[time-nuts] Caveats on Allan Deviation with ultra stable oscillators

Bob Camp kb8tq at n1k.org
Fri May 30 15:24:51 EDT 2014


Hi

Rubidium ensemble? That would have been quite a while back. They have been running on long tube Cs standards for quite a while. 

Bob

On May 30, 2014, at 2:03 PM, Tim Shoppa <tshoppa at gmail.com> wrote:

> What did NIST do with its Rubidium ensemble before they got the cesium fountain?
> 
> Did they break one of the rubidiums off the ensemble, maybe in a
> different room with different HVAC, and look at the one vs many?
> 
> Would that be useful for OCXO's, measuring one OCXO against an ensemble?
> 
> Tim N3QE
> 
> On 5/30/14, cdelect at juno.com <cdelect at juno.com> wrote:
>> Hi,
>> 
>> I usually don't use drift removal as I want to see the effects of drift!
>> 
>> The effects of oscillators locking together are very apparent on both the
>> phase and AD plots when using a DMTD system. There was no indications of
>> such locking!
>> 
>> My point was that if you are measuring ultrastable Quartz oscillators
>> against each other the AD at the higher Tau will not reflect the true
>> stability of the oscillators.
>> 
>> Only a Maser or high performance Rubidium (HP5065A) will reveal the true
>> behavior.
>> 
>> Cheers,
>> 
>> Corby
>> 
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