I have an HDTV connected with HDMI from a DISH Network VIP612 DVR Receiver. I want to split the coaxial connection from the DVR to my Hauppauge 1200 WinTV HVR-850 HDTV Tuner Stick. What splitter and coaxial cable (needs to transmit audio and video) should I get to make this a watchable TV on my computer?
I am confused, you say you want to split the coax but you aren't telling us what coax you are talking about.
And you want:
I don't think you can split the coax from the dish and feed it to your Hauppauge. Pretty sure it is just an over the air HDTV tuner, not a Sat receiver. If you could do this, you wouldn't need to pay Dish :)
If it is anything like Sky digital in the UK, this is not possible.
(Example based on Sky Digital) The two cables are each connected to a different output on the LNB (the part at the end of the dish) and it is not a one way signal - the box can only receive on either 11Ghz or 12Ghz then scan vertical or horizontal at once (so one of four).
This is why when you switch between some channels, it is instant and when you switch between others, it takes a little time as it has to refocus and tune.
The best thing you can do is buy a switch box so that you can send the signal to one of the other.
Alternatively, the best (but hardest) solution is to upgrade your LNB to one with more ports then run some new cable. Then you can use all your devices at once.