[ntp:questions] how to have offset < 1ms

nemo_outis abc at xyz.com
Thu Apr 15 00:24:01 UTC 2010


John Hasler <jhasler at newsguy.com> wrote in 
news:874ojdmx12.fsf at thumper.dhh.gt.org:

> Richard B. Gilbert writes:
>> One possible solution is using radio controlled clocks.  I have a
>> wristwatch that uses a radio signal to correct itself.  I also have a
>> wall clock that does the same.  Both work very well.
> 
> They won't work very well inside a steel ship or far out to sea.  They
> use VLF (60kHz/77kHz) signals that only propagate a thousand miles or
> so and not at all through steel.
> 
> In any case it is clear that the ACEB box can provide the performance he
> needs if he can only communicate with it.  He has a networking problem,
> not a timekeeping problem.


Spot on!

Regards,

PS  Which means we can now dispense with much of the speculation regarding 
GPS and its putative implementation, howsoever configured.




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