I purchased this product new in 2011. Worked basically flawless in Denver. Moved to Albuquerque 3 years ago. Finally took the time to reprogram the 500 for Albuquerque metro area. I Used ARC500 software. The CPU firmware when new was and is currently 2.1. Same with the DSP, version 1.4. However, I am not able to pick up any of the TGRP's in Albuquerque for police; only fire. Also, while listening on this radio on a few other groups, dispatch conversations are clear and crisp, but the cars who communicate with the dispatcher, are garbled and unintelligible. I'm starting to believe that there is a possibility that this radio doesn't support ProVoice systems and other decoding software that will enable me to listen to these specific groups. Any help would be much appreciated.
As already noted, your PSR-500 cannot handle ProVoice transmissions. The only scanners that can are specific Uniden models with the paid ProVoice upgrade: BCD325P2, BCD996P2, BCD436HP, BCD536HP, SDS100, and SDS200.
The SDS100 (with the ProVoice upgrade) will handle the current system. However, see this thread in the New Mexico forum.
From the Bernalillo County Fire Department Facebook page: Today, BCFD is one of many agencies working with R.T.C Inc., a leading Motorola Solutions Channel Partner, on some of the final steps before implementing a completely new Radio Communications System for all of the Emergency Responding...
forums.radioreference.com
It appears that the ProVoice system's days are numbered, with a switchover to a P25 system. If that is the case, and the new system likely will include one or more simulcast sites, then the SDS series would be a good choice. You might monitor that thread to confirm what timeline is expected for a change. The 'new ssytem' will be P25, and most likely P25 Phase II, which your PSR500 cannot decode.
Because a probable change is in the works, even if you purchased an SDS100, I would hold off on buying the ProVoice upgrade. Instead, you might look into using one of the SDR dongles, and your PC, to monitor the ProVoice system until the switch is made.