Do you use a set-top box? Does it have analog outputs? Composite video? Component video? S-Video? Use those to connect to your vcr. If you have a coax output from your STB that may work when connected to your vcr, but only use this as a last resort. It's easy enough to test. The analog outputs (composite/component/s-video) will definitely work, assuming your vcr has these inputs -- it should have at least one of these.