Having a problem with P25 phase 2 reception. My local FD/EMS is Spotsylvania, Va. The control channels are 800 mhz and the tower is appx. 3 miles from my location. Signal strength averages 3-4 bars. On display 1 is shows up as a P10 signal type when I get a signal. P25 threshold is 8. I rarely receive an audible transmission. My local tower for state departments, ie: Forestry, game and fish and DOT come in fine. Their control channels are VHF-Hi. I've got an external antenna on the patio. Display show a P25 signal type. I programmed he scanner using freescan. Any ideas as to what the problem might be?