[time-nuts] Range of Sawtooth values?
albertson.chris at gmail.com
Sun Mar 9 23:39:36 EDT 2014
On Sun, Mar 9, 2014 at 7:11 PM, Jim Miller <jim at jtmiller.com> wrote:
> Just curious as to the range of sawtooth values that are typical for timing
> What's the maximum correction needed?
I just recently looked at this at least for the Oncore series of
receivers. The magnitude of the sawtooth seems to scale with the
accuracy of the PPS. In other words the newer and better receivers
have both a more accurate PPS and a smaller sawtooth correction. It
makes sense. If less correction is needed the magnitude of the
correction is less. The M12 user manual hints at why, they say the
newer receiver runs on a faster internal clock.
I think the sawtooth correction is always larger than the one sigma
error. In other words if you ignore it, then that is the major error
in the PPS.
Beware of some very old data on this, made back when the UT was new.
They still had SA turned on back then.
Redondo Beach, California
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