My oregon scientific indoor outdoor weather station with atomic clock just stopped picking up the outdoor readings, it won't switch to that channel any longer. tried removing and reinstalling the battery, set it next to the outdoor receiver, nothing.

I had the same problem, Since the outside temp wouldn't read, I figured it was the outside unit batteries. Went through half a dozen AAA batteries and wouldn't read. It was the indoor unit. Had the same bats I installed 3 years ago. DUH! Replaced the AAA, and all was well. When the inside batteries die out, it has just enough juice to read indoor temp, but not enought to sense exterior signal.