Anyone know how to get Stereo sound on a TV in a link room that is using a SAT/DTV source from a main room. Selecting Link-AV and SAT/DTV activates stereo, but how do I get stereo by default ?

You can't... You have to do it manually each time.

If the Link TV does not have its own SAT/DTV source, you can call the main room SAT/DTV source directly by pressing SAT/DTV or AV SAT/DTV when you want the stereo.

You need to press LINK only in the a source with the same name is also present on the link TV. 

 P.