[time-nuts] Re: problem with Trimble Mini-T

[Magnus Danielson]

Hi Erik,

OK, that makes sense. That's fine. Thanks for the clarification!

I have yet to setup and test tinyPFA. Will be interesting to compare it 
to other measurement solutions.

Cheers,
Magnus

On 2023-11-07 07:29, Erik Kaashoek via time-nuts wrote:
> Hi Magnus
> The ADEV was a separate measurement using the 10MHz output of the 
> Mini-T against my most stable DOCXO using a tinyPFA
> Erik.
>
> On 6-11-2023 20:12, Magnus Danielson via time-nuts wrote:
>> Hi Erik,
>>
>> Really happy to hear you got hold of the issue, and happy that my 
>> little suggestions got you in the right track quick enough.
>>
>> With ADEV, do you mean the Lady Heather self-reports or that of a 
>> separate reference measurement?
>>
>> Cheers,
>> Magnus
>>
>> On 2023-11-06 16:47, Erik Kaashoek via time-nuts wrote:
>>> Hi Magnus,
>>> Thanks for telling me to check everything.
>>> I turned out to be leakage from another 10MHz source with an output 
>>> coax running close to the coax from the reference.
>>> To ensure the PLL worked correctly I first validated in open loop 
>>> mode the control range of the DAC, which turned out to have 10MHz 
>>> correctly centered in the middle of the DAC range.
>>> Then I enabled the PLL and after about 10 minutes the PLL was stable 
>>> and within 1e-10 of a Rubidium reference.
>>> The 0.1s ADEV without PLL active is just below 0.8e-11. With PLL 
>>> active the 01. - 100 s ADEV is at about 3e-11 which is good enough 
>>> for me. The active PLL ADEV can be further improved by making the 
>>> loop time constant longer if needed (it is now at 100s)
>>> Erik.
>>>
>>>
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