A clad quarter at 6 or 7 or 8 inches deep is getting a bit deep for atpro even with big 11dd, then you gotta figure in your sense setting. So, its at the point where the conductive properties of the target "appear" weaker to the tecter so it starts to want to drop into the low tones. Also, the tecters digital display is much slower than the audio feedback so you can never tell what the numbers are trying to say, they lag audio, they are not as fast as the audio in your ears. Numbers are not as fast so they tend to bounce around on a good deeper target, and they may tend to stay toward the higher end or the mid tone end, depending on which way the target tips the digital scale, but they can never make up there mind, so rely on the audio. Never look at the numbers, you will miss targets. On my atpro, deeper crusty wheaties (say four or five inches) start breaking down audio wise, they want to go high but then get low, then a bit high then low, it sounds tempting so I dig them because the proportional audio (VOLUME or loudness) indicates that the target is deeper, so I dig it and it always comes up as a deep wheaty or copper cent. Bronze indian cents are even worse, but I dig them too because the audio indicates a deeper target, I know its not iron, audio is iffy mid/high/mid/high it cant decide what it wants, so I dig it and its a really deep indian or crusty wheat. A six or eight inch clad quarter should not sound very loud either. Another thing, deep alum pull tabs, say five inches, start to break down from mid tone to the lower iron tone then back and forth, but favoring mid tone. These are almost always deep pull tabs. I am sure there are guys that have dug deep mid tones with atpro to be rewarded with a nice deep silver dime, or even a large cent. Detectors work on conductivity, not on actual target. A five pound gold nugget will give high pitch if its one inch deep. A five pound hunk of silver will give low iron tone if its two feet deep. Numbers have use, but I prefer to ignore them.
So the quarter had a dime on each side,and it hit in the mid to high range tones,had I looked at the numbers,I would have passed it up! I hunt with my ears,99% of the time,the numbers will lie to ya!
