[ntp:questions] refclock on Windows graphs

Unruh unruh-spam at physics.ubc.ca
Tue Mar 17 19:22:12 UTC 2009

"David J Taylor" <david-taylor at blueyonder.neither-this-bit.nor-this.co.uk> writes:

>Dave Hart wrote:
>> Unusually for me, the configuration and code on my reference clock
>> test machine has been static for the last two days UTC.  I've posted
>> loopstats and graphs for that period on http;//davehart.net/ntp/
>> refclock/
>> Cheers,
>> Dave Hart

>The program which Dave used to produce his graphs from loopstats data is 
>available in an unsupported beta version here:

>  http://www.satsignal.eu/software/net.htm#NTPplotter

>I'm running Dave's updates to ntpd.exe, with his serial PPS driver on an 
>old 1.9GHz Pentium 4 PC, and seeing average jitter values around 2.3 
>microseconds (when fed from a 1 microsecond GPS).  The offsets are still 
>more than I would like, being typically from -100 to +200 microseconds, as 
>temperature varies throughout the day, producing almost 3ppm peak-to-peak 
>frequency variation.

Gads, those offsets are huge. And 3PPM variation is also pretty big. 


More information about the questions mailing list