RHIC third generation PLL tune system

During the RHIC 2000 run a prototype PLL tune measurement system was implemented using commercial off-the-shelf hardware. To meet the requirements for tune feedback during RHIC 2001/2002, this system was migrated into RHIC BPM modules, whose flexible DSP/FPGA architecture permitted the specialized processing needed for tune tracking and feedback during acceleration, and whose existing firewire interface provided communication with the Control System. For RHIC 2003 this system has migrated yet again, to state-of-the-art DSPs in VME. We report here on various improvements, extending from the pickup through the analog electronics and digital processing into the Controls interface, and on the performance gains that resulted from these improvements.