In message <[EMAIL PROTECTED]>, Dr Bruce Griffiths writes:

>One can glean some idea of how this may best be done by looking at how 
>NIST, USNO, NIST, PTB, etc pipe the standard frequencies from their 
>various atomic standards around. Current designs for modern radio 
>telescope arrays such as the Atacama millimeter array and upgrades of 
>various existing instruments give a good indication of current best 
>practice for such instruments that require state of the art timing 
>stability.

There used to be a couple if interesting tidbits on timing.com's homepage
about using fibers for clock signals.


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