[time-nuts] PRS10 Information and help needed

Arnold Tibus arnold.tibus at gmx.de
Wed Feb 28 17:27:40 EST 2018


Hi Mike,

very interesting what you are saying, I remember long months ago that I 
prepared the RbO for the calibration with the 1 PPS from Thunderbolt. 
Then I stored it away until today ...
Perhaps this I should look after, but today it is already too late ...
Would be great, if my nice box would do the job still some or better a 
lot of years more!
Unfortunately I have actually also problems with my Thunderbolt output 
of the 1 PPS. So, it is hard to be a timenut!

Thank you, regards,

Arnold

Am 28.02.2018 um 23:16 schrieb Mike Cook:
> Hi Arnold,
>    It looks like your oscillator is locked to the rubidium and it is configured to lock to an incoming PPS sig, but the TT value is null, so maybe you have forgotten to connect the GPS? Or maybe to the wrong connector? Check the PPS in to see if you have a good signal.
> I don’t know about the ranges of the ad5,ad9 values. Yours are a little  lower than the one I have been looking at?
> regards,
> Mike
> 
> 
>> Le 28 févr. 2018 à 22:14, Arnold Tibus <arnold.tibus at gmx.de> a écrit :
>>
>> Hello Michael and Tom, thanks for the quick reaction!
>>
>> Of course I did already think that the rubidium cell doesn't work any more, but then I was astonished after more than 1 hour running how precise the output frequency is and I could not see a drift beyond the natural noise/ fluctuations which I can see as well with Tr. Thundelbolt. I did not yet look deeper e.g. observing the longtime behaviour nor did I open the box (yet), anyway I don't know much about the electronic internals.
>> I have running the RbMon and looked to the data list which I have annexed. It doesn't explain much for me therefore I am asking for help and support to find possible solutions, there are so much excellent experts out here.
>> I am worried that in fact the Rb capsule went over the Jordan ... perhaps it can be revitalized but I have no experience with it.
>> I doupt a bit the lamp heater control value etc., ad5 to ad9.
>> What is the range ... ? How shall one understand these and other values?
>> But finally, how can one improve the situation?
>>
>> I am open for all good hints, instructions and ideas! (I am sure that there are other timenuts also interested ;-)  )
>>
>> many thanks in advance
>>
>> Arnold
>>
>> Am 28.02.2018 um 21:02 schrieb Michael Wouters:
>>> Hello Arnold,
>>> A frequency offset of a part in 10E-11 still sounds healthy to me. I wonder
>>> whether there is some kind of electronic problem?
>>> I have run 40 or so PRs10s and the lamp is the usual bit that dies.
>>> If you hook up a computer to the RS232 port, there are lots of diagnostics
>>> available.
>>> Cheers
>>> Michael
>>> On Thu, 1 Mar 2018 at 5:47 am, Arnold Tibus <arnold.tibus at gmx.de> wrote:
>>>> Hello fellow timenuts,
>>>>
>>>> for my old PRS10 I need some information and help with technical
>>>> informations.
>>>> I have this item bought quite some years ago and I have manufactured an
>>>> interface cable with the special connector last year. Did work fine.
>>>> Taken out of storage I do get anymore the lock and PPS signal out.
>>>> The 10 MHz output does look very good, the unloaded sine voltage is 2.8
>>>> Vpp and the frequency is very precise and stable very close to the
>>>> trimble thunderbolt GPS-out signal at abt. 10E-11.
>>>> In the annex you can see the data output with more delailed info.
>>>> Can somebody tell me more, is the life at the end and what and how can
>>>> be done to revitalize this nice time machine? How much time more is
>>>> expectable?
>>>>
>>>> kind regards,
>>>>
>>>> Arnold
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> 
> "The power of accurate observation is commonly called cynicism by those who have not got it. »
> George Bernard Shaw
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