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Ok I have a let"s say 10 "coil concentric ...and a 10" dd coil...Now I now the concentric does a cone...and the dd does a blade....which one would go deeper...seems to me the concentric?...does the dd blade, go as deep as the cone?..If the blade goes deeper or the same ..what is the use in having a concentric?????????????
I've read that the concentric of the same over all size as a DD will be deeper. I have not done enough coil to coil testing with common targets using the same detector to fully prove it to myself. Even if the concentric is a little deeper at center, the DD may very well sweep more total ground volume on each sweep of the coil.
I generally like concentric coils. The concentrics on the Tesoro's discriminate a little more cleanly than the DD's. Knowing a little about general shape of the field, there are times I've been in trash with a concentric and just raised the coil a little to get better target separation. I can't really do the same with the DD, I have to walk around the target to get different sweep angles to help separate with the DD. Sometimes I walk around the target with a concentric too, just to see if there is some masking going on when things sound kind of clicky or rough on the edges of the tone or it beeps one way and not the other.
I do have to say, that for tot lots and sport fields, the 3.6 x 18 inch clean sweep works very well on the Tejon and that's a DD I'm keeping.
tvr
The concentrics size for size are supposedly a bit deeper in mild soil, but in theory, the DDs will get better depth in heavy mineralization. The concentrics generally discriminate better. How much this effects most of our detecting in the practical sense however may be somewhat debatable. I use both and have had good results with each type. I've found the DDs to separate in trash a bit better than comparable size concentrics and to cover more ground in the long dimension. My two bits.
BB
I prefer the concentric coils over the dd coils on my silver umax. I get better depth and they seem to discriminate better than the dd coils. I'm sure the dd coils have their place where they perform better than a concentric coil, but not in my hunting conditions...........roger
