[time-nuts] Isotemp OCXO

[Alberto di Bene]

David Smith wrote:
> 
> I've built a GPSDO using an Isotemp 10MHz OCXO (134-10) as available on 
> eB*y a while back.
> 
> The OCXO seems to be very slow to respond to changes in the control 
> voltage.  I assume there is an internal RC filter or similar to improve 
> performance.  However, the datasheet makes no mention of this.  Does 
> anyone know what the time-constant of the control input might be?
> 

  David,

   I built a few years ago a GPSDO based on the very same Isotemp OCXO you are using, but didn't notice what you 
observe. And after all, the GPSDO itself must have very long time constants on the ECF loop so to make a delay in the 
OCXO response (if it really exists) irrelevant.

73  Alberto  I2PHD