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 <att...@kinali.ch> wrote:
On Thu, 23 Dec 2021 14:42:27 +0100
Wilko Bulte <wilko.bu...@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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