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

Pete Lancashire pete at petelancashire.com
Wed May 2 22:31:56 UTC 2012


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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