[time-nuts] Re: Why do have OCXO a Vref output? (was: help reviving Trimble UCCM-LPS GPSDO)

[Andy Talbot]

I've always assumed this is because they need to know the reference is
clean and under the OCXO manufacturer's control if it's to meet specs.  If
the user had to supply the reference there's no knowing how clean it is.

Andy
www.g4jnt.com



On Thu, 23 Dec 2021 at 17:47, Attila Kinali <attila at kinali.ch> wrote:

> On Thu, 23 Dec 2021 14:42:27 +0100
> Wilko Bulte <wilko.bulte at xs4all.nl> wrote:
>
> > A quick experiment learned that the OCXO freq responds to the EFC
> voltage.
> > So, looks like the Vref circuit in the OCXO has died.
>
> A stupid side question: Why do have OCXO a Vref output in the
> first place?
>
> I can see that some form of reference might make stabilizing
> the power in the crystal easier, but that still wouldn't make
> it necessary to have an actual reference output.
>
> And related to that: Would supplying the voltage reference
> externally, in case of a broken Vref output, work for whatever
> is inside that needs this reference voltage?
>
>                         Attila Kinali
>
> --
> The driving force behind research is the question: "Why?"
> There are things we don't understand and things we always
> wonder about. And that's why we do research.
>                 -- Kobayashi Makoto
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