[time-nuts] FRSc RB lamp experiment

paul swed paulswedb at gmail.com
Sun Feb 13 22:47:55 UTC 2011


Who would have thought a seriously leaky cap c7 on the input of U1a pin 3.
Roughly 10K ohm.
System is running at 1.6 x10^11. See if it hangs in there. Lamp is actually
going higher in voltage at 8.2 V. All in all a good experiment.
Regards
Paul.

On Sun, Feb 13, 2011 at 1:46 PM, paul swed <paulswedb at gmail.com> wrote:

> Startup circuit looks like a bad op amp used as a comparator. U1 section a.
> This is a LM 158. I have a LM 148 on hand suspect they are different in
> temperature quality. So will look it up and see. This is a common op amp so
> if the 148 does not work for some reason any numbers of more modern ones
> will. Accept one issue its a T08 can. What pin was 8? ;-)
> Regards
>
>
> On Sun, Feb 13, 2011 at 1:24 PM, Magnus Danielson <
> magnus at rubidium.dyndns.org> wrote:
>
>> Dear Paul,
>>
>>
>> On 13/02/11 18:50, paul swed wrote:
>>
>>> Magnus it indeed does look very good.
>>>
>>> I have re-assembled the various boards and the system locked up as normal
>>> after the warm up period. I do indeed have a failure in the lamp control
>>> startup crkt.
>>>
>>
>> My R&S does not have a startup circuit, so I can't help on that particular
>> detail. I'm sure you will debug it yourself.
>>
>>
>>  The reference after warm up and adjusting the c field is down in the
>>> 1x10-11
>>> area. Anyhow I adjusted the c field and the systems not fully assembled
>>> nor
>>> has it really been stabilized long enough. Was simply curious so I do not
>>> think this is really a very accurate assessment. Especially since this is
>>> time-nuts territory.
>>>
>>
>> At least it proves that you are up and running at least, modulus quirks.
>>
>>
>>  So next steps is to let the unit cook in or maybe I will further assemble
>>> it
>>> and troubleshoot the startup crkt. Add the unlock counter. (A pedometer
>>> and
>>> opto coupler) and let the system run for a long while perhaps a week or
>>> so
>>> to see what really happens.
>>>
>>
>> Sounds like a plan.
>>
>>
>>  Thanks for your guidance and help Magnus. Who would have thought there
>>> was a
>>> recovery technique for FRS-c RB references.
>>>
>>
>> Happy to help. Happy to learn of your progress! Happy to hear I
>> contribute.
>>
>>
>> Cheers,
>> Magnus
>>
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>
>



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