[time-nuts] Checking Time difference between PCs

David J Taylor david-taylor at blueyonder.co.uk
Fri May 24 07:40:04 EDT 2013

From: Chris Albertson
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.

.. although these performance graphs suggest that 50-250 microseconds can be 
achieved on Windows when run as stratum-1 servers with PPS syncing:


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).


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.

SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-taylor at blueyonder.co.uk 

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