[time-nuts] NMEA Time

[Hal Murray]

james.p.lux at jpl.nasa.gov said:
> I don't think the oscillator quality in the typical PC is good enough
> to ever get nanoseconds, even with tons of tweaks and temperature
> compensation, etc.  The short term variability/phase noise is too
> high.  

> Microseconds, I think you could do. 

Yes, mostly.

PCs have two nasty disadvantages in terms of time keeping.

One is that the CPU clock is typically using spread spectrum to make the EMI 
shielding (a lot) easier.

The other is that the temperature at the crystal depends (a lot) on what the 
CPU is doing.



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