Just what is considered falsing?

[joecatch]

I have had my AT Pro for 2 months now and have about 35 hours on it and have found alot of clad (but no silver or gold). It has a 511 serail number. I see alot of talk about false signals but am I not sure what a false signal is. Sometimes I get a tone when I swing in one direction and not the other. Sometimes I get a few of these in a roll. And then I can move 50 or 100' away and it stops. I assume it is just junk that the AT Pro is trying to figure out what it is. And sometimes I hear a tone when I brush the coil on high glass when I am swinging. Maybe I am not keeping the coil level. So I am not sure if I have a problem and just living with it or not. Any input?

JC