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depth
- Thread starter kansas
- Start date
Living in Iowa, I mainly hunt in what is considered to be moderately mineralized soil conditions. I hunt for old coins in old sites and would rather spend a day digging a few old coins from the 1800's than a pocketful of clad. But, that is just me.
The frequency and design of the coil has an impact on the depth of the coins I can detect. You will have more success hunting highly mineralized soil with a DD coil than you might with a comparable sized concentric. As to frequency, the lower the frequency, the more sensitive to higher conductive coins (such as silver and copper). And, the higher frequency coils work better for lower conductive targets (such as nickels and gold). As I said, the soil here is moderately mineralized and I find no "stability" advantage using the DD design. I believe the concentrics get me as much, if not more, depth. And, I like the pinpointing and sizing ability of the concentrics better. Again, that is jusy my opinion.
I am confident that I can dig dimes at 8 inches with my 3 kHz or 7.5 kHz concentric coils. Quarters are at least an inch or two deeper. Nickels maybe a bit less (6 -7 inches) with the 3 kHz coil. With the 18.75 kHz concentric coil, I can get more depth on nickels, about the same on quarters, and a bit less on dimes. Kind of tough to compare three coils on three different targets, in the "real world". I get excited and simply start digging when I "discover" an 8-inch quarter. So, I seldom take the time to switch coils and make comparisons. With that said, most of my depth / frequency / design comparisons are based on my 15-year old coin garden. HH Randy
The frequency and design of the coil has an impact on the depth of the coins I can detect. You will have more success hunting highly mineralized soil with a DD coil than you might with a comparable sized concentric. As to frequency, the lower the frequency, the more sensitive to higher conductive coins (such as silver and copper). And, the higher frequency coils work better for lower conductive targets (such as nickels and gold). As I said, the soil here is moderately mineralized and I find no "stability" advantage using the DD design. I believe the concentrics get me as much, if not more, depth. And, I like the pinpointing and sizing ability of the concentrics better. Again, that is jusy my opinion.
I am confident that I can dig dimes at 8 inches with my 3 kHz or 7.5 kHz concentric coils. Quarters are at least an inch or two deeper. Nickels maybe a bit less (6 -7 inches) with the 3 kHz coil. With the 18.75 kHz concentric coil, I can get more depth on nickels, about the same on quarters, and a bit less on dimes. Kind of tough to compare three coils on three different targets, in the "real world". I get excited and simply start digging when I "discover" an 8-inch quarter. So, I seldom take the time to switch coils and make comparisons. With that said, most of my depth / frequency / design comparisons are based on my 15-year old coin garden. HH Randy
Virgile in Okla.
New member
n/t
Bavaria Mike
New member
A Dime might get about 10" deep, a Nickle will bounce around with a questionable signal at most depths and I have not dug a very deep Nickle. I have been using the 8" coil with most finds lately and dug an unbelievable signal just yesterday, it was a metal bucket rim at 18", a painful dig. It is very wet and the ground is saturated at this time. The 10" coil will probably get better depth but those Nickles do play games with the XT70 as it does with deep iron. I am detecting in all metal mode by the way. Just my 2 cents worth, hope to hear what the others think. HH, Mike