[time-nuts] Checking Time difference between PCs

[David J Taylor]

From: Chris Albertson
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Simply using NTP on Windows will force the clocks to be without about .002
seconds.   That is about as good as you can do using Windows.
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.. although these performance graphs suggest that 50-250 microseconds can be 
achieved on Windows when run as stratum-1 servers with PPS syncing:

  http://www.satsignal.eu/mrtg/performance_ntp.php#windows-stratum-1

Performance /does/ vary with different Windows versions, and when you add in 
LAN, Wi-Fi, or even WAN synching your 2 milliseconds figure is not 
unreasonable, and it can be worse as seen on at least one PC here (portable 
Mercury synced over Wi-Fi).

  http://www.satsignal.eu/mrtg/performance_ntp.php#windows

Rex, there is little or no extra cost in using NTP as a stratum-1 server, 
the GPS receivers are readily available at low cost, and you may have a COM 
port header on your motherboard even if there is no COM socket at the rear.

Cheers,
David
-- 
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Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk