I just purchased the Cateye Vectra and installed it as per the instructions, and set the time & tire size, but it doesn't seem to pick up the sensor. I put a new battery in the sensor but it still doesn't pick it up. It's well within the range. 70cm.
Is there something I need to do that I'm not? Is there syncing process I overlooked?
Any and all help appreciated.

Try the rest process on the speed sensor. it is under the menu button.. I think page 17 in the instruction manual.
Drew