[time-nuts] Re: Long term ADEV of 5071

[Magnus Danielson]

Anders,

I am surprised to find that hydrogen masers was so dominant these days.
It only shows that the ALGOS improvement that handled the linear drift
that allowed their inclusion have been very effective and should have
improved the stability.

I am also surprised to find my local NMI SP clocks in as fourth weighted
laboratory. I should rig up so they have another maser to measure.

Cheers,
Magnus

On 2021-03-28 15:03, Anders Wallin wrote:
> FWIW here are plots of TAI-weight from the 'w' file for 2021.01. The
> 5071A's are at most 8%. Masers are >87%.
> These sum up to ca 95% - not sure where the missing 5% is..
> Going back to much before 2014 might show larger weight for the 5071As - I
> can post python code for the figures if someone is eager to try...
>
> AW
>
>
>
> [image: TAI_weight_clockype.png][image: TAI_weight_lab.png]
>
> On Sat, Mar 27, 2021 at 4:03 PM Demetrios Matsakis via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
>> I’ve attached an old paper of mine, from PTTI-2000.
>>
>> I’ve also attached the latest BIPM file of TT.  If you want long-term
>> stability it is best to use that file to compute TT-EAL and TT-TAI and then
>> re-reference the clock data you get from the BIPM.  The BIPM algorithm for
>> EAL/TAI/UTC changed in 2014 so if you stick with TT you re fine.  Since it
>> is computed every 10 days, you might want to spline-interpolate to get the
>> in-between points.  Or just interpolate.
>>
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