Looking for an older movie, 80s or early 90s that was scary and had spritiual overtones. The idea was scientists figuring out how to listen to and see information being sent back in time to warn them. Ends up one of the crew was the evil one in the future.

Sounds a bit like Prince of Darkness.

I don't think so, the plot was more scientific as the future scientists figured some time and space location to beam the information to. I did n't see that in the Prince of Darkness by King

Maybe Event Horizon (1997) (http://www.imdb.com/title/tt0119081/) , it's from the late 90's though.

Oh, good call. I'd successfully purged all memory of that movie from my brain.

Ha ha! Sorry Purukivel I didn't mean to remind you of any unpleasant memories.

The movie could possibly be Sphere (1998) (http://www.imdb.com/title/tt0120184/) , it seams closer to your description gwilber. Here's a link to a more in depth description as well http://en.wikipedia.org/wiki/Sphere_(film)

Sorry, it was before either of those came out as movies. Neither was communication through time via some radio signals propagated through space. But good try.