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Years ago, when I learned how EMI affects a detectors performance I did a simple study. I took my detector to many different locations to determine the maximum air distance of a US dime from the coil, using the most stable settings at the time. I used the greatest distance as a starting point to near zero EMI affect on my detector. I then marked the maximum distance I could obtain on the lower shaft (12" for the Equinox). So now, when I go hunting, I can get a good guess by air testing the machine, if something is wrong with either the machine or maybe even silent EMI (not audible chatter).
Looking at the picture, I have a mark at about 12" which is the maximum distance I can get using a US dime and the Equinox after the best settings and noise cancel. It is surprising, just how many times I can't get a repeatable audio at 12" regardless of my settings (effects of EMI). But moving only 20', things might change, better or worse. This works good on all the detectors I've ever used. The F75 tends to be affected a little more by EMI but the maximum air test is quite a bit more than the Equinox. Both machines have places where they outperform the other.
Looking at the picture, I have a mark at about 12" which is the maximum distance I can get using a US dime and the Equinox after the best settings and noise cancel. It is surprising, just how many times I can't get a repeatable audio at 12" regardless of my settings (effects of EMI). But moving only 20', things might change, better or worse. This works good on all the detectors I've ever used. The F75 tends to be affected a little more by EMI but the maximum air test is quite a bit more than the Equinox. Both machines have places where they outperform the other.