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

[Tom Knox]

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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