[time-nuts] Line Frequency

Tom Van Baak tvb at LeapSecond.com
Mon Feb 10 14:29:56 EST 2014

> Let’s say you use a magnetic pickup loop.

> Ok, how about a capacitive pickup.


Good ideas. And extracting time from 60 Hz would be revenge for all the 60/120 Hz hum we've heard from PA systems our whole lives. Turning a problem into a solution is always satisfying.

Brooke -- IIRC some watch or clock company had a patent on calibrating a wristwatch crystal against AC hum. I read it once but can't find it now. Can you hunt for it?

While you're searching you'll run across the art of using mains frequency as a forensic tool. We discussed this on the list a while ago. Quick links are:


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