back in 2016 when I was collecting stuff for a GPSDO (in the end this project never started, but I'm still thinking about it from time to time) I bought the oscillator that can be seen at the 20 minute mark on ebay for cheap.
Do some of you have documentation about this oscillator ? I wasn't able to find any datasheet, I think I managed to find Vcc and GND and the output pin, but I didn't find what the 4th pin is. It seems to be not connected to anything but I can't be sure and I don't want to open the can. I thought it could be VCO control pin but I wasn't sure about how to check that without risking damaging anything. And there is a screw for adjustment showing through a hole in the can, is it possible to have at the same time a mechanical adjust screw AND a VCO control pin?
Unfortunately I don't have the PCB anymore, only the blurry picture (not mine, from ebay listing) attached.
The fact that I don't have the datasheet nor the full pinout is a serious limitation to using it for anything too serious, but what do you think I could still use this XO for ?