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

[Erik Kaashoek]

Magnus,
I know both John Ackermann and Bob did extensive measurements with the 
tinyPFA and compared it to other phase measurement tools.
Erik.

On 7-11-2023 16:53, Magnus Danielson via time-nuts wrote:
> 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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