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Date Posted: 09:23:39 08/16/02 Fri
Author: Ralph
Subject: High Frequency
In reply to: Reg 's message, "Re: I think you're on the right track......" on 02:02:48 08/16/02 Fri

Reg,

If memory serves correct, Compass had a couple of early machines that operated in the range of 100kHz (Groundhog perhaps?) that did very well on small gold.

I had considered the "ring" anomoly due to it's shape and ability to circulate a current, so clipped the ring to separate the circle when testing the prototype, and it made no obvious difference in the ability of the X-5 to detect it next to or around the nail.

Also did much the same as you describe in testing the nuggets next to or under the hot rocks from different directions, as well as with the rock in a fixed position to get some idea as to effects of extremely hot ground. One such rock was well over fist size when testing a small 3 grain piece, and when the rock and nugget were moved in tandem below the coil, the rock masked the nugget. However when the rock was used as a "ground simulant" in the fixed position and the machine balanced to the rock in all-metal mode, then switched back to discrimination mode, the nugget could be detected "through" the hot rock.

Something I've noticed about both the MXT and the X-5 is that both use a considerably higher gain level than most discriminating machines, to the point of being equal to (at least) the better gold machines on the market. I'm sure this is also something that should be factored into the equation of why these particular machines manage to perform as they do on tiny gold and perhaps even in conjunction with the hot rock separation issue.

Ralph

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