John, if you look back at the recent GPSDO discussion initiated by
"dandober" in hpaligent keysight group, you'll see a post by Leo Bodnar,
linking a Ublox model here
https://www.u-blox.com/sites/default/files/products/documents/LEA-M8F_DataSheet_%28UBX-14001772%29.pdf
I looked it up, and I recall the PPS timing spec is +/- 5 nSec. After I
studied it some, I replied back
"Thanks Leo, that's a great example of what I've been picturing. This is
from the data sheet, regarding the PPS output:
"After an initial phase of acquisition the time-pulse becomes
essentially jitter-free, generated coherently from the built-in
reference oscillator and guaranteeing an exact number of reference
frequency cycles between each time-pulse."
It looks like this is an implementation of what we've talked about here
before a few times, for saw-tooth error reduction. BTW I didn't call it
"1PPS" above, because it can be programmed for different rates - I don't
recall what they are.
BTW, did dandober ever sign up here?
Ed
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