[time-nuts] First success with very simple, very low cost GPSDO
hmurray at megapathdsl.net
Fri Apr 11 08:03:07 UTC 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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