[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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