[time-nuts] Building a GPSDO & trouble using Jupiter-T

Bob Camp lists at rtty.us
Mon Jan 30 20:30:37 EST 2012


Hi

Aging tends to be bidirectional ( equal probability  positive or negative within a group of Rb's ). That would make it tough to pre-estimate. 

Bob



On Jan 30, 2012, at 1:40 PM, Chris Albertson <albertson.chris at gmail.com> wrote:

> On Mon, Jan 30, 2012 at 9:16 AM,  <EWKehren at aol.com> wrote:
>> With a Rb we are talking loop time in excess of 20 minutes. Any thing other
>>  than digital is out of reach. To day I should get my second Rb and I will
>> put it  on aging test.
> 
> My guess about why you don't see aging or so little of it is that
> maybe some engineer at FEI already did the test and added firmware in
> the FE5680 to correct the output for estimated aging.  So what you are
> measuring is the difference between true aging and the unit's internal
> aging model.
> 
> Trimble does something like this in holdover mode, the controller
> compensates for the OCXO's estimated aging
> 
> Chris Albertson
> Redondo Beach, California
> 
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