HOW CAN A 9 INCH COIL AIR TEST THIS DEEP??

[calabash digger]

rutus great machine know a few who have got it and had it very good for the money too. In ground its not as deep from what those users said but it looks like a very deep machine might be a better deal than the at series for the money about the same price. downside no us service center and not water proof.

 

[vlad]

put it in stat mode...........air tests will boggle the mind.....un-be-lievable!
What it will do in the ground is astounding.....you better have a big shovel.

 

[vlad]

Get in some really bad dirt like the red clay in E. Texas or what they have in Alabama and 4-5" is doing good.
Throw in bad negative ground and wet salt, and even P.I.'s have limits. (I can take you to a place west of Sabine Pass where the ground balance can move,
in extremis, in 2", & VLF's are useless. Its a P.I. or nothing. (empirical results)

 

[Architex]

Don't think you read my post very carefully.

 

[Architex]

Do you have a video? Would really like to see that.

 

[vlad]

I'm sure there are those who do..........

 

[Doctorcoinz]

Air tests prove very little , i have seen detectors that can pick a large coin up at 18 inches in air, same coin in my back garden maybe 6 inches!.

 

[Doctorcoinz]

The air test is only valid if the ground is clean. .. I can never get anywhere near the air test depth in ground..

 

[steve herschbach]

A test in air, comparing machine to machine, is a fair test of comparative depth expectations in dirt. Depth in dirt will be less of course, but relative strength will be comparable.

Not true. Air tests do nothing to measure the efficiency of a detectors ground canceling capability and are easily manipulated. In general high frequencies will air test better than low frequencies. Single frequency machines generally air test better than multifrequency machines. VLF detectors generally air test better than PI detectors. Those results can flip 180 degrees in the moderate to highly mineralized ground. Low frequencies inherently penetrate bad ground better than high frequencies. PI detectors inherently penetrate bad ground much better than VLF detectors. Air tests can be informative but about the last thing they prove is how well a detector handles the worst ground conditions. You need the ground for that.

 

[Southwind]

OK obviously ground conditions play a role in depth we all already know this. What the common sense people are trying to point out is the FACT that in neutral ground conditions then air test comparisons are pretty darn accurate. That is to say if a detector air tests at 9" on a dime and another detector air tests the same dime at 12", chances are pretty darn accurate that the one that tested at 12" will average better depth in most cases. Pretty simple really.

Throwing in all the if, and or buts won't change the facts.

 

[Architex]

I don't have bad ground so.........

 

[Architex]

OK, I found some videos. F75 is pretty impressive.