A
Anonymous
Guest
Would like to clarify something___do PI's test the same in air as in ground? or is it they test poorly in air and give better depth results in ground? Thanks....
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A
Anonymous
Guest
Hi Don
For the most part the air test are good with them. Everything taken into consideration, maximum depth would be on a air test.
Just to be a tad bit contrary from the last statement, there appears that at times the salt water enhances the target depth. Never noticed this on land or fresh water, but I think it has happened in the salt a few times. This is very hard to duplicate for testing purposes.
No matter how you look at it, VLF or PI, the ground matrix has to be figured in to the formula as it affects all detector
For the most part the air test are good with them. Everything taken into consideration, maximum depth would be on a air test.
Just to be a tad bit contrary from the last statement, there appears that at times the salt water enhances the target depth. Never noticed this on land or fresh water, but I think it has happened in the salt a few times. This is very hard to duplicate for testing purposes.
No matter how you look at it, VLF or PI, the ground matrix has to be figured in to the formula as it affects all detector
A
Anonymous
Guest
Hi Don,
How in the heck are you? Hope all is well.
Now, to your question, a lot depends upon just where you perform the air test. In some noisy environments, I have been able to get more depth in the ground than in an air test, but this is because of the noise level. In some cases, just raising the coil can increase the noise significantly. If this happens, then it is possible to do what I mentioned and obtain greater in ground depths.
Testing a PI can be frustrating. I have seen extremes at my house that will vary just how well I can detect a simple nickel. The noise levels can change enough that I may only be able to detect the coin about 12" air test at one time, but later, be able to get a weak signal up to 17" or so with the same coil and same detector.
What I have found is I generally do as well or better in the buried in the ground test than I get in my average air test. In other words, I normally don't do as well as my best air test, but better than some of my poor air tests.
If this sounds confusing, sorry, but it is confusing. Air tests are a general reference for me and that is all.
Reg
How in the heck are you? Hope all is well.
Now, to your question, a lot depends upon just where you perform the air test. In some noisy environments, I have been able to get more depth in the ground than in an air test, but this is because of the noise level. In some cases, just raising the coil can increase the noise significantly. If this happens, then it is possible to do what I mentioned and obtain greater in ground depths.
Testing a PI can be frustrating. I have seen extremes at my house that will vary just how well I can detect a simple nickel. The noise levels can change enough that I may only be able to detect the coin about 12" air test at one time, but later, be able to get a weak signal up to 17" or so with the same coil and same detector.
What I have found is I generally do as well or better in the buried in the ground test than I get in my average air test. In other words, I normally don't do as well as my best air test, but better than some of my poor air tests.
If this sounds confusing, sorry, but it is confusing. Air tests are a general reference for me and that is all.
Reg
A
Anonymous
Guest
Hi Reg.
The problem your explaining is a cause of external interference, not that the detector can't air test well. It goes without saying that a clean signal level is needed to start. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="
">
I should have added to my post, "providing one doesn't have outside interference" <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=""> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="">
Mr. Bill
The problem your explaining is a cause of external interference, not that the detector can't air test well. It goes without saying that a clean signal level is needed to start. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="
">I should have added to my post, "providing one doesn't have outside interference" <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="
"> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt="">Mr. Bill
A
Anonymous
Guest
Hi,
I remember Reg saying a while back that under certain circumstances, mineralised ground will accentuate the signal from small gold, and lifting the coil to where mineralisation would normally taper off, still left a good signal that would not be so marked if the mineralisation hadn
I remember Reg saying a while back that under certain circumstances, mineralised ground will accentuate the signal from small gold, and lifting the coil to where mineralisation would normally taper off, still left a good signal that would not be so marked if the mineralisation hadn
A
Anonymous
Guest
Hi Kev,
What I have encountered is magnetite seems to enhance the signal from small gold under certain conditions. So, certain rocks or ground conditions can make the signals from small gold targets stronger.
Also, I have found that the ground signals diminish much faster than most gold signals as the coil is raised above the ground. So, raising the coil can signicantly reduce the ground noise, but not lose as much depth on many to most nuggets. I suspect some of the very small nuggets will be lost.
Now, ground signals are generally much slower responding changes, so sweeping slowly can make a big difference in the ground response. This is true with either a mono or a DD coil. This is why sweeping slowly and using the autotune or a double filter will make a big difference.
Now, I have about given up trying to figure out just why I can see so much difference in signals at times. However, my test bench area is extremely noisy and even moving the coil just a little reduces the noise level significantly.
Because of this, it has been easy for me to see the significant air test depth variations that can occur simply because of noise. What is somewhat odd is the noise levels are not necessarily obvious in the headphones, but can be seen on the scope. In other words, a depth loss may occur without any obvious apparent reason. If one is very careful and notes the subtle audio level changes, then one can hear the noise that will alter the air tests.
I hadn't given much thought to nails altering the depth capabilities but I suspect it is possible. I will have to take time and try some experiments along those lines.
Reg
What I have encountered is magnetite seems to enhance the signal from small gold under certain conditions. So, certain rocks or ground conditions can make the signals from small gold targets stronger.
Also, I have found that the ground signals diminish much faster than most gold signals as the coil is raised above the ground. So, raising the coil can signicantly reduce the ground noise, but not lose as much depth on many to most nuggets. I suspect some of the very small nuggets will be lost.
Now, ground signals are generally much slower responding changes, so sweeping slowly can make a big difference in the ground response. This is true with either a mono or a DD coil. This is why sweeping slowly and using the autotune or a double filter will make a big difference.
Now, I have about given up trying to figure out just why I can see so much difference in signals at times. However, my test bench area is extremely noisy and even moving the coil just a little reduces the noise level significantly.
Because of this, it has been easy for me to see the significant air test depth variations that can occur simply because of noise. What is somewhat odd is the noise levels are not necessarily obvious in the headphones, but can be seen on the scope. In other words, a depth loss may occur without any obvious apparent reason. If one is very careful and notes the subtle audio level changes, then one can hear the noise that will alter the air tests.
I hadn't given much thought to nails altering the depth capabilities but I suspect it is possible. I will have to take time and try some experiments along those lines.
Reg