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So when did detecting a 10 inch dime become the " The Gold Standard" ?
Posted by woodchiphustler
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Re: So when did detecting a 10 inch dime become the " The Gold Standard" ? March 23, 2018 03:48PM |
woodchiphustler Wrote:
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> Since I have never found one in my soil was this b
> ased on air testing CZ models only?
It was at one time, widely known that the early Los Banos CZ3D models would air test Dimes at 10+ inches all day.
If NASA Tom tweaked a later First Texas model for someone, it too would hit at 10" on dimes.
This equates to even more depth when actually hunting in the dirt since older targets would be electrically connected in the soil.
That magic "halo" is real. The minerals in the soil and moisture help to make the target appear to the detector as more conductive.
Many people started using this unit of measure as a performance benchmark. Many people have test gardens that have
harder to detect items such as dimes at various depths from 5 to 12".
NASA Tom had some specific parameters for setting up a test garden that actually accurately simulate real world conditions for a target to be
electrically connected to the soil. I can vouch for the effectiveness as I did it many years ago. Both of my 12" clad and silver dimes eventually became viable targets for my CZ3D.
Many people will argue that they never see any coins past 7 or 8 inches. This may be completely accurate for their soil conditions, sink rate for the area, average moisture conditions, time of day with EMI and RFI conditions etc etc however......
not everything is equal and there are instances of where coins will be found at extreme depths, it simply depends on the variables in your area.
Down here in south Florida we have sand and sand has some extreme sink rate.
Yesterday I was hunting in front of the Margaritaville resort on Hollywood beach. I dug an extremely green and slightly crusty clad dime (pictured) from the towel line that was so very well electrically connected, it had turned the soil, in this case (sand) green with oxides.
It was a very weak target signal and I barely picked it up but as I always do, I moved some sand with a swipe or two and put the coil on it. I usually attempt to make note of how deep these faint targets are and found a dime at roughly 13" and I'd give that a plus or minus 1/2 " either way.
I also dug a heavily concreted quarter at around 15" (pictured) that was also on the towel line and also below the dry sand in the compacted wet sand. The surrounding sand was full of oxides leached from the coin.
The two other quarters pictured where also relatively deep somewhere past 10" and where the hard packed moist sand put a halt to their sinking.
Metals and salt sand act like a battery, there's quite a bit of electrolysis going on, the longer its in the ground the better it electrically connects and this helps to detect it at greater depth.
The same holds true for all other soil matrix.
You might not see oxides surrounding a coin but they are there if its been in the ground for a while, this is a byproduct of the coin breaking down but at the same time making that halo effect to electrically connect to the soil.
These deeper targets are an almost everyday occurrence for me while hunting for jewelry on the towel line at any south Florida beach. I usually do not bother to carefully excavate these targets, I simply dig with the scoop while intermittently sweeping the hole for audio.
Sometimes as with yesterday, my curiosity get the best of me and I have to know how deep it is. Its easy to dig in wet compacted sand so I slow down and excavate while paying attention to the depth, orientation etc etc .
I think that a dime at 10" is a perfect test for most detectors as long as the test garden is configured to simulate real world conditions.
I had clad dimes at 5, 7, 10 and a clad at 12 and silver at 12 in my test garden. I no longer own the house so I'll be setting it up again when I move soon.
As far as air testing, it not in any way accurate enough to determine the true depth capabilities of a detector, its hit or miss, ball park analysis but it is fun and entertaining to do.
Up to my ____ in Pulltabs, Grant
-------------------------------------------------------
> Since I have never found one in my soil was this b
> ased on air testing CZ models only?
It was at one time, widely known that the early Los Banos CZ3D models would air test Dimes at 10+ inches all day.
If NASA Tom tweaked a later First Texas model for someone, it too would hit at 10" on dimes.
This equates to even more depth when actually hunting in the dirt since older targets would be electrically connected in the soil.
That magic "halo" is real. The minerals in the soil and moisture help to make the target appear to the detector as more conductive.
Many people started using this unit of measure as a performance benchmark. Many people have test gardens that have
harder to detect items such as dimes at various depths from 5 to 12".
NASA Tom had some specific parameters for setting up a test garden that actually accurately simulate real world conditions for a target to be
electrically connected to the soil. I can vouch for the effectiveness as I did it many years ago. Both of my 12" clad and silver dimes eventually became viable targets for my CZ3D.
Many people will argue that they never see any coins past 7 or 8 inches. This may be completely accurate for their soil conditions, sink rate for the area, average moisture conditions, time of day with EMI and RFI conditions etc etc however......
not everything is equal and there are instances of where coins will be found at extreme depths, it simply depends on the variables in your area.
Down here in south Florida we have sand and sand has some extreme sink rate.
Yesterday I was hunting in front of the Margaritaville resort on Hollywood beach. I dug an extremely green and slightly crusty clad dime (pictured) from the towel line that was so very well electrically connected, it had turned the soil, in this case (sand) green with oxides.
It was a very weak target signal and I barely picked it up but as I always do, I moved some sand with a swipe or two and put the coil on it. I usually attempt to make note of how deep these faint targets are and found a dime at roughly 13" and I'd give that a plus or minus 1/2 " either way.
I also dug a heavily concreted quarter at around 15" (pictured) that was also on the towel line and also below the dry sand in the compacted wet sand. The surrounding sand was full of oxides leached from the coin.
The two other quarters pictured where also relatively deep somewhere past 10" and where the hard packed moist sand put a halt to their sinking.
Metals and salt sand act like a battery, there's quite a bit of electrolysis going on, the longer its in the ground the better it electrically connects and this helps to detect it at greater depth.
The same holds true for all other soil matrix.
You might not see oxides surrounding a coin but they are there if its been in the ground for a while, this is a byproduct of the coin breaking down but at the same time making that halo effect to electrically connect to the soil.
These deeper targets are an almost everyday occurrence for me while hunting for jewelry on the towel line at any south Florida beach. I usually do not bother to carefully excavate these targets, I simply dig with the scoop while intermittently sweeping the hole for audio.
Sometimes as with yesterday, my curiosity get the best of me and I have to know how deep it is. Its easy to dig in wet compacted sand so I slow down and excavate while paying attention to the depth, orientation etc etc .
I think that a dime at 10" is a perfect test for most detectors as long as the test garden is configured to simulate real world conditions.
I had clad dimes at 5, 7, 10 and a clad at 12 and silver at 12 in my test garden. I no longer own the house so I'll be setting it up again when I move soon.
As far as air testing, it not in any way accurate enough to determine the true depth capabilities of a detector, its hit or miss, ball park analysis but it is fun and entertaining to do.
Up to my ____ in Pulltabs, Grant