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

EWKehren at aol.com EWKehren at aol.com
Mon Jan 30 13:47:02 EST 2012


What they do does not make any difference to us, what is important how  
often we have to change the tuning word to meet our requirements, and if we  
dither it will be an addition or subtraction from the center value. With out  
dither it would be 4 times a month on my unit. That will allow a very large  
filter TC.
Bert Kehren
 
 
In a message dated 1/30/2012 1:40:57 P.M. Eastern Standard Time,  
albertson.chris at gmail.com writes:

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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