[time-nuts] CW12-TIM vs M12M and the world

[Azelio Boriani]

We (that is my company) use the CW12-TIM (NMEA version) and its PPS wonders
as usual, nothing different from a uBlox LEA-5T or the M12M.

On Thu, Mar 29, 2012 at 9:32 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> >> The sawtooth error on the Motorola M12+ is about +/- 25ns, while the
> >> CW12-TIM has a sawtooth error of +/- 2 ns, so correcting for the
> >> sawtooth error is not as critical with the CW12-TIM.
>
> > The first claim
> >> The sawtooth error on the Motorola M12+ is about +/- 25ns
> > is correct but are you absolutely sure that the second claim is correct
> > too?????
>
> > It would mean a factor >10 improvement of the CW12-TIM against the M12
> which
> > is hardly believeable.
>
> The 25 ns probably comes from period of the the free running clock they are
> using.  It doesn't seem unreasonable to me to get 10x better if they use a
> GPSDO for the local clock so they can get the PPS edge right where they
> want
> it.
>
>
>
> --
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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