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Originally posted by ivconic
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Each one of us already had many occasions to perform various air and in soil tests so far.
Usually detectors are tested to show "depths" in air or in soil.
Some tests are done better and some are not.
Some tests are done fair and some not.
Usually the "manufacturer" of the detector tends to perform test which will show his "product" in best possible light.
Many of tests are done in fair manner, to show some benefits or drawbacks of chosen model.
Last couple of years we were eyewitness of many good and bad testings, mostly on Youtube.
I can name some video clips that i like most, but i wouldn't, because it is really not the point here.
The point is that majority of people mostly tends to achieve greater depths with their detectors.
Minority of the prospectors (including myself) are not focused that much on depths - but more likely on some other features which are much more important than plain depth.
Recovery speed is the one of the most important feature. So lately we can see many more testings that shows such feature at some models.
Probably the most comprehensive tests were done by Norfolk Wolf, and all were presented on many sites as well as on Youtube too.
Norfolk Wolf indeed done a good job, showing behavior of many models under the very same conditions. In the past i was ready to put some remarks on his testings, but now i understand that he done that in pretty fair manner.
After he did all the testings in front of the camera - many others also appeared to do the same or similar stuff.
Now....
most favorite thing to show was some iron near the coin, or some mineral, hotrock or similar also near the coin. (PAY ATTENTION ON THIS! It is not the same case when hotrock is close to coin or constrained few inches away!)
Few days ago i checked a bit different thing;
i dug a hole 30cm deep. At the bottom i put 2cm bronze coin and than returned all the soil over it. So coin was "burried".
I took several detectors and tried to detect that coin.
Most of the detectors really detected that coin. Some of the machines detected it barely, some other more easier, with louder and clear audio response.
I am proud to say that my latest IGSL detected it as a piece of cake! Also my old SMW2 detected it pretty easy.
I also checked with Musketeer XS and 18cm coil (TS800). Weak detection, coil must be almost pushed to soil... but still detected!
Ok... that test was done. What was achieved with such test? Nothing really!
BUT! Keep reading this!
Next thing i done - i removed first 15cm of soil from a hole. Than i put piece of hotrock in it and again returned the rest of soil back.
Pay attention on this! Hotrock is NOT just near the coin - it is 15cm over the coin and 15cm under the soil level, covered with soil too (buried).
So... i took first of the machines to test. NOTHING! NO DETECTION AT ALL! Second detector... NOTHING! Third detector .. NOTHING.... !
I took 8 various metal detectors and tried.... NOTHING! NO DETECTION AT ALL!
Next 2 days i took 3 more metal detectors from a friends (XP GMP, DFX, Tejon) ... NOTHING!!!!
.....
So.... folks.... what are we talking about here all the time? Depths? Mha,mha,mha!!!!
.....
But wait! There is a hope! Minelab GP3000 DID IT!!!! Nice and clear DETECTION!!! With or without that damn hotrock - same DETECTION!
VLF's are definitely very LIMITED!
I can only wander... God knows how many gold coins i've been skipped so far in last 23 years of me being the prospector!??
And most of those nice gold coins were "deep" barely 5-10cm in soil!
So....
We have to put the finger on our heads and start to think; are we gonna chase more (only) depths... or we gonna finally make some REAL WORKING VLF!?
Usually detectors are tested to show "depths" in air or in soil.
Some tests are done better and some are not.
Some tests are done fair and some not.
Usually the "manufacturer" of the detector tends to perform test which will show his "product" in best possible light.
Many of tests are done in fair manner, to show some benefits or drawbacks of chosen model.
Last couple of years we were eyewitness of many good and bad testings, mostly on Youtube.
I can name some video clips that i like most, but i wouldn't, because it is really not the point here.
The point is that majority of people mostly tends to achieve greater depths with their detectors.
Minority of the prospectors (including myself) are not focused that much on depths - but more likely on some other features which are much more important than plain depth.
Recovery speed is the one of the most important feature. So lately we can see many more testings that shows such feature at some models.
Probably the most comprehensive tests were done by Norfolk Wolf, and all were presented on many sites as well as on Youtube too.
Norfolk Wolf indeed done a good job, showing behavior of many models under the very same conditions. In the past i was ready to put some remarks on his testings, but now i understand that he done that in pretty fair manner.
After he did all the testings in front of the camera - many others also appeared to do the same or similar stuff.
Now....
most favorite thing to show was some iron near the coin, or some mineral, hotrock or similar also near the coin. (PAY ATTENTION ON THIS! It is not the same case when hotrock is close to coin or constrained few inches away!)
Few days ago i checked a bit different thing;
i dug a hole 30cm deep. At the bottom i put 2cm bronze coin and than returned all the soil over it. So coin was "burried".
I took several detectors and tried to detect that coin.
Most of the detectors really detected that coin. Some of the machines detected it barely, some other more easier, with louder and clear audio response.
I am proud to say that my latest IGSL detected it as a piece of cake! Also my old SMW2 detected it pretty easy.
I also checked with Musketeer XS and 18cm coil (TS800). Weak detection, coil must be almost pushed to soil... but still detected!
Ok... that test was done. What was achieved with such test? Nothing really!
BUT! Keep reading this!
Next thing i done - i removed first 15cm of soil from a hole. Than i put piece of hotrock in it and again returned the rest of soil back.
Pay attention on this! Hotrock is NOT just near the coin - it is 15cm over the coin and 15cm under the soil level, covered with soil too (buried).
So... i took first of the machines to test. NOTHING! NO DETECTION AT ALL! Second detector... NOTHING! Third detector .. NOTHING.... !
I took 8 various metal detectors and tried.... NOTHING! NO DETECTION AT ALL!
Next 2 days i took 3 more metal detectors from a friends (XP GMP, DFX, Tejon) ... NOTHING!!!!
.....
So.... folks.... what are we talking about here all the time? Depths? Mha,mha,mha!!!!
.....
But wait! There is a hope! Minelab GP3000 DID IT!!!! Nice and clear DETECTION!!! With or without that damn hotrock - same DETECTION!
VLF's are definitely very LIMITED!
I can only wander... God knows how many gold coins i've been skipped so far in last 23 years of me being the prospector!??
And most of those nice gold coins were "deep" barely 5-10cm in soil!
So....
We have to put the finger on our heads and start to think; are we gonna chase more (only) depths... or we gonna finally make some REAL WORKING VLF!?
I wonder: was the GP3000 detecting the coin, or the hot rock? Did you try removing the coin and leaving the hot rock and see what GP3000 does?
This brings up a subject I am currently studying -- combined target signals. This is specifically related to synchronous detectors like TGSL has.
For example, what happens if nickel and silver coin side-by-side. If you set DISC to ignore nickel, will you detect the silver? What if you set DISC half-way between nickel and silver, will you detect the silver? Or if you set the DISC to just allow silver, will you still detect silver coin if nickel coin is next to it?
There is some theory that suggests that putting nickel next to silver will act like a metal that is half-way between nickel and silver, such as copper. I will soon test this with my Compadre.
It will depend on the size of the target responses also, so not exact. But it is an interesting question whether two different metals side-by-side cannot be detected separately because they will act like a single metal that is inbetween.
This makes me wonder about certain iron objects (conductive ones) next to coins. I think if you are just discriminating out iron, you are OK. But if you are discriminating all metals except silver, and you have iron next to silver, perhaps you will not see the silver.
Regards,
-SB
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