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Date Posted: 08:38:09 08/02/02 Fri
Author: James McCulloch
Subject: Air tests vs. in-ground tests

While air tests have their place when comparing the perfomance of various detectors, we need to remember that an air test is not as true a test as an in-ground test. And even when performaing air tests, we need to be sure that all detector settings are correct. In a previous post Dave reports seeing an in-air test done with the X-5 and a GMT, wherein the the X-5 got 16" on a 11.93 gram nugget, and the GMT got 9 inches. When air testing ANY autotracking unit, such as the GMT or MXT, the autotracking feature MUST be turned off, otherwise the detector will attempt to track to the nugget, and poor performance will ensue. Testing my GMT on a 9.7 gram nugget (thus 81.3% as large as Dave's) WITH THE AUTOTRACKING SHUT OFF I got 14 inches in-air, thus 87.5% of the distance the X-5 got. So, as can be seen from this, don't air test an autotracker in-air. On to another topic: I read, with interest, Ralph's post regarding in-air tests involving the X-5 on small nuggets while operating in the discriminate mode. He found that he could get a signal on a 1.3 grain nugget "4 or 5 inches" at iron-level reject. Incredulous, I then attempted to do the same testing with the MXT. With the standard 950 loop, at nail-level discriminate, I got a full (measured with a wooden ruler) 4 inches (in air) on a chunky 1 grain nugget. I did not believe this could be done; I agree with Ralph that this new technology opens up new vistas for nuggetshooting in the discriminate mode. I have just learned that some nuggetshooters are using the MXT in the RELIC mode for gold hunting, thus MISSING the iron targets, but still getting great depth on tiny nuggets. Gotta investigate this when I get the time. There is a downside to all this new technology; I will likely have to re-write "Advanced Nuggetshooting." HH Jim

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