Broadcasting on 88.7 FM, XHJX is the local transmitter for Radio Fórmula programming.
XEJX-AM 1450, later 1250, signed on air on October 11, 1941, after receiving its concession on July 8 of that year.
General Ramón Rodríguez Familiar, a former governor of the state of Querétaro, obtained the concession through the company Radio Emisora Queretana, S. de R.L.
In 1962, XEJX and XENA moved to new facilities in Querétaro, inaugurated by Governor Manuel González Cossio, known as the Edificio Desarrollo Radiofónico (Radio Development Building).
In 2012, XEJX began direct operation from Mexico City, and the FM station launched.