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

[Luca]

Hi, probably some screws are hidden under the labels

Il Mar 15 Apr 2025, 02:06 rbenward--- via time-nuts <
time-nuts at lists.febo.com> ha scritto:

> 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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