[ntp:questions] Loop Frequency and Offset

Thomas Laus lausts at acm.org
Tue Sep 27 12:58:53 UTC 2011


On 2011-09-27, Miguel Gon?alves <mail at miguelgoncalves.com> wrote:
> One had 180 ppm sand the other 46 ppm without fiddling with machdep.tsc_freq
> sysctl variable. After the correction I am getting -0.041 ppm for the first
> and -0.045 ppm for the second.
>
>
> Embedded machines running NanoBSD and they don't do anything else besides
> running NTP. They sit in a temperature controlled room at 20 ?C. Power
> management has been disabled. I checked the BIOS and did not see any
> reference to spectrum clocks.
>
Miguel:

There are a lot of links off of the leapsecond.com of home made
methods that improve clock stability.  I am using one of these PC
clock crystal replacement boards in my Intel Atom.

http://www.leapsecond.com/ptti2003/index.htm

http://www.tapr.org/~n8ur/Clock-Block_Manual.pdf

Installation is meant for someone with better than average soldering
skills.  This device replaces your motherboard clock crystal with
something that is more stable.

Tom


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