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Hi Steve - I provided some information on coils in another post a couple days ago. I've copied and pasted it below. It's a little more info then what you asked for, but it includes the coils that I use.
Hope it helps.
The Pro coil that comes with the E-Trac is a very good all around coil. I purchased a 12X10 SEF coil for a little more ground coverage and use it as my everyday coil for non trashy areas. The 12X10 gives you a little extra depth (maybe 1 to 2 inches depending on your ground conditions) as compared to the stock Pro coil. I've found dimes at 10 inches with the 12X10 coil. I use the 15X12 SEF mostly at the beach to cover as much ground as possible. The 15X12 coil also works well in areas that contain VERY little trash and low ground mineralization. It's a big coil and the target separation is an issue if to much trash is present and if your ground is highly mineralized, you may have to back off sensitivity to a point where it hurts your depth. For trashy areas, I use the 6" DD EXcelerator EQ 2 Pro coil. It does an excellent job separating the good targets from trash and goes pretty deep for such a small coil. Found dimes up to 6 - 7 inches with it. If you want a mid size coil, the 8X6 SEF is an excellent coil that is used by many of the experts on the forum. There are a number of manufactures (Detech, SunRay, Coiltek) that make excellent aftermarket coils for the E-Trac and you'll get various opinions on which is the best. I'll suggest some below for your reference. I am not recommending one coil over the other and it's up to you to decide what fits your needs based on where you hunt and what your conditions are. By no means is this a complete list. One thing I can say, is everyone of the coils noted below are used by members of the forum, perform well in the field, and are quality products.
Small Coil (Used for Trashy Areas and/or Tight Confined Areas) = SunRay X5, 4.5 x 7" DD EXcelerator, 6" DD EXcelerator EQ 2 Pro
Mid Size Coil (Good in Trashy Areas and Could Be Used For Everyday Detecting) = EXcelerator 8x6" SEF (Butterfly), SunRay X8,Coiltek 5x10 Joey
Larger Mid Size Coils (Everyday Use) = Stock Pro 11" FBS DD Coil, SunRay X12, EXcelerator 12x10" SEF (Butterfly), Detech 13" Ultimate DD
Larger Coils (Beach, Field, Areas Without Trash) = Coiltek 15" DD WOT, EXcelerator 15x12" SEF (Butterfly) Coil
Question: The standard coil that came with my Etrac has a narrow long pattern. The smaller coils have a smaller cone shaped pattern. It would seem to me the narrow pattern would have better target separation than the cone pattern since the size of the field would be narrower. Where am I wrong in my thinking?
Question: The standard coil that came with my Etrac has a narrow long pattern. The smaller coils have a smaller cone shaped pattern. It would seem to me the narrow pattern would have better target separation than the cone pattern since the size of the field would be narrower. Where am I wrong in my thinking?
You you are wrong, because usually FBS small coils are DD like original Pro coil, but from my test small coils are not better then original Pro, and I think this is because in factory electronic designers from The early FBS explorer did it to work best for 10-11 inches size. have and had allot small coils and never found it to be better, except when you need small to reach something in the bush or in tide corners.
I can tell you that in very heavy trash the Sunray X-5 has worked better than the pro coil. With the pro coil the signals are just overwhelming but with the X-5 I can pick out the good stuff in my ground.
