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Gold Prospecting
Metal Detecting for Gold
DD coil in mono mode? = Confused
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<blockquote data-quote="PhaseTech" data-source="post: 397251" data-attributes="member: 3149"><p>Perfectly explained in the user manual. Page 45</p><p><a href="https://www.minelab.com/__files/f/3965/4901-0063-1.1%20Instruction%20Manual%20GPX-4500_screen.pdf" target="_blank">https://www.minelab.com/__files/f/3965/4901-0063-1.1 Instruction Manual GPX-4500_screen.pdf</a></p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/3149/1521109553_coil_rx.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>If you look at that diagram, it's the DD position that is only using half the coil. One side to transmit, and one side to receive. In Mono mode, transmit is also on the left winding, but it receives off both windings. </p><p></p><p><u>11" DD coil in Mono</u>, think of it as having performance characteristics somewhere between an 11" DD and 11" mono. </p><p></p><p>- More Sensitive than a DD</p><p>- Less depth than an 11" round Mono</p><p>- Better ground handling compared to an 11" mono</p><p>- Not as quiet as DD mode</p><p>- Better EMI suppression compared to 11" mono</p><p>- MAY, in the right ground be able to use Sens Extra where you MAY struggle with a straight mono </p><p></p><p>The other way you could look at it would be to compare to an 8" mono. The 11" DD in Mono is essentially an 11x7" elliptical, so the 8" mono will provider a sharper response on most small gold, but the 11" would be superior in ground handling.</p></blockquote><p></p>
[QUOTE="PhaseTech, post: 397251, member: 3149"] Perfectly explained in the user manual. Page 45 [url]https://www.minelab.com/__files/f/3965/4901-0063-1.1%20Instruction%20Manual%20GPX-4500_screen.pdf[/url] [img]https://www.prospectingaustralia.com/forum/img/member-images/3149/1521109553_coil_rx.jpg[/img] If you look at that diagram, it's the DD position that is only using half the coil. One side to transmit, and one side to receive. In Mono mode, transmit is also on the left winding, but it receives off both windings. [u]11" DD coil in Mono[/u], think of it as having performance characteristics somewhere between an 11" DD and 11" mono. - More Sensitive than a DD - Less depth than an 11" round Mono - Better ground handling compared to an 11" mono - Not as quiet as DD mode - Better EMI suppression compared to 11" mono - MAY, in the right ground be able to use Sens Extra where you MAY struggle with a straight mono The other way you could look at it would be to compare to an 8" mono. The 11" DD in Mono is essentially an 11x7" elliptical, so the 8" mono will provider a sharper response on most small gold, but the 11" would be superior in ground handling. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
DD coil in mono mode? = Confused
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