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

[Bob Camp]

Hi

It looked good to me. It’s certainly at the top of the “bang for the buck” list.

Bob

> On Nov 7, 2023, at 12:25 PM, Erik Kaashoek via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> 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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