[time-nuts] Re: Custom Wenzel OXCO with unusual output

[Jim Lux]

If that is indeed an input, then the module is a "clean up loop" - we use them when you get a signal over a long run (100s of meters) of coax (or fiber) from some reference (a maser?). You want to regenerate it without close in phase noise (or broadband noise).

They essentially have nice quiet oscillator with good close in and ultimate noise floors that is phase locked to the external reference.  They are also available to have different output and input frequencies (e.g. 10 MHz in, 50 or 100 MHz out). 
 


On Sun, 6 Apr 2025 15:31:00 -0700, Walt via time-nuts <time-nuts at lists.febo.com> wrote:

The Wenzel in the picture you sent looks exactly like the one I have!

So what is this, and what is the function of the Ext Ref input, and the Status line?

As an aside, it draws 20 mA at startup and never varies from that, so I don't think it is a OXCO.

-----Original Message-----
From: Azelio Boriani via time-nuts 
Sent: Sunday, April 6, 2025 10:16 AM
To: Discussion of precise time and frequency measurement 
Cc: Azelio Boriani 
Subject: [time-nuts] Re: Custom Wenzel OXCO with unusual output

The other SMA is an external reference input. I have seen one of them on a Miteq satellite upconverter.

On Sun, Apr 6, 2025 at 6:31 PM Walt via time-nuts 
wrote:

> I picked up a custom Wenzel 500-13248B quartz oscillator and upon
> measuring it, I'm not sure if it is working as designed or what.
>
> The RF Out is a raggedy 10MHz sine wave at 4.4Vpp, and a spectrum
> analyzer shows peaks at 10, 20, 30, 40, 50, 60 and 70 MHz. There may
> be more but I'm not sure how to acquire them.
>
> There is nothing coming out of the second unmarked SMA.
>
> Assuming this is not broken, what kind of oscillator is this, and what
> would it be used for?
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