Radio Fórmula

The history of XERFR-AM begins with the concession for XEK-AM, originally on 990 kHz, awarded to Gen. Miguel M. Acosta on November 24, 1932. In the 1950s, XEK-AM shipped its callsign to Nuevo Laredo, where it was picked up by 960 AM, then XEDF-AM. The XEDF-AM callsign, which would have been sequentially assigned, thus was brought to Mexico City.

In 1964, the name of the concessionaire became Radio Distrito Federal, a name also adopted by the station on-air in 1968. Grupo Radio Fórmula traces its beginnings to 1968, when Rogerio Azcárraga Madero bought the station from Emilio Azcárraga's Radiópolis system to form what was then known as Grupo ORO. At this time 970 AM carried a rock music format. The goal was to introduce rock 'n' roll music to Mexico; it did not hurt that the station was co-owned with the Orfeón record label.

The 1980s saw Rogerio Azcárraga Madero lead an overhaul of Radio Fórmula. The stations switched from music to talk formats, while new and renowned personalities were brought in to host programming. On XEDF, this meant a whole new format: DF Noticias 970,[4] an all-news station, and from 1989 more women's programming with hosts such as Maxine Woodside was introduced. The 1990s were the decade of Radio Fórmula's expansion across Mexico, which increased the group's national reach and influence.

970 AM became XERFR-AM in 2000; XEDF-AM is now the callsign on 1500, formerly XERH-AM.