[time-nuts] U-blox teaser

[Bob kb8tq]

Hi

Would not “absolute” timing be referenced to UTC? (or something similar)

Bob

> On Feb 26, 2021, at 5:37 PM, ed breya <eb at telight.com> wrote:
> 
> 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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