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Gold Prospecting
Do It Yourself (DIY) Projects
Surf Pi Build + inbuilt pinpointer
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<blockquote data-quote="Ben78" data-source="post: 58203" data-attributes="member: 206"><p>Ben</p><p></p><p>I have a couple of questions regarding your comments above.</p><p></p><p>1. Does a surf pi need 300uH inductance? <strong>Yeah about that, could be mH though?? It's not exact there is a lot of room to move on that.</strong></p><p></p><p>2. How did you wind your coil? <strong>Made a few types, Made a plywood form and wrapped the wire on that, use cup hooks in a board and wrap on that etc</strong></p><p></p><p>3. Have you experimented with different types of coils and if so what works best? <strong>Yeah, mono round coils get the best depth but I have done a 11x8 elliptical and a 11" spiral. The spiral had great sensitivity to small objects and good depth too. Tesoro use spiral coils on their PI machines. </strong></p><p></p><p>4. What do you mean by zero discrimination? Are you saying it cant discriminate at all? <strong>Yep, no discrimination at all. You can disc out tiny bits of foil by turning the delay up, but then you lose the smaller bits of gold jewellery and still get the rusty jetty bolts 2' deep...</strong></p><p><strong></strong></p><p>Thanks Peter</p></blockquote><p></p>
[QUOTE="Ben78, post: 58203, member: 206"] Ben I have a couple of questions regarding your comments above. 1. Does a surf pi need 300uH inductance? [b]Yeah about that, could be mH though?? It's not exact there is a lot of room to move on that.[/b] 2. How did you wind your coil? [b]Made a few types, Made a plywood form and wrapped the wire on that, use cup hooks in a board and wrap on that etc[/b] 3. Have you experimented with different types of coils and if so what works best? [b]Yeah, mono round coils get the best depth but I have done a 11x8 elliptical and a 11" spiral. The spiral had great sensitivity to small objects and good depth too. Tesoro use spiral coils on their PI machines. [/b] 4. What do you mean by zero discrimination? Are you saying it cant discriminate at all? [b]Yep, no discrimination at all. You can disc out tiny bits of foil by turning the delay up, but then you lose the smaller bits of gold jewellery and still get the rusty jetty bolts 2' deep... [/b] Thanks Peter [/QUOTE]
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Gold Prospecting
Do It Yourself (DIY) Projects
Surf Pi Build + inbuilt pinpointer
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