[time-nuts] Wenzel Oscillator Repair

John Miles jmiles at pop.net
Mon Jan 19 17:20:26 EST 2009

I had a similar problem with a 5 MHz OCXO from their ULN series.  There was
a bad solder joint on the output connection, easy enough to fix once I got
the unit open.

In my case I used a Dremel tool to cut the seam.  Suggest wearing a dust
mask, obviously, and keep your cuts close to the perimeter of the can, in
case the PC board comes right up to the edge like mine did.

-- john, KE5FX

> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> Behalf Of Ed Palmer
> Sent: Monday, January 19, 2009 2:05 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] Wenzel Oscillator Repair
> Hello,
> I have a piece of equipment with a Wenzel 5 MHz oscillator from the
> Timekeeper <http://www.wenzel.com/pdffiles1/Oscillators/TMK.pdf> line.
> It's functioning (that is, it's on frequency), but the output level is
> 20 - 30 db lower than it should be.  The level seems to change every
> time I turn it on.  By the way, this unit does NOT have an option to
> disable the output.  I saw that was listed in one of the Timekeeper
> documents that I found.
> It seems a shame to junk it when the repair is probably easy.  The
> challenge is how to get into the thing in the first place.  Does anyone
> have any hints & tips on how to open or repair one of these soldered-can
> oscillators?  I found a page
> <http://www.realhamradio.com/GPS-oven-journey.htm> that described
> opening an HP 10811 from a Z3801A, but more ideas are always welcome.
> Thanks,
> Ed
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