[time-nuts] Is this ocxo salvageable?

Francesco Messineo francesco.messineo at gmail.com
Wed Apr 9 07:34:19 UTC 2014

On Wed, Apr 9, 2014 at 8:58 AM, David McQuate <mcquate at sonic.net> wrote:
> 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.

I agree, I had a similar problem on an oscilloscope input some time
ago. It was a cold solder joint.
It must definitely repairable as long as the shielding can be opened safely.

Frank  IZ8DWF

> 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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