[time-nuts] Time Dilation tinkering

Bob Camp kb8tq at n1k.org
Tue Mar 21 20:25:31 EDT 2017


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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