I’ve got a LimeSDR Mini v1.2 that I would like to use at a reference clock frequency of 30.72MHz rather than the 40MHz it defaults to. For various reasons, I’d like to do this by trimming the VCTCXO using the DAC at IC9 on the board. How would I do this?
In LimeSuiteGUI under board controls, I see there is a VCTCXO (runtime) value that defaults to 180 and a VCTCXO (permanent) value that defaults to 65535. How do these two values correspond to the reference clock frequency? I’ve noticed that plugging in different values and clicking “write all” doesn’t change the CGEN Ref Clock frequency in the calibration tab.
Any help with this would be greatly appreciated.