Answer
On the base SiP module (453-00012) Vref is connected to pin 65 (VDD_3V3) On the chip antenna or U.FL modules (453-00013 or 453-00014) it is connected to pin 37 (VDD_MCU).
On the base SiP module (453-00012) Vref is connected to pin 65 (VDD_3V3) On the chip antenna or U.FL modules (453-00013 or 453-00014) it is connected to pin 37 (VDD_MCU).