 It is one of Mexico's principal public television stations, with a format emphasizing cultural programming.Canal 22 is carried on all Mexican cable systems, on 25 SPR transmitters outside Mexico City, and as an international feed on some cable systems and AT&T TV in the United States.Channel 22, Mexico City's first UHF station, signed on April 15, 1982, as XHTRM-TV, the principal station of Televisión de la República Mexicana (TRM).