Re: How can I tell if i have an oxco or a txco?

This must be OCXO. Crystal unit has temperature label 82.8°C. On opposite side of PCB there is strange chip which can be temperature sensor. But I can not see on your pictures what is heating element.

I believe that part is a heating resistor

"The part you requested is part of a system that is unique and requires special testing and fixtures as a system. The 10MHz oscillator goes under special aging and temperature testing and "learns" how it interacts with the system (StarLite). We then insert a proprietary algorithm to improve performance and allow the unit to meet specification. We do not provide replacement parts for the requested item. The Starlite is only sold as an end item."


This is the response I got when I asked for replacement parts. The only problem with this answer is that I have swapped oscillator between two units and they operate with no problems. Is this guy pissing on my leg and telling me its raining?

They are telling you the truth. They use firmware to improve the performance of a low cost oscillator.

Sir,
You have a OCXO in front of you. And as much as they told you they do not sell replacements they are correct as they are tested, burned in and aged to insure that over time they hold thier spec which you would not see by swaping them out and running for a short time.
Now did you ever figure out the pinout? I ask as I have a box of them sitting right here in front of me. The only known differance is the part number but I think it is a revision number only. All the ones I have are marked DATUM 06 (1st Line) 023034-005 (2nd line), 10.000mhZ (3rd line), & S/N 0156 (4th line), & 0424 (last line)
Now I know that DATUM is NOT the mnf as they were mnf'd for them, Also the S/N I gave is for just one unit as all have a different S/N on them.
So the info I got was that these are very stable OCXO's used in thier gps freq units as you know cause your messing with it. So if the Vcc line is shorted then it is most likely either the heating element or the IC that inside if that is what it is, a 7404 is a chip that is sometimes used as part of a crystal oscillator circuit and there are caps to start it into oscillation and maybe a trimmer for fine tuning it. But they do draw some heavy start up current compared to operating current and maybe it is supposed to read that low.
If you are still interested I can take readings for you from whatever pin you want to what ever referance point. Just say what & where.
BAGGS1