powersupply freq in sync with atomic clock?? .for what purpose?

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"Give a man a fish, and he will eat for a day. Teach that man to fish, and he will eat for a lifetime."

 

So you can accurately feed clocks from the mains frequency - it's been like that for many, many decades (although originally they didn't use the atomic clock signals).

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Hi Folks,

New here - Thanks for a great forum.

Electric companies used to guarantee frequency, but not voltage (hence brown-outs and such).

The frequency from the mains should be extremely accurate - at least that was the case 15 yrs ago - I wouldnt see any reason for them to change that as so much equipment relies on on mains frequencies'.

Neon

 

Absolutely, the only thing that is stable and accurate in the main power is the frequency.

Nigel, please explain me how you will syncronize line frequency to atomic clock? You know that you output 49.95Hz for 1 hour during the day so you will output 50.05Hz for 1 hour during the night so that all clocks can catch up during the night?? Sorry but that's the first verrrrrrry verrrrrrry strange thing I read from you .
Maybe your mistaken by the fact that most atomic clocks, atomic wristwatch (I have one for over 13 years now, never had to change time) and other atomic stuff are syncronising during the night (according to the book from my wristwatch 3 AM) to their transmitter. This has nothing to do with power line frequency.

That was also one of my first µP project, DCF77 atomic clock decoder on 2*16 characters LCD. All runs on main power so I don't even have to change a battery like Rolf suggested .

Please guys, never doubt about it, line frequency is one of the most stable things in modern world.

 

I've no idea how it's actually done these days?, but in the past they had two large 'clock type' displays, one showing the time from an atomic clock (presumably from Rugby?), the second showing the time from the AC mains.

During the night they would either speed up, or slow down, the generators until the clocks read exactly the same time - bear in mind the difference was only likely to be seconds, the UK electrical system is exceptionally good anyway.

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