we are installing a video wall in a hotel. Is there a box or device,that is also a tuner, that the typical coaxial cable (that would connect to the back of a typical TV) can connect to which could then be connected, via HDMI cable, to the video wall 'switch' that controls the inputs of the video wall? The "switch has only HDMI ports.
You will need to contact Comcast at 800-391-3000, use the Digital Video option, and ask the video technical agent about the MDTA Unit and this is a Comcast Video BOX that has one Coaxial Cable input connect and multiple TV box output connects. I am not 100% positive that the MDTA supports either Coax or HDMI output connects. If it supports both then you will be able to simply connect the MDTA outputs to your HDMI switch ports and you objective can be achieved.