[ntp:questions] Remarkably good CPU oscillators?

Richard B. Gilbert rgilbert88 at comcast.net
Sun Nov 5 17:00:51 UTC 2006


shoppa at trailing-edge.com wrote:

> I have a tiny mini-ITX motherboard that has served as a stratum-1 for
> several years.
> 
> It sits in the basement, so no radically wild swings in temperature or
> other environmental factors.
> 
> Still, this morning when I look back at a few years of loopstats, the
> oscillator in this thing is remarkably, and maybe unbelievably, stable.
> It has stuck in the -2.5 to -5.5 PPM range over the past two years, and
> in a typical daily swing it might go up and down by a 0.5 PPM.
> 
> Is this statistic just "too good to be true"? Or did I luck out when I
> bought this box many years ago?
> 
> It has two refclocks available, wwv_audio and a Z3801A (via hpgps and a
> PPS nanokernel), and cross-checking between the two I believe them
> both.
> 
> Tim.
> 

If this oscillator is "free running" it is, indeed, remarkable.  If it 
is GPS disciplined it's what you should expect!




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