Calibration of the ATLAS New Small Wheel Front End Electronics in 2022

For the Large Hadron Collider's (LHC) third period of data taking, known as Run 3, the LHC ATLAS detector replaced its two inner end-cap muon subsystems with the New Small Wheels (NSW) that employ novel detector technologies. Leading to the start of Run 3 in July 2022, significant work in data acquisition (DAQ) of the NSW needed to be accomplished. This presentation focuses on a radiation-hard data transceiver ASIC, the GBTx, that is responsible for bidirectional data transmission of the thousands of readout channels of the NSW. It discusses the calibration developed to validate the GBTx clock phases used for data taking in both the NSW Micromegas and Small Thin Gap Chamber technologies and its results. It is imperative that the phase used by the GBTx is well-set for uncorrupt data transmission. Operational experiences at the beginning of Run 3 will also be discussed.