[ntp:questions] NTP absolute accuracy?
unruh-spam at physics.ubc.ca
Sun Nov 1 23:52:17 UTC 2009
"David J Taylor" <david-taylor at blueyonder.not-this-bit.nor-this.co.uk.invalid> writes:
>"Unruh" <> wrote in message news:vCjHm.50153$Db2.9407 at edtnps83...
>>>UK 60KHz radio time signal.
>> Ah, OK. Its accuracy is probably not much better than a few msec I
>> GPS is a few usec. Since the network gives accuracies of better than a
>> few ms, MSF
>> is not a good way of testing the accuracy of network set clocks.
>At source, it's recently been within about 10 microseconds:
Sorry, at 10usec, the distance away of the transmitter must be less than 3 km.
Also your system needs to see the start of the tone to 10usec which means that the
tone would have to be about 1MHz which is a bit beyond audio.
>In the field, the accuracy will depend on the receiver you use, the
>propagation, and the quality of signal you have. A few milliseconds is
>probably a fair estimate, although it would be interesting to see some
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