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joey coil question

A

Anonymous

Guest
Hey guys need some help on this one. Today my wife came over after finding a good hitand asked me to check it out. I am using the 5x10 joey coil on my explorer 2. I ran both the iron mask program -4 sens-24 and the disc program i have set up for me. Both programs i could not pick up a good signal. I would have passed it by. She dug the 6 inch plug and found a 1876 seated liberty dime. Why did my joey not pick it up ?? I have already dug wheaties deeper then this w/the joey . At home i laid the coin on the grass and it sounded right for a silver dime . Thanks for your help DVMY p.s she told me totell you guys she still likes her dfx lol.
 
If you take a piece of iron and put it next to a dime then sweep the coil over the dime you will notice that the dime reading is skewed to the left towards more ferrous. It depends on the size of a silver coin and the iron as to how far to the left the reading is skewed. <span style="background-color:#ffff00;">Iron ferrites will skew the reading to the left like a piece of iron next to a silver dime. If the mask is set to -4 then the skew due to ferrites is past that ferrous content level. </span>An iron mask is just a pattern with all levels of conductivity rejected at a specific <STRONG>ferrous content</STRONG> of targets. I don't think I have seen any silver coin skew any further than about -10 although jewelry will do so. A mask between -10 and -14 will catch these coins and most jewelry.
Once you removed the dime from the soil containing the refined iron or magnetic ferrites in the soil then it was not skewed towards more ferrous so you got a good normal reading. You most likely did not notice but in the digital screen you would have seen the null digital reading for ferrous and conductivity. Depending on how magnetic the soil is this problem can also give a one way hit in that the coin will skew from a good reading to the rejected iron mask area if the iron ferrites or refined iron is on concentrated one side of the coin. This causes a jumping crosshairs that depends on the direction of sweep of the coil. One way to get around all that is to run an Iron Mask of about -14 or to duplicate an iron mask in the Smartfind screen.
If she was using a DFX then her VDI numbers were set to accept both the silver and negative VDI numbers that would be the same as the skewed reading or VDI in the +80 or higher and negative VDI in the 0 to -40 range. The DFX and Explorer are about the same in this area. The bottom line is how the two detectors were set. I use both and have gone into this with both of them so I don't miss those kinds of targets.
Hope this helps to restore you faith in the Explorer and coil if it faded some.
HH, Cody
 
My guess is halo effect. Copper erodes faster than silver so it produces a bigger and stronger halo effect than does silver. i.e., easier to find.
Large coils go deeper.
The solution would be the same as all the others that let you go deeper and find more. including be sure you are exactly on top of it.
 
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