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.
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.
On XEDF, this meant a whole new format: DF Noticias 970,[6] an all-news station, and from 1989 more women's programming with hosts such as Maxine Woodside was introduced.
103.3 FM got its start as XERPM-FM, a station owned by Radio Programas de México and put on air in 1957.
The Primera Cadena is Radio Fórmula's flagship network with its top-tier personalities and carriage across Mexico on several dozen affiliated stations, with programming from personalities including Maxine Woodside, Joaquín López-Dóriga, José Cárdenas and Eduardo Ruíz Healy.