SoCalBeachScanner
Member
Personally, at least here in SoCal, I would not want to use the 20" coil at the beach with the ATX, for the following reasons:
I have found with using the stock DD coil, items the coil sounds on that are deeper than 16" are denser or larger than a Ring or Coin which is my target size.
After many months scooping deeper than 16" (up to 24" deep) the target is always something like a 3-4 oz. sinker, aluminum can top or bottom, or some other metal object that is larger than my target size of a ring or coin.
And trying to scoop deeper than 16" in the wet sand, the sand tends to cave in faster than you can scoop it out. Before I quit scooping deeper than 16", some of my deep holes were up to 3-feet in diameter from the sand caving in. And when you do finally chase down the item in that 3-foot wide hole, it's trash or a heavy sinker.
I believe if you heard a faint whisper using the 20" coil on the ATX, you will get very frustrated scooping for a beer can that is three feet deep.
Anyway, those are my thoughts about using the 20" coil at there beach.
I agree with the quote below that I found about large coils.
"Large coils are very useful for finding coin caches and deeply buried, large relics. Large coils provide a considerable ground coverage. Detecting with a large coil enables a detectorist to cover a vast territory, such as a large farm field, more quicker than with a medium search coil. The large search coil's drawbacks are its lack of sensitivity to small targets, poor pinpointing, simultaneous rejection and masking of more targets, and its weight.
The "rule of thumb" governing larger search coil use is as follows: "as the size and depth of the target you seek increases, and the concentration of junk targets in the search area decreases, the size of your search coil should increase."
I have found with using the stock DD coil, items the coil sounds on that are deeper than 16" are denser or larger than a Ring or Coin which is my target size.
After many months scooping deeper than 16" (up to 24" deep) the target is always something like a 3-4 oz. sinker, aluminum can top or bottom, or some other metal object that is larger than my target size of a ring or coin.
And trying to scoop deeper than 16" in the wet sand, the sand tends to cave in faster than you can scoop it out. Before I quit scooping deeper than 16", some of my deep holes were up to 3-feet in diameter from the sand caving in. And when you do finally chase down the item in that 3-foot wide hole, it's trash or a heavy sinker.
I believe if you heard a faint whisper using the 20" coil on the ATX, you will get very frustrated scooping for a beer can that is three feet deep.
Anyway, those are my thoughts about using the 20" coil at there beach.
I agree with the quote below that I found about large coils.
"Large coils are very useful for finding coin caches and deeply buried, large relics. Large coils provide a considerable ground coverage. Detecting with a large coil enables a detectorist to cover a vast territory, such as a large farm field, more quicker than with a medium search coil. The large search coil's drawbacks are its lack of sensitivity to small targets, poor pinpointing, simultaneous rejection and masking of more targets, and its weight.
The "rule of thumb" governing larger search coil use is as follows: "as the size and depth of the target you seek increases, and the concentration of junk targets in the search area decreases, the size of your search coil should increase."