B.J., (or anyone) could you post a link to one of these DC-blocks?
I am unsure as to exactly what you are talking about and didn't find anything on any of the sponsors' websites that I was sure was the correct part, thanks.
here is one I googled....they run a couple bucks
F-Type DC Block Coaxial Coupler IR DC Voltage Block Female to Male 1 Pack for IR Over Coax Cable Systems F Connector Audio Video AC/DC Volt Blocking Connector, Part # Channel Master 7264: Oak Entertainment Centers and Home Office Furniture, TV Antenn
I like BJ bought a bunch from Radio Shack...got them on closeout