Modulator for converting an HDMI signal into a DVB-T/-C / DTMB or ATSC-T/-C channel. The HDMI input supports all video resolutions up to 1080/60p. A loop-through input is available for interconnection with external signal sources. The device can be used flexibly and can process HDMI signals from receivers, computers, cameras, DVD players and many other devices. The modulator is operated via the supplied plug-in power supply unit.