[ntp:questions] Re: Naval Observatory Master Clock

David Schwartz davids at webmaster.com
Mon Jul 11 04:18:55 UTC 2005


"dicky" <abuse at hotmail.com> wrote in message 
news:42d1efff$0$5919$5a62ac22 at per-qv1-newsreader-01.iinet.net.au...

> If it is time interval that you need to calibrate, and not time of day, 
> then I recommend that you get a GPS synchronisation reference receiver.
> The accuracy of these sync sources are traceable to NIST, and are only one 
> step down from a caesium reference oscillator.
> A caesium oscillator would cost you about $45k USD, a telco spec 10MHz GPS 
> derived oscillator can be bought for around $3k USD.

    GPS devices with time of day traceable to NIST that can give you one 
microsecond accuracy are available for about $150 or less. With a dedicated 
Pentium PC, you can get a timestamper that's accurate to 5 microseconds or 
so with very little difficulty.

    DS





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