Being an array operator requires the ability to pay attention to multiple computer screens that monitor the health of the antennas, answering radio calls from technicians in the field, working with observers and scientists whose tests or observations are running, and answering questions from tour groups that may be passing through. Jim and Greg are sharing duties here, but often only one operator is on duty. S/he must know how to troubleshoot when problems arise and who to call if the problem can't be fixed by the operator.