There's a radio transmission from the atomic clock at Rugby, Maplin used to sell kits for it. You can also get accurate time from a GPR receiver or module.
Yes I know about the radio transmission from Rugby. Just wondering how I'd implement a circuit to receive it and code my PIC to interpret the signal. I'm trying to look for alternatives to a zero-crossing detector or a crystal. This seems like a viable one, so I'm essentially looking for resources on it.
I am googling right now, but if someone has info on what kind of signal it is, whats the modulation and what kind of receiver circuit it needs, it would be nice if they post it up