Data Sheet Needed - Vectron 224-8037, 100 MHz OCXO

[rubidium]

Anyone have a data sheet for this OCXO? The issue is that the internal 10-turn frequency adjust pot has a glitch right at the 100 MHz "sweet spot."  So in my attempt to calibrate it against a frequency standard I end up with instability at the 100's of mHz to 1 Hz level. I'd like to replace the pot, but the unit is sealed with solder and I hate to embark on that risky adventure. In addition to the SMA RF output port, there's a 7-pin terminal arrat at the base of the unit. I was hoping that the OCXO can accommodate an external frequency control voltage and thereby bypass the corrupted pot. But I can't find a data sheet anywhere to know how those pins are assigned.
Jim

[eblc1388]

Searching for vectron OCXOs led me to the following OCXO pinout diagram of a similar Vectron Model. I would say it has a high possibility of having the same pinout as your existing unit. It shows the respective pin arrangement and function.

First you can measure if there is a DC voltage at pin #7 of the OCXO, if so, you can connect a 10K~20K POT between pin#3 and Pin#7, with the wiper going to pin#6. Hope this helps.

   

[rubidium]

There appears to be a lot of variability with pin assignments on similar looking Vectron OCXOs - at least with these older, now obsolete, units. Mine came in a Wavecrest DTS-2070 time interval system, and is being driven by 24VDC to pin 4, with the ground return to pin 3 which is also connected to the case.  That agrees with your diagram. But I have explored the other pins, and discovered that pins 2 and 7 are also connected to the case. The remaining pins 1, 5, and 6 have no continuity to anything. I was hoping that these other pins would support external electronic frequency control. The problem is that the internal frequency control 10-turn potentiometer smoothly controls the frequency over a +/-500Hz range - except in the +/-1Hz subrange centered right at 100MHz, where there is a bad glitch. Must be a worn spot caused by 20+ years of people making cal adjustments. So frustrating, since this results in poor thermal and mechanical stability when I try and calibrate the thing myself against one of my house standards. The unit has been powered on for a week and is still drifting around. So I was hoping to bypass the internal pot with an external pot, but it appears that's not going to happen.

Since my original post, I found a used 100MHz Vectron OCXO that was quite inexpensive (model 229-9268) for which I do have the pin map (from a 5-year old post on time-nuts), and so I'll try and adapt that once I receive it. If I end up failing at that, I'll just hook up my HP8664A sig gen, set it to 100 MHz and externally drive it with my 10MHz house standard.
Jim