Texas sales connection the silent owners of the ancient transmitter facilities also knew that the days of XERF were finally over.

When Arturo Gonzalez was forced out of the picture due to corruption and alleged fraudulent issues, the Mexicans were left with out-of-date broadcasting facilities and a market that wanted both FM stereo and MTV on cable television. So they handed their license back to the government of Mexico. By this time the preachers had also drifted to cable outlets such as Jim Bakker’s PTL and Pat Robertson’s CBN cable television networks.


On February 22, 1986, Instituto Mexicano de la Radio (IMER) (Spanish: Mexican Radio Institute), a Mexican nationwide public radio broadcaster, purchased the assets of the Compañía Radiodifusora de Coahuila, S.A. The concession was formally transferred to IMER on February 20, 1987. However, once IMER acquired XERF, it was left with the old, broken transmitter, for which there were no parts, and a second, 50 kW transmitter, which was also having problems, and XERF operated with only 15,000 watts. With the acquisition of a new transmitter, XERF raised its power to 100 kW in May 2004.[2]

The goal of XERF under IMER is to provide a broadcast service that links migrating Mexicans to their original communities.[2] The station's programming consists of news/talk programs and Mexican popular music.

As of 2014, XERF is licensed for 100,000 watts domestically,[1] but is listed as a foreign station with 250,000 watts of power in the U.S. FCC databases.[4]

AM-FM migration

As part of the Mexican government scheme to move as many AM stations as possible to the higher quality FM band, XHRF-FM 103.9 signed on February 3, 2012.[2]

HD Programming

XHRF began broadcasts in HD Radio on October 28, 2012.

  • The HD2 stream relays XHOF-FM "Reactor", while
  • HD3 features XHIMER-FM "Opus", both IMER stations in Mexico City.[5]

See also

  • Border blaster — a list of super-power radio stations located on the international border of Mexico facing the United States of America
  • John R. Brinkley gives more details about the career of this "doctor".
  • Wolfman Jack gives more details about the career of this disc jockey who was featured in the 1973 movie American Graffiti.
  • Wonderful Radio London gives more details of the history of this station.
  • Don Pierson gives more details about the career of this offshore broadcasting pioneer.
  • ZZ Top celebrated the station in their song, "I Heard It On The X".


  1. ^ a b c d Instituto Federal de Telecomunicaciones. Infraestructura de Estaciones de Radio AM. Last modified 2015-08-14. Retrieved 2014-07-02.
  2. ^ a b c d "Cronología" (in Spanish).  
  3. ^ Instituto Federal de Telecomunicaciones. Infraestructura de Estaciones de Radio FM. Last modified 2015-08-14. Retrieved 2014-12-19.
  4. ^ Query the FCC's AM station database for XERF. Retrieved 2009-04-25.
  5. ^ HD Radio Guide for Mexico
  • Wolfman Jack's old station howling once again. - Dallas Times Herald, January 2, 1983. - Article about Bill Mack and the restoration of the old RCA 250 kW transmitter by Mike Venditti
  • Del Rio to Honor Wolfman Jack - San Antonio Express-News, June 16, 1995. - Article describing how Bob Smith (Wolfman Jack) came to Del Rio, Texas to meet Arturo Gonzelez and Ramon D. Bosquez and wanting to know who was the owner of radio station XERF. Arturo Gonzelez who was 94 in 1995, recalls his first meeting with Bob Smith in 1963. Details confirm that XERF had a 250 kW transmitter.
  • The Roguish World of Doctor Brinkley by Carson, Gerald. - Rinehart, New York.1960.
  • Border Radio by Fowler, Gene and Crawford, Bill. Texas Monthly Press, Austin. 1987 ISBN 0-87719-066-6
  • Big Beat Heat (Alan Freed and the early years of Rock & Roll), by Jackson, John A. - Schirmer Books, New York. 1991. ISBN 0-02-871155-6
  • Mass Media Moments in the United Kingdom, the USSR and the USA (includes details of XERF in 1984), by Gilder, Eric. - "Lucian Blaga" University of Sibiu Press, Romania. 2003 ISBN 973-651-596-6

External links

  • La Poderosa (Spanish) — official IMER website
  • FCC information for XERF


  • "The Best Darn Story of the Whole 20th Century" — web page about XER, XERA, and XERF
  • "The X Factor" — transcript of episode about the border blasters from NPR's On the Media, 2008-07-04
  • Reference to "Billy Purl", the last live voice heard on XERF. — In a drop-down box Harold Glen Martin ("Billy Purl") makes reference to five 50 kW transmitterss (=250 kW). However, XERF had a reasonably new CCA 50 kW transmitter and an ancient RCA 250 kW transmitter, as referenced above in a note by Bob Smith.
  • Tribute to Mike Venditti who died on April 27, 1998

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