sentences:  Now branded as "La Poderosa", XHRF-FM and XERF-AM simulcast their programming and are owned by the Instituto Mexicano de la Radio (IMER), a Mexican public broadcaster.In earlier times, XERF was operated under the laws of Mexico by Ramón D. Bósquez and Arturo González, powered at 250,000 watts as a border blaster, featuring famed disc jockey Wolfman Jack.XERF commenced operations in 1947, receiving its concession on November 26 of that year, using the old facilities of John R. Brinkley's XERA, which ceased broadcasting in 1939.