[time-nuts] Setting up PRS10 with M12+T GPS

Azelio Boriani azelio.boriani at screen.it
Wed May 2 21:29:44 UTC 2012


I'm so sorry for the inconvenience but I wasn't aware of this CTIA supreme
piece of test equipment... now I know. This CTIA is mainly intended for
very high speed serial interconnect and Gigabit ethernet test.

On Wed, May 2, 2012 at 11:18 PM, Tom Knox <actast at hotmail.com> wrote:

>
> I cannot believe my Guidetech GT4000 was left off your list.
>
>
> Thomas Knox
>
>
>
> > Date: Wed, 2 May 2012 22:11:25 +0200
> > From: magnus at rubidium.dyndns.org
> > To: time-nuts at febo.com
> > Subject: Re: [time-nuts] Setting up PRS10 with M12+T GPS
> >
> > On 05/02/2012 10:03 PM, Azelio Boriani wrote:
> > > You don't have a Cs reference but you have a GPS: in the long term it
> is
> > > the same. By using a TIC (your preferred: HP5370B, HP5372A, SR620,
> PM6680,
> > > PM6681, HP53132A, Racal 2351, Yokogawa TA720, PICTIC II, Wavecrest
> DTS275
> > > [SIA3000?] and others) keep track of the GPS PPS vs. the PRS10 PPS.
> >
> > Considering the M12+T PPS noise, you won't need anything stellar. A
> > PICTIC II will do just fine... or if you trust the PRS-10 readings, run
> > from that.
> >
> > What would make this better would to use a sawtooth-correction to PPS
> > delay setup, as the PRS-10 measurement resolution will be about on par
> > with that. Would lower the effects of hanging-bridges, even if one
> > suffers less when dealing with a rubidium.
> >
> > Adjust the PRS-10 PLL bandwidth/time-constant, the default value is most
> > probably not optimum, you can go further up in time. Do check the manual.
> >
> > Cheers,
> > Magnus
> >
> > > On Wed, May 2, 2012 at 9:46 PM, Jerry Mulchin<jmulchin at cox.net>
>  wrote:
> > >
> > >> I need some guidance from the collective.
> > >>
> > >> I just finished rebuilding my PRS10 lab standard and it is now using a
> > >> M12+T GPS module.
> > >> I have completed my site survey and it is now in "hold position mode",
> > >> TRAIM is enabled
> > >> with 500ns alarm setting and the 1PPS is enabled during non-TRAIM
> alarm
> > >> conditions.
> > >>
> > >> The PRS10 is set for default 1PPS steering, but all of the other
> > >> parameters are just as
> > >> I received the unit 5 years ago.
> > >>
> > >> My questions are these;
> > >>
> > >> 1.) Should I reset the PRS10 to its Default settings or just adjust
> > >> selected parameters to
> > >> align the unit for proper operation with the M12+T unit? And if that
> is
> > >> the case, what parameters
> > >> need adjusting?
> > >>
> > >> 2.) Are there any special settings, other than what WinOncore sets,
> that I
> > >> should make to the
> > >> M12+T unit?
> > >>
> > >> 3.) After all this is completed, how do I know that the PRS10 is
> properly
> > >> tracking GPS and
> > >> maintaining frequency accurately? I don't have a Cesium reference,
> but I
> > >> do have an un-disiplined
> > >> LPRO-101, but I don't think that really helps me determine frequency
> > >> accuracy.
> > >>
> > >> I will be adding the sawtooth correction eventually to the M12+T 1PPS
> > >> output, but observed
> > >> negative sawtooth with WinOncore shows +/- 14ns changes with some
> bridging
> > >> occasionally.
> > >>
> > >> While I don't ever want to claim NIST traceability, I would like to
> be a
> > >> close as possible, and I
> > >> guess that is the bottom line need here. So what else do I need to do
> to
> > >> get as close as possible?
> > >>
> > >> Thanks for any help.
> > >>
> > >>
> > >>
> > >>
> > >> Jerry Mulchin
> > >>
> > >>
> > >>
> > >> _______________________________________________
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> > >>
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