[time-nuts] Time Dilation tinkering

Scott McGrath scmcgrath at gmail.com
Wed Mar 22 09:27:41 EDT 2017


Ive been playing with one for work for the past few weeks and the Nor Easter which blew through NE did not affect short term ADEV with Tau < 1000s and that had a signficant drop in local barometric pressure for several hours

As to long term controlled studies no have not had opportunity to do so yet so that was an off the cuff observation based on the storm and not scientific data.

I'd be interested in any other observations around the same time though if anyone else is running a CSAC in NE


> On Mar 21, 2017, at 8:25 PM, Bob Camp <kb8tq at n1k.org> wrote:
> 
> Hi
> 
> Ummm … errrr …. it’s a gas cell standard. I’d bet there is a pressure effect.
> 
> Bob
> 
>> On Mar 21, 2017, at 7:01 PM, Scott McGrath <scmcgrath at gmail.com> wrote:
>> 
>> Noted
>> 
>> However CSAC not subject to barometric effects as Rb units are
>> 
>> Content by Scott
>> Typos by Siri
>> 
>>>> On Mar 21, 2017, at 4:18 PM, jimlux <jimlux at earthlink.net> wrote:
>>>> 
>>>> On 3/21/17 12:51 PM, Scott McGrath wrote:
>>>> Or perhaps use the Symmetricom CSAC ...
>>>> 
>>>> Relatively expensive but might work
>>>> 
>>> 
>>> 
>>> The CSAC  is 8E-12 AVAR at 1000 seconds, comparable to a Rb.
>>> 
>>> 
>>> See also http://tycho.usno.navy.mil/ptti/2011papers/Paper27.pdf
>>> which shows a bit better performance (3E-12 @ 1000s), but the best performance appears to be at 10,000 seconds.
>>> 
>>> 
>>> but don't you need better?
>>> Attila wrote> You will need a stability 1e-14 @1d.
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