I have a Comcast DCX 3400 DVR box on my first floor that I have connected to an HDTV with HDMI. Everything works fine.
What I want to do is be able to watch the same program the HDTV is watching (even DVR'ed shows) in my 2nd floor bedroom. That room only has a standard cable RG6 drop into it and no real way to fish any other lines in. My idea was to use the RF Out port of the cable box to run down to my switchboard of cable drops and back up to the bedroom. Sure it won't be HD or anything, but I'm fine with that.
So I tried a test setup in the room with the cable box and plugged the RF Out into another TV. The picture looked pretty good - actually better than I expected. But there was no audio at all. I made sure the volume was up on the TV and searched everywhere in the DCX 3400 menus (including the power-off menu) to see if there was some muting somewhere, but I couldn't find anything.
I then tried it on another TV with the same result. No sound.
I tried removing the HDMI output of the cable box and the coax digital audio out, so that the only things hooked to the cable box are the power, the RF In and the RF Out. Still no luck.
I tested the Component Out of the cable box and that worked perfectly. Beautiful HD and full sound. Unfortunately, as I said, I really need the RF Out to work to get it to my bedroom.
It seems like I'm missing something simple. Any ideas what it could be?
I also have a Cat5e drop at both locations. I know there are some solutions out there run run A/V over Cat5e, but none have sounded all that reliable and are in general expensive. If I could hack something like Composite onto those lines (by wiring the cables out the RCA plugs), I might consider doing that as well. But I'm not sure if that would work or not. Any advice there would be appreciated as well.