I'm in the East Valley. But I'm scanning ALL SITES and ALL Control Freqs. I'm getting fairly strong signals from most of them. I even get the "CON+" tag on my display while listening. But no one ever talks. At least not yet.
I also have APS programmed into my scanner and I AM hearing activity on that system, a P25.
I don't understand your comment about Check all listed channels, how do I check them if they are NOT in the DB? Is there another DB somewhere?