[time-nuts] u-Blox ZED-F9T block diagram or timing knowledge available here?

[Michael Wouters]

Hello Tim,

There’s a TDEV plot here:
http://www.openttp.org/scripts/blog.php
PPS measurements were post -processed using the sawtooth corrections.

Cheers
Michael


On Tue, 7 Jan 2020 at 1:07 pm, Tim S <tim.strommen at gmail.com> wrote:

> Hi, first time poster, just getting into the time rabbit-hole.
>
>     I'm looking at building my own 10MHz double-oven + Rubidium standard
> for home-lab use, and I wanted to investigate GPS disciplining.  I read
> some remarkable work using Jupiter engines and a simple N/1000 and PLL, but
> with those receivers becoming much more outdated and higher precision GPS
> receivers now fairly cheap - I thought I'd try something new from uBlox to
> not repeat prior efforts.  I've gone all through every resource I can find
> online and on the uBlox forums, but there is a general lack of public
> information about the time and clock features of the u-Blox F9 engine.
>
>     Suffice it to say, there is a section in the integration manual where
> they elude the 1PPS signal is set to the closest one of 1023 edges - which
> seems to suggest a possible sawtooth phase noise creation.  Talking with a
> person "clive1" on the uBlox forum it sounds like the internal GPS engine
> >>MAY<< now running at 384MHz there sounds like a possibility to align a
> 1PPS edge to a much finer resolution clock which is closer tied to the GPS
> solution and thus less digital divider phase noise might be possible.
>
>     Does it sound like I'm way out in left field here?  Anyone have the
> luxury of more insight into the construction of the uBlox F9 GPS engine?  I
> don't mind spending a few grand on some factory new components to get a
> decent 10MHz standard, but I'm less interested in doing so if I'm not going
> to understand what's going on inside.
>
> Thanks in advance for responses,
>
> -Tim Strommen
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