I have had my Spectra for a while, but have only recently been able to start playing with it. I dug a quarter with it, and could not find any other targets, so started experimenting with the quarter I found. I had watched the DVD from whites, and pushed the trigger forward looking for the hump like was suggested. I noticed when the coil was close to the coin the green line was the highest peak, but when I raised the coil a few inches, the red line became the higher peak. Also the line depicting the target size got quite a bit larger also. Any ideas why this is?