[GreenKeys] Accurate clocks...

[Henning DF3OE]

Standard time for almost whole central Europe is generated just a few
kilometers from my home here in Braunschweig (Brunswick).

http://www.ptb.de/en/org/4/44/_index.htm

The signal is being transmitted over a long wave transmitter near
Frankfurt on 77.5 kHz
and receivable almost all over Europe, even by wristwatches...

73,
Henning  DF3OE
www.teleprinter.net




2009/1/9 Don Robert House <Packard42 at gmail.com>:
> AHH yes now I recall...  Cesium.
> That is the element that is accurate to one second over 400 years.
>
> Somewhere here in my books on synchronization I have the different
> levels and accuracy of clocks.
>
> Rubidium is almost affordable these days.
>
> As we say in the Telephony business,  Timing is Everything!
>
> Don
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