[time-nuts] Opening an Isotemp OCXO

J. L. Trantham jltran at att.net
Tue Oct 18 10:57:07 EDT 2016


I'm not familiar with your OCXO but I found one shown on 'theBay' (item  261920574725) and it appeared to have an option for 'mounting screws', four of them, on the bottom.  Interestingly, the 'link' to the datasheet for that unit did not show threads for mounting screws.

If your unit has that option, I would suggest placing four long screws, mounting the item in a vise, use a small torch (I've used a hand held propane torch turned down very low to open a number of units from 5061A's) around the bottom of the case while gripping the top with an appropriate sized Channel Lock plier and lifting off the top.

If you can repair the OCXO, it should be easy to reassemble the unit with solder.

TheBay unit looks like it has a screw cover (which likely has a rubber gasket) for mechanical adjustment of the frequency.  I'd remove that before applying the torch. :^).

If you get it open, I'd love to see some pictures of the insides.

Good luck and hope this helps.


-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Peter Reilley
Sent: Tuesday, October 18, 2016 8:11 AM
To: time-nuts at febo.com
Subject: [time-nuts] Opening an Isotemp OCXO

I bought an Isotemp OCXO82-59 with a frequency of 10 MHz for a $3 at the MIT flea market.
As expected it was dead.   It heats up as expected but looking at the 
output with a scope there
is nothing.   However looking at the output with a spectrum analyzer I 
can see a faint 10 MHz
signal.   It seems that the oscillator is running but the output 
circuitry is dead.   Reasonable

Anyway, has anyone had any luck unsoldering the tin case without destroying it?


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