[time-nuts] Is this ocxo salvageable?

Alexander Pummer alexpcs at ieee.org
Wed Apr 9 09:35:09 EDT 2014


get beryllium-coper shimming, 0,08mm or thinner--it does not get "wet" 
from the fluid solder  and it is very hard, but bendable --and push it 
slowly, but with forcefully into the thin gap between the soldered 
parts  to be  separated, while you are heating the case from outside to 
keep the solder melted it is safe and does not need to overheat or pry 
anything, you will need multiple peace for every site of the box
73
KJ6UHN
Alex
On 4/9/2014 6:04 AM, paul swed wrote:
> Totally agree with the comments here. Lot of heat and I slip an exact o
> knife in to gently separate the can and base and also to gently lift the
> base out.
> Remember solder follows the heat so if you can tip the can apply the heat
> below and the solder will tend to drip out.
> The great news is since the oscillator is bad nothing to loose by trying to
> get in.
> Regards
> Paul.
> WB8TSL
>
>
> On Wed, Apr 9, 2014 at 8:01 AM, J. L. Trantham <jltran at att.net> wrote:
>
>> Two other suggestions to open the can.
>>
>> If you don't have a good 'suction' de-soldering station, you can try to
>> 'wedge' some de-soldering braid in the seam to absorb the solder then
>> proceed as Tom suggests.
>>
>> Also, if there is a way to 'grab' the can or the base, such as placing it
>> in
>> a vise, you can use a propane torch to heat the seam rapidly while pulling
>> on the other end with a large pair of pliers.  That's how I have opened HV
>> power supplies on 5061 CS Beam Standards.  They are not SMT but have a
>> layer
>> of thick paper wrapped around the assembly between the can and the assembly
>> and were unharmed in the process.
>>
>> Good luck.
>>
>> Joe
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Tom Miller
>> Sent: Wednesday, April 09, 2014 2:33 AM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Is this ocxo salvageable?
>>
>> I would agree with David. Or there is a SMT resistor or cap that is broken.
>>
>> As to opening the can, do you have a vacuum desoldering station? I usually
>> use a good iron the heat the seam and at the same time suck out as much
>> solder as possible. Then use a small flat blade screwdriver to pry apart
>> the
>> seam. You just want the seam to fail as you work it all the way around. The
>> main point is to get as much of the solder out as possible.
>>
>> Take some pictures so we can see how it goes.
>>
>> Good luck,
>> Tom
>>
>> ----- Original Message -----
>> From: "David McQuate" <mcquate at sonic.net>
>> To: <time-nuts at febo.com>
>> Sent: Wednesday, April 09, 2014 2:58 AM
>> Subject: Re: [time-nuts] Is this ocxo salvageable?
>>
>>
>>> The output looks differentiated, as would happen if the wire connecting
>>> the internal circuit to the output pin became open, leaving only a very
>>> small capacitance to couple the square wave out.
>>>
>>> Dave
>>>
>>> On 4/8/2014 11:46 PM, Chris Albertson wrote:
>>>> My Bliley square wave 10MHz OCXO was working just fine for close to 30
>>>> hours until a few hours ago.  Now it puts out a rather noisy waveform
>>>> about
>>>> one volt peak to peak.
>>>>
>>>> Two questions:
>>>> (1) Are these things repairable, the metal can is soldered.
>>>>
>>>> (2) As you can see in the attached oscilloscope photo the OCXO still
>> puts
>>>> out a strong 10MHZ component.  What is the best way to filter this and
>>>> recover a good 10MHZ square wave?
>>>>
>>>> In the linked photo, both channels are set to 1 volt per division.  The
>>>> large sine wave is from a Trimble Thunderbolt and the smaller wave is
>>>> from
>>>> the failed ocxo  The EFC is left open (disconnected) and a you can see
>>>> the
>>>> frequency is spot on 10MHz.
>>>>
>>>> https://www.dropbox.com/s/0gy3yobd4myi4vp/waveform.jpg
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