[time-nuts] u-blox LEAH M8F

[Scott Stobbe]

There was an interesting comment in the Lea-m8f datasheet,
"In strong signal clear-sky applications the best time pulse consistency
between neighbouring receivers is
achieved when using a single GNSS because of the small time offsets between
different GNSS systems. "


On Thu, Dec 22, 2016 at 8:01 AM John Haine <john.haine at haine-online.net>
wrote:

> I was slightly imprecise in my previous posting about ubx timing modules
>
> and a few people have raised queries in the list or by email.
>
>
>
> What I should have said is that this module is designed as a precise
>
> low-noise /frequency /reference so it directly generates the 30.72 MHz
>
> needed in LTE infrastructure from a GPS disciplined VCTCXO.  As I
>
> understand it, the usual 10 MHz output is digitally generated and
>
> jitters, so can't be used as a reference in high performance radio
>
> systems.  One could use a phase-locked synth to multiply up from the 1
>
> PPS signal but given the large ratio needed this is prone to generating
>
> its own noise.  The M8F does it all internally and is therefore
>
> preferred if what you want is a low noise frequency reference, though
>
> its frequency may not be ideal if for example you wanted 10 MHz - you
>
> could get 10.24 MHz by dividing by 3 but 10 MHz is trickier.
>
>
>
> --
>
> John Haine
>
> 9 Parkway
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>
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