I grew up just a few miles from WWV. When I was a teenager I had an electronics lab, and the most reliable noise in the circuits I built was the WWV signal. I

I grew up just a few miles from WWV. When I was a teenager I had an electronics lab, and the most reliable noise in the circuits I built was the WWV signal. I could take a diode, a length of wire and a speaker and know the exact time, no tuning necessary :-)