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

[Rob van der Valk]

Hi Paul,

Maybe I am missing something, but on your read-out I actually see that the 3rd measurement point is in reality the second OT. My first response would be: 1,3,4,5,6,7,8 together show a regular square wave like behaviour, with a fair amount non 50% dutycycle.

The worrisome thing is the close in element, which is and close to main mode and significant. Perhaps caused by a spurious mode (those are always above the main modes), but is all looks kind a fishy: the mixing of two modes normally does not happen, pullng does.

My secondary conclusion would be that maybe there is a lot of FM going on, from some source. Can you shoot detailed spectra around each mode?

Best regards,
Rob

________________________________
From: Walt via time-nuts <time-nuts at lists.febo.com>
Sent: Sunday, April 6, 2025 11:24 PM
To: 'paul swed' <paulswedb at gmail.com>; 'Discussion of precise time and frequency measurement' <time-nuts at lists.febo.com>
Cc: Walt <walt at drizzle.com>
Subject: [time-nuts] Re: Custom Wenzel OXCO with unusual output

No, that didn’t change anything.



And speaking of termination, the output level I cited below (4.4 Vpp) was without a 50 ohm load.



The actual output level into 50 ohms is 2.8 Vpp.



From: paul swed <paulswedb at gmail.com>
Sent: Sunday, April 6, 2025 11:36 AM
To: Discussion of precise time and frequency measurement <time-nuts at lists.febo.com>
Cc: Walt <walt at drizzle.com>
Subject: Re: [time-nuts] Custom Wenzel OXCO with unusual output



Walt, try terminating it in 50 ohms. See if that helps.

Paul

WB8TSL



On Sun, Apr 6, 2025 at 12:32 PM Walt via time-nuts <time-nuts at lists.febo.com <mailto:time-nuts at lists.febo.com> > 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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