I have seen differences between both UCT and Oscilloquartz 8663 ocxo’s. The
attached plot shows an example. Both boxes use Ublox LEA-6T receiver, surveyed
in, AD5680 DAC 18 bit DAC, same level shift circuit and same control circuit.
The reference is an LPRO-101. The Oscilloquartz ocxo was purchased used. Both
UCT ocxo’s (only the better one is shown) were purchased new and have 100’s of
operating hours. I have also seen differences with constant EFC control
voltage. The differences limit what performance you can achieve.
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