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  1. #1
    us
    Jun 2010
    east texas
    Delta 4000 and Garrett 300 Teknetics T2 Minelab Explorer SE Pro
    690
    45 times
    All Types Of Treasure Hunting

    Air test vrs. field test

    under normal conditions should the depth be about the same?

  2. #2

    Re: Air test vrs. field test



    Yes, pretty close. You'll read plenty of people say certain detectors do better in the ground than in an airtest, like my Explorer... but that's not really the case. I think a halo does make a detector like the target better, but don't think there's much of a difference in depth. (Seems like a contradiction but that's my experience) My detector will airtest a small silver coin about as deep as I've ever dug one, and am pretty sure it would be the same for all other targets too. In many cases the airtest can be better, and the ground killing some of the depth on certain units. Where real in the field experience counts is all the variables that are thrown in.

  3. #3

    Oct 2005
    XLT, Whites D.F., Treasure Baron, Deepstar, Goldquest, Beachscan, T.D.I., Sovereign, 2x Nautilus, various Arado's, Ixcus Diver, Altek Quadtone, T2, Beach Hunter I.D, GS 5 pulse, Searchman 2 ,V3i
    1,629
    135 times
    All Types Of Treasure Hunting

    Re: Air test vrs. field test

    I've got machines that air test to 16 inches. You might get 10 inches in good ground and I've a few bad sites were the depth comes down to 2 inches.

    The old "Testy" (Polish testing site I think) was interesting as it demonstrated that some of the flagship machines of the time (just pre the Explorer coming out) lost most depth between air and in ground tests. Didn't mean the most expensive detectors didn't still have an edge but perhaps not enough to justify the extra cost. XLT with stock 9.5 coil tested 30cm in air but only 21cm in ground. The far cheaper Quantum XT (9.5 coil) air tested 26 cm and 20cm in ground so almost the same performance as the XLT.

    My own test with a Whites Classic III (9.5 coil) showed a 9 cm difference but swapping to an 8" coil the in-ground loss was only 4cm. I assume the extra size of the bigger coil pushed the detector beyond its ability to cope with the ground minerals. Minelab BBS/FBS have always been a little odd as they don't like air to much. With a Sovereign "Auto" will not test well in air as its trying to automatically adjust sensitivity to the ground conditions and there aren't any.

  4. #4
    Charter Member
    us
    Bill Jones

    May 2007
    Lewiston, Idaho
    Multiple Tesoros and Whites
    1,211
    272 times
    Metal Detecting

    Re: Air test vrs. field test

    This is just my very untested, non-scientific opinion. If you could compare in truly neutral, non-mineralized soil, I think the difference would be little to none. However in real life field test the soil will vary sometimes considerably from location to location and under those conditions I'm sure the in ground depth will always be somewhat less to quite a bit less depending on all the variables. Just my two bits.
    HH
    luvsdux

  5. #5
    us
    Apr 2005
    925
    96 times

    Re: Air test vrs. field test

    Whereas an air test has no variables whatsoever, in the ground, many variables come into play. Moisture, mineralization,and conductivity of the soil, will have a huge impact on depth. Iron or other magnetic materials effect the ground balance severly on most detectors, rendering some detectors almost useless. In a soil absent of mineralization and with the proper amount of moisture, it could be possible to attain the same depth as in an air test. Happy Hunting. rockhound

  6. #6

    May 2005
    675
    28 times

    Re: Air test vrs. field test

    I seem to lose 40%-60% in my ground compared to air. The professional field testers seem to get coins at the full air test range even in rather mineralized ground with correct IDs most of the time. When I see they got a coin down 7" I tell myself that detector will do 4" in my soil. HH, George (MN)

  7. #7

    Re: Air test vrs. field test

    Quote Originally Posted by George (MN)
    The professional field testers seem to get coins at the full air test range even in rather mineralized ground with correct IDs most of the time.

    Professional = paid for their tests which = don't believe everything you read.

  8. #8
    us
    Nov 2008
    Toll Free ~ 855~966~3563
    12,715
    76 times
    Relic Hunting
    Banner Finds (1)
    Honorable Mentions (2)

    Re: Air test vrs. field test

    Quote Originally Posted by Iron Patch
    Quote Originally Posted by George (MN)
    The professional field testers seem to get coins at the full air test range even in rather mineralized ground with correct IDs most of the time.
    I would like to meet a professional air tester someday.

    Professional = paid for their tests which = don't believe everything you read.

  9. #9
    Charter Member
    us
    treasurelagoon.wordpress.com

    Jun 2010
    Wherever there be treasure!
    An older blue Excal with connector, remote, Skullie headphones, and various coils. Got rid of the rest of my machines.
    8,636
    2876 times
    All Types Of Treasure Hunting

    Re: Air test vrs. field test

    Hu........interesting. I seem to get just the opposite results, "my machines hunt deeper in the field then during an air test" and with identical targets. Take a handful of coins and air test each one, then dig yourself a few holes of various depths and take turns burying the same coins one at a time and fill the holes back in over the coins. I've done this many times and my machines almost always read deeper then in an air test. My hunting partner and I have done this many times while comparing different machines, settings, and coils. Seems we always get deeper and better results in the field.
    "Treasure is wherever it can be found."

  10. #10

    Re: Air test vrs. field test

    Quote Originally Posted by bigscoop
    Hu........interesting. I seem to get just the opposite results, "my machines hunt deeper in the field then during an air test" and with identical targets. Take a handful of coins and air test each one, then dig yourself a few holes of various depths and take turns burying the same coins one at a time and fill the holes back in over the coins. I've done this many times and my machines almost always read deeper then in an air test. My hunting partner and I have done this many times while comparing different machines, settings, and coils. Seems we always get deeper and better results in the field.

    You must have some mineralized air.

 

 

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