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Gold Prospecting
Metal Detecting for Gold
Detech Ultra V Nugget Finder.
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<blockquote data-quote="ProspectorPete" data-source="post: 495366" data-attributes="member: 3820"><p>Graham, I've always been told that the round coils punch slightly deeper than the elliptical (oval) coils.</p><p>eg: a 14x9 to calculate it's closest round equivalent is 14 + 9 = 23, then divide by 2 = 11.5 hope that makes sense.</p><p></p><p>I've seen tests done comparing the NF evo 14x9 to the 12" evo round was that the 12 punched slightly deeper and the 14x9 more sensitive and easier to pinpoint at the toe of the coil.</p><p>Similar results with between the 15" round and 17x13" (which equates to 15" using the above calculation of add both and divide by 2), the results were only minimal but enough to say there's a difference in coils</p><p></p><p>So if you are finding the 14x9 punching deeper than the 11" round it may have more to do with the different makes of coil (?)</p><p></p><p>I have both the 12" and 14x9" NF evo coils and find the same as the tests between the two, I find the 14x9 more sensitive to EMI and I can't run it as hot as the 12" round but it has it's advantage of being able to poke that pointy end into all the nooks and crannys better than the round coil so for me it's worth having both coils and use the coil that best suits the ground conditions I'm going to detect.</p><p></p><p>Hope that helps a bit.</p></blockquote><p></p>
[QUOTE="ProspectorPete, post: 495366, member: 3820"] Graham, I've always been told that the round coils punch slightly deeper than the elliptical (oval) coils. eg: a 14x9 to calculate it's closest round equivalent is 14 + 9 = 23, then divide by 2 = 11.5 hope that makes sense. I've seen tests done comparing the NF evo 14x9 to the 12" evo round was that the 12 punched slightly deeper and the 14x9 more sensitive and easier to pinpoint at the toe of the coil. Similar results with between the 15" round and 17x13" (which equates to 15" using the above calculation of add both and divide by 2), the results were only minimal but enough to say there's a difference in coils So if you are finding the 14x9 punching deeper than the 11" round it may have more to do with the different makes of coil (?) I have both the 12" and 14x9" NF evo coils and find the same as the tests between the two, I find the 14x9 more sensitive to EMI and I can't run it as hot as the 12" round but it has it's advantage of being able to poke that pointy end into all the nooks and crannys better than the round coil so for me it's worth having both coils and use the coil that best suits the ground conditions I'm going to detect. Hope that helps a bit. [/QUOTE]
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Metal Detecting for Gold
Detech Ultra V Nugget Finder.
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