AlanW was curious about the changes happening at ENDX Pcal in the last ten days. All these changes are consistent with the work I am doing at ENDX pcal to gather data for high freqeuncy calibration. Attached is a screenshot of changes in excitation and the corresponding chnages in the TxPD signal. RxPD may show more erratic changes but that is because the RxPD is clipping. We will make sure the Pcal goes back to its original configuration once the data gathering is completed.