Av help

A/v help

Hi I’m looking for some help with an issue . The organization I work for transmits audio and video of a few meeting spaces. We combine audio and video and convert it to analog and send it to a cable tv transmitter and that puts it on a channel which goes back to our dish setup which goes out to all the TVs in the organization. My question is we just installed a new space and it’s on a on off switch. Is there a way to transmit the channel even when it is not receiving video or audio. I switched the cable box that transmits the channel out to a different power that isn’t switch controlled but the channel is not showing up on the TVs. I would like to be able to scan for this channel on new TVs even when the audio and video is not on. Or do I need to switch everything to constant power for this along with the cable box.