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Nice test, EMI must be slaughtering the test, I see the lobo had a short range on the wheat cent. I have that same coil on the Tejon and depth should be much much more.

Most vlf machines see a can end to about 2' with mid size coil but id accuracy is usually much shorter than that. I slapped a frequency reader posted somewheres on this site that when hooked to a scope you can see the target frequency of the machine when the tx and rx are in balance ie D2 9" coil is 9.5" but frequency will fall off quickly after that. This would be the raw signal (air test). Add in Ground phase and emi and that base balanced range is shorter making id's drift lower at lesser depths. Mid and low conductors have the greatest id drop.

The air space in the pvc tube may effect the accuracy of your test vs actually burying the targets. Easy way to test is to bury a target at same depth to compare to the pvc tube.

End of the day the test is probably a good baseline to get an idea of a machines capability. Nice work.

  • Like 2

Thank for all the comments and feedback.  I have been able to borrow some detectors and also invite friends over with their detectors to gather data.  I could glue the targets onto the wooden paint sticks at an angle such that they would be parallel with the surface.  Perhaps if I rebuild the test range. 

I should have made the tubes as small and long as possible with deeper depths.  I would use a small diameter tube for small targets and the larger tube only for the largest targets.  The range needs to be removed from nearby buildings and EMI.  This would likely improve result accuracy.

The wheat cent data may be in error.  It would be worth rechecking, but I would need to borrow the Tesoro Lobo.  The Tesoro Lobo is preferred by an archaeologist I am helping since nearly any novice can use the detector with little training.

The test range has been especially useful helping me understand the XP Deus 2 program differences and the settings.  I'm still learning the XP and hope to do some tests with non-ferrous hidden with ferrous targets.

The Garrett Axiom is surprisingly easy to use.  The range showed that for my purposes using medium speed was sufficient and the largest mono coil worked best for finding artifacts.

I'll record the manual ground balance readings off of the Axiom and the Deus 2 and post them here later.  The ground is mineralized with magnetite in the sand.

A photo of the test range tubes is attached.

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  • Like 7

*since the tests were performed on All metal .. we get quite detailed information on how the detectors will cope in such a situation...
the fact that the targets are tested at an angle also contributes to simulating a common situation in the field,,, where the object is in the ground at some angle..

according to the results, I expected...that the field must be mineralized with magnetite or maghemite..-because it causes quite a strong compression of the range of the detectors..both VLF AND PI..

For the complete perfection of the tests..it would be ideal to also test the VLF detectors in the discrimination mode..so that it would be possible to comparatively see how the VLF detector will cope in the all metal mode versus the Discrimination Mode..

 

I will tell you that I like it..that you do such tests as well as the assortment of targets... -so that you can verify the possibilities of the detectors on your field..and that's the main thing..

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Thank you El Nino77, good comments.  I have not tested any discrimination so far.  Until now my interest has been digging everything, whether relics or nugget shooting.  I will attempt to add discrimination data in the future.  Perhaps testing a silver coin or ring, followed by the same coin or ring with ferrous targets nearby.  Maybe a silver dime with two square nails on the same wooden stick, above and below the dime.  A silver ring with rusty metal can bits nearby.  Does anyone have suggestions how a realistic discrimination test could be simulated?  The goal would be to simulate what we typically experience in the field.  Thanks, Ed, SaddleBrooke, Az.

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 ED.....Thank you too.....👍:smile:..

 Simulating a depth separation test where a coin is on a nail on the same stick that is at an angle to the terrain is a really good idea... because in a simple way you can simulate different high positions of the iron against the coin... and at the same time do it at different depths - where the depth separation properties of each detector are also checked..

There is another effect of such testing... and that is that the detector response can also be tested in this way - the quality of discrimination --- for example, on the nails themselves used in the test which, with their depth of placement, can give a false signal to a non-ferrous target..

 

For me it is an important factor .. and I can assure you.. that the ratio of non-ferrous target... vs. iron... helped me pull out really good targets from old places that were heavily clogged with iron... also very often in umnmasking..

..Such separation tests will be really informative...

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Zord:  I left the Deus 2 silencer and stabilizer settings at the factory program.  Silencer on 1, ground stability on 2.  The Deus 1 silencer would also have been on the factory setting.  I have not yet tried any silencer or ground stabilizer adjustments.  Yet another variable to take a look at.

Nice, a lot of time invested, good for you.

Keep in mind that Fine setting with the Axiom is not always the best, depending mostly on target size. And will be very noisy on bad ground, often not even usable in ground I often hunt, just way too noisy compared to Medium or Large. 

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With Axiom it would still be worth testing on Fine vs Normal...I think it's worth it...

I would like to see how the MXT Pro works on different coils 6x8" Sef ,or 13" ultimate coil..in Prospecting mode on Hyper Sat-in High setings.. That may also be one of the favorites..for certain targets...in such magnetite terrain..

  • Like 1

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