[time-nuts] First success with very simple, very low cost GPSDO

Hal Murray hmurray at megapathdsl.net
Fri Apr 11 04:03:07 EDT 2014

csteinmetz at yandex.com said:
> (Note that a 256 cycles per second error is 51 PPM at 5 MHz.)

You need a bit for the sign.   That leaves only 25.6 PPM error from nominal, 
51.2 peak-peak.  Half that at 10 MHz.

> In the real world, you should  be able to trust that any oscillator that is
> chosen for a GPSDO will  free-run within 1 PPM when it is warmed up, and
> that your PPS will  always be within 1 PPM, as well. 

Why?  The original goal was low cost.  I could easily believe that an 
inexpensive oscillator would be off by more than 1 PPM.

These are my opinions.  I hate spam.

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