Not a security setup but I have an old 1980 Sony Trinitron TV that has buttons for around a dozen or so channels. Is there any affordable tech available that could simulate/grant me the power to setup/broadcast at least 4 CCTV channels? This would be done via coaxial I was imagining, with the goal of being able to switch between these discrete channels via the buttons on the TV. I'm also curious how I would be able to assign content to each channel.