The function of an RF modulator TV is simple. The RF modulator converts the video (andor audio) output of a DVD player (or camcorder or video game) into a channel 34 signal that is compatible with a TV's cable or antenna input. Converts one or more HD-SDI digital video inputs to encoded MPEG-2 or H.264 streams. Outputs ASI, IP, & RF in QAM-256 J.83ABC for US Cable format or DVB-C. Browse this site for more information on RF modulator TV.