[time-nuts] Need Time Help
David J Taylor
david-taylor at blueyonder.co.uk
Tue Oct 4 03:01:51 EDT 2016
Hello to the List:
After a long and bitter struggle with XP and WIN 10, I am writing to ask
for some help in solving some problems we have been having in our attempt
to establish a very accurate time reference for use in EME activities.
We are hoping to achieve less than 5ms deviation, although anything below
15ms will be adequate for now.
I ask for advice on how we can use the above gear or other gear or other
software to have our setup deliver better than 15ms accuracy.
Ultimately we want sub-millisecond accuracy.
Any help will be very much appreciated. Thanks in advance for anything you
You can use a GPS puck or equivalent with PPS output to get the sort of
accuracy you need. I've written up some notes here:
and you can see the results here for Windows 2000 and Windows-10 systems (I
no longer have an XP system with GPS/PPS reference):
0.5 ms is easily achieved, although it's desirable to keep the systems
running 24 x 7 (or started well in advance) and as constant a temperature as
you can reasonably achieve helps.
If you want, you could also build or buy an external NTP reference based on
GPS/PPS, such as a Raspberry Pi or the LeoNTP server, and then sync the PCs
over the LAN or Wi-Fi, but the results won't be as good as a PPS input
direct to the PC:
I haven't read your long post in detail, so I hope the above suits.
SatSignal Software - Quality software written to your requirements
Email: david-taylor at blueyonder.co.uk
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