[time-nuts] Re: Custom Wenzel OCXO - frequency differs from label

[rbenward at verizon.net]

Matt,
Try a hot air gun to heat the screws.  If there is Loctite or other crud, this might help loosen it.

Bob 

-----Original Message-----
From: Matt Huszagh via time-nuts <time-nuts at lists.febo.com> 
Sent: Friday, March 28, 2025 6:12 PM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: Matt Huszagh <huszaghmatt at gmail.com>
Subject: [time-nuts] Re: Custom Wenzel OCXO - frequency differs from label
Importance: High

Thanks for the responses. To address to a few questions/thoughts:

The output is a nice clean sine wave at 10 MHz.

I tried opening the unit, but though I'm able to remove the screws, the lid isn't coming off. I think the lids may have been glued shut and I didn't try too hard to pry them off for fear of damaging the unit.

It's true I don't know that it's an OCXO. It could be some other sort of unit as several people have suggested.

Matt

On Thu, Mar 27, 2025 at 5:55 PM Bob Camp via time-nuts < time-nuts at lists.febo.com> wrote:

> Hi
>
> You might pop it open (it looks like somebody already has done that 
> once) and see what’s inside.
> There have been cases of folks selling OCXO’s that have been “helped out”
> by re-doing the internals.
> Who knows what you might find in there …. Could be a $4 Chinese OCXO.
>
> Bob
>
> > On Mar 26, 2025, at 9:46 PM, Matt Huszagh via time-nuts <
> time-nuts at lists.febo.com> wrote:
> >
> > Hi,
> >
> > I picked up a custom Wenzel OCXO 2nd hand (image attached). The 
> > label indicates 100 MHz, but the J2 port actually produces 10 MHz at 
> > +5 dBm, which surprised me. Does that surprise anyone else? I 
> > realize that it's hard to know what you're going to get with a 
> > custom unit, but I would
> have
> > expected the signal to match the labelled frequency. This made me 
> > worry that the voltage label might also be wrong, but the current 
> > draw seems pretty normal (400 mA at startup, down to less than 150 at temp).
> >
> > One thing that's worth noting is that I'm not getting any output 
> > from J1, and it could be an input for all I know (e.g., for EFC).
> >
> > In case anyone is wondering, I measured the phase noise and it's 
> > nothing
> to
> > write home about.
> >
> > 1 Hz: -107 dBc
> > 10 Hz: -120 dBc
> > 100 Hz: -152 dBc
> > 1 kHz: -159 dBc (which is the floor)
> >
> > Thanks,
> > Matt
> > <wenzel.jpg>_______________________________________________
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