Polk is using the P25 system on their NEW frequencies (less 15mhz). Original system is chugging away on the original channels for now.
Have you heard voice activity on the P25 system? I pass through every couple of days and have yet to hear any voice activity - I last passed through Tues. night/early Wed. morning. My 396T is set as a MOT P25 system, and it recognized the control channel (853.850) and set up the band plan on it's own, but I've yet to hear any voice activity.