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That is a nicely organized effort that will be a very useful reference for you.

  • Like 1

Thanks for sharing your results, always like seeing performance differences on the top end detectors. This helps me in reducing the redundant outdated detectors and coils.

I wish the EMI didn’t mess with your 7000 performance but it is a factor one should consider in picking which detector to use for where you’re planning on detecting. 

My back yard is too close to the house for effective pulse induction detector testing.  I hear EMI from the house wiring.  Interestingly, I can also hear the Jim Creek Washington VLF submarine transmitter on the XP Deus 2 at 24 kHz.  The coil sensitivity null points in the direction of Washington state.  If I do a frequency scan the Deus moves off of 24.0 kHz by some slight amount and then it works ok.  I suspect some detector EMI heard is RFI from high power transmitter sites.  Jim Creek runs about 1.2 mega-Watts and is the largest VLF signal seen in Arizona.

  • Like 2

It's definitely a tough terrain...,, strong Maghemite? ..


...I see that you do systematic testing... and it's very good that you decided to test the detectors on your terrain..

 

Very good tests thx . They confirm my own tests and conclusions.

In summary the recent SMF detectors have more or less the same performances ;  6 - 7 inches for a silver quarter for example.

And the PIs go around 40% deeper than the VLFs , which means around 9-10 inches for the PIs on the quarter , which is exactly the results of the GPX6000 in your test : 9.7 and 7000 : 10.1   ( unfortunately without iron disc )

And this explains why I am always sceptical when I read or hear about VLF detectors detecting a medium sized coin at 15inches or even more . No miracle with the laws of physics ..

  • Like 1
12 hours ago, JCR said:

That is a nicely organized effort that will be a very useful reference for you.

For me too ... 🙂

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I have a similar test setup in my yard, 30 degree angle.  You sure collected a lot of data!  Couple questions:

1) Do you have a mineralization measurement for this ground?  Doesn't the Deus 2 have such ability?

2) Can't you modify your holder to orient the coins parallel to the surface?  This would give more meaningful (and more easily comparable/reproducible) depth limit measurements.

The Tesoro Lobo Supertraq seems to do quite well here for some targets.  Did you just generate an explosion in its value?  Or is this a case where you say you need to repeat some measurements?

  • Like 3

You did a lot of hard work on this job, which I'm sure it was fun. Love the details on all. Once you start to expand to different areas should be interesting to see what affects what.

I see all as a big plus... you learn a lot about your detector and your area when doing any kind of testing. I've done many test over the years, (Air, Buried in the sand, the buried tube test, and real world virgin targets). Most ....with just two machines, the two I use all the time. Fisher AQ and then the Minelab Excalibur. I rarely keep a log but I do video all which helps me more since I can hear the audio response of the faintest to shallowest. 

Most don't like air test but I do think a lot can come from them on how a targets responds, in relation to the same target but different test, than when testing different head phones. I do make my own head phones and feel factory (Stock) phones are weak and lacking when it comes to squeezing ever last drop of audio out of them.

95% of the time I only use diff gold rings and a US nickel... most of the testing involves sand and brackish water.

So my questions is.. Has your testing helped your detecting skills?

  • Like 4

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