I used a fiberglass-reinforced cutoff wheel. This can open practically anything, but it puts a lot of vibration and dust into the innards of whatever you're taking apart. My guess was that this was safer than using a torch.
Since I wasn't going to be able to maintain the original hermeticity, I remounted the oscillator in a Hammond box, like so: http://www.thegleam.com/ke5fx/w1.jpg I brought the trimmer (which was also damaged in this particular oscillator) and oven-status LED out to the box lid, along with the four original terminals. Makes a nice package that can be easily opened for maintenance: http://www.thegleam.com/ke5fx/w2.jpg The repackaged OCXO seems to work fine. I haven't made any hardcore measurements with it but I can tell just by watching the counter that its short-term stability is similar to my other unmolested 5 MHz ULN. -- john, KE5FX > -----Original Message----- > From: [email protected] [mailto:[email protected]]on > Behalf Of Ed Palmer > Sent: Monday, January 19, 2009 4:07 PM > To: [email protected] > Subject: Re: [time-nuts] Wenzel Oscillator Repair > > > I hadn't thought of using a Dremel. Did you use an abrasive wheel or a > steel cutter? The case on mine looks to be about 20 ga. tin-plated > steel (~0.04" thick). The gap is so small it might have been a friction > fit to start with. > > Ed > > From: "John Miles" <[email protected]> > > Subject: Re: [time-nuts] Wenzel Oscillator Repair > > To: "Discussion of precise time and frequency measurement" > > <[email protected]> > > Message-ID: <[email protected]> > > Content-Type: text/plain; charset="us-ascii" > > > > 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 > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
