[time-nuts] Wenzel Oscillator Repair

Ed Palmer ed_palmer at sasktel.net
Tue Jan 20 08:58:59 EST 2009


Now I understand!  I was planning to reuse the case.  It didn't occur to 
me to sacrifice the case and put the oscillator in another box.

Thanks for the idea, John.

Ed

> Message: 3
> Date: Mon, 19 Jan 2009 21:20:54 -0800
> From: "John Miles" <jmiles at pop.net>
> Subject: Re: [time-nuts] Wenzel Oscillator Repair
> To: "Discussion of precise time and frequency measurement"
> 	<time-nuts at febo.com>
> Message-ID: <PKEGJHPHLLBACEOICCBJMECCBCAC.jmiles at pop.net>
> Content-Type: text/plain; charset="us-ascii"
>
> 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: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
>> Behalf Of Ed Palmer
>> Sent: Monday, January 19, 2009 4:07 PM
>> To: time-nuts at febo.com
>> 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" <jmiles at pop.net>
>>> Subject: Re: [time-nuts] Wenzel Oscillator Repair
>>> To: "Discussion of precise time and frequency measurement"
>>> 	<time-nuts at febo.com>
>>> Message-ID: <PKEGJHPHLLBACEOICCBJMEPMBBAC.jmiles at pop.net>
>>> 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
>>>       
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