[time-nuts] Re: Why do have OCXO a Vref output?

[Brooke Clarke]

Hi:

I'd second this.  When I was working at HP on the Kobe Instrument Division products (component testers) the 4352S VCO 
tester had a very special power supply for the tuning voltage that was extremely clean so as not to detract from the VCO 
under test.

-- 
Have Fun,

Brooke Clarke, N6GCE
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> 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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