All the old schools where I hunt have used coal as a primary heating source in the past. It seems as though they dumped and spread out the cinders in many locations on the school property. Some in one area and others were spread out everywhere. My Tejon doesn't like this kind of enviroment. It chirps and blips all the time. I can turn it down to 0 and get away from some of the noise, but I guess by doing so I've lost a lot of depth. Anyone every had a problem like this?