[time-nuts] U-blox teaser

[John Ackermann]

That's how I'd interpret it.

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On Feb 26, 2021, 7:42 PM, at 7:42 PM, Bob kb8tq <kb8tq at n1k.org> wrote:
>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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