[osidak]

I use both on my Dish receiver at the same time - RCA to my receiver and s-video to my DVD recorder.

Set it up this way so I could record a show to DVD while watching a DVD.

Now if I ran the s-video to my receiver and rca, the rca inputs would be disabled. I would prefer to run s-video as it is a better signal but I was having issues with movies that would have very dark scenes confusing the receiver (thought it had no signal) and getting a blue screen when using s-video.