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

Azelio Boriani azelio.boriani at screen.it
Wed May 2 22:39:48 UTC 2012


Yes, the E1740A it is a VXI plug-in like the Racal 2351. I have the Racal
and the VXI C-size small mainframe E1421B.

On Thu, May 3, 2012 at 12:31 AM, Pete Lancashire <pete at petelancashire.com>wrote:

> Or  my E1740A :-)
>
> On Wed, May 2, 2012 at 2:18 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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> >>
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