Air Tests for PI/VLF machines May 14, 2016 04:45PM |
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pimento
If you want to do a proper comparison, do both the air-test and the ground-test in the same location, at the same time.
Re: Air Tests for PI/VLF machines May 15, 2016 07:19PM |
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Re: Air Tests for PI/VLF machines May 16, 2016 01:57AM |
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Re: Air Tests for PI/VLF machines May 16, 2016 12:29PM |
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I have no electronic background but once had a detector's radio signal described to me by a Navy man who was trained on sonar and radar and all things related. He said a detector's signal would always work at its best potential in the air where the minimal interference existed. A vacuum chamber is the only environment that would be better for it to work in. Needless to say we don't live in a vacuum. He went on to say any water or dirt you will encounter can only absorb or block your detector's signal.
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I just got off the phone with an engineer at Fisher Research Labs and this is what he told me: "Only in very rare conditions will a detector read deeper then it reads in an air test. We have units that air test at 14" but in actual hunting conditions they will only go to about 9 inches."
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physics is physics. If a specific transmitter with long wave propagation characteristics (2.3-70 Khz) with a set RF power output such as a metal detector has a specific transmitting range and detection, it will be ideal and optimal in air. Ground loss tangent, eddy currents, magnetic inhomogeneities associated with minerals and other factors will mean there will always be a net loss in ground unless volume density reduction is involved or water saturation enhances propagation. Assuming a metal detector has the right processing hardware, software and properly coded algorithms in the spatial frequency domain, detection range will always be best in air assuming the above did not take place. The air test is great for determining free air loss characteristics and ultimate potential of a metal detector in non-mineralized loamy or sandy soil. A metal detector with the right hardware and software that air tests very well will usually (not always) perform better than one that does not air test as well.
Example, two Etracs one with a specific software version (v3) that codes a mineral gradient different than say Etrac number 2 with a different firmware and hardware surface mounted components and PCB. Version 3 air tests at 13" on a quarter version 2 air tests at 10" on a quarter. Version 3 will have better in ground performance than V2. This is why you see F75 and F75 LTD, SMALL CHANGES IN HARDWARE AND SOFTWARE. The LTD version will air test significantly better in air and ground!
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