[Help] I need something to convert coax to S-video

I am doing a project for my work and we have run into a problem. We are looking for a converter that will let us play coax signals thru our projectors. We don't really want to invest in a VCR or a DVD player (we need 50) and we just want a box that will convert it. ANyone know of a product that will work? We need to go from the coax cable into the S-video connected to the projector. I have found several things that will go backwards of what I want but can't find anythign to go the right way.

 

Nope, found out we need a demodulator to get from teh coax signal to the composite. Also looks like it may be cheaper to buy a VCR than try to find an inexpensive demodulator.