[time-nuts] Tbolt temperature sensor

SAIDJACK at aol.com SAIDJACK at aol.com
Thu Feb 5 08:59:08 UTC 2009


Hi Tom,
 
yes, they are all GPS locked.
 
here is the same OCXO type without proper temp compensation:
 
_http://www.jackson-labs.com/images/gpsstat.htm_ 
(http://www.jackson-labs.com/images/gpsstat.htm) 
 
You can see that now the phase has to change considerably to compensate for  
the EFC voltage change (because tempco has not been properly established  yet).
 
To have the TIC compensate, it needs to detect a phase offset first. This  
error will be prevented if the tempco already compensates properly for  
temperature changes.
 
As the proper tempco is established, the phase offsets diminish in  magnitude.
 
bye,
Said
 
 
In a message dated 2/4/2009 21:58:18 Pacific Standard Time,  
tvb at LeapSecond.com writes:

In that case, how do you distinguish in the plots between
the GPS phase locking reaction to the OCXO starting to
go off-frequency and software temperature compensation?
 
How much of the correction in the plots is due to normal
phase locking against GPS and how much is due to your
temperature sensing and compensation?
 




More information about the time-nuts mailing list