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Metal Detectors
Minelab
Minelab Vanquish (340 440 540) tips and questions
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<blockquote data-quote="grubstake" data-source="post: 552119" data-attributes="member: 4012"><p>I'm not familiar with the details of the V540's notch discrimination system, but the upper limit of your discrimination setting is almost certainly causing a problem. I'm assuming you set this at 40 to avoid the copper and aluminium trash? Small ferrous trash (iron/steel) is relatively easy to discriminate out and small aluminium foil shreds can usually be blocked too, but discrimination settings higher than this risk blocking desirable targets. You probably cannot search for a medium/high conductivity target such as 22 karat gold AND eliminate high conductivity copper and aluminium at the same time, as the target ID numbers will likely overlap.</p><p></p><p>Incidentally, neither a natural gold nugget nor a $1/$2 coin will give you clear guidance as to the likely target ID for a 22 karat Krugerrand. I'd guess that a Krugerrand would produce a higher ID number than a $1.</p></blockquote><p></p>
[QUOTE="grubstake, post: 552119, member: 4012"] I'm not familiar with the details of the V540's notch discrimination system, but the upper limit of your discrimination setting is almost certainly causing a problem. I'm assuming you set this at 40 to avoid the copper and aluminium trash? Small ferrous trash (iron/steel) is relatively easy to discriminate out and small aluminium foil shreds can usually be blocked too, but discrimination settings higher than this risk blocking desirable targets. You probably cannot search for a medium/high conductivity target such as 22 karat gold AND eliminate high conductivity copper and aluminium at the same time, as the target ID numbers will likely overlap. Incidentally, neither a natural gold nugget nor a $1/$2 coin will give you clear guidance as to the likely target ID for a 22 karat Krugerrand. I'd guess that a Krugerrand would produce a higher ID number than a $1. [/QUOTE]
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Metal Detectors
Minelab
Minelab Vanquish (340 440 540) tips and questions
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