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The GP series is a DD unless you can see 'mono' on the label.

The other one looks like its wired as a DD. The Double D has two loops of wiring (like reversed Ds - hence DD) which overlap in the middle of the coil. One coil is used as a transmit and the other as the receive signal antenna, but the brand is ?

The best way to test an unknown coil with the PIs is to put iron reject ON and way a piece of ferrous metal at it. If it blanks out, its a DD, if it has a melt down and warbles and spits and farts - its a mono.

The settings look fine to me. The gain and stabilizer should, as you show, not usually be more than two numbers apart (generally).

Now, a good coil... this will start some arguments but with my 4500 I have:

11" minelab mono, 11" minelab DD, 14" minelab DD, 18" minelab DD, 8" coiltek mono and a 14 x 7 nugget finder (NF) mono. I love the NF for general stuff and it paid for itself within an hour of buying it! The 8" is for playing on mullock heaps with the grand kids and its bloody deadly on small stuff. I use an xterra 70 with 10" for quartz specis on dumps.

Good luck mate.

<blockquote data-quote="loamer" data-source="post: 32441" data-attributes="member: 981">The GP series is a DD unless you can see &#039;mono&#039; on the label. The other one looks like its wired as a DD. The Double D has two loops of wiring (like reversed Ds - hence DD)&nbsp; which overlap in the middle of the coil. One coil is used as a transmit and the other as the receive signal antenna, but the brand is ?The best way to test an unknown coil with the PIs is to put iron reject ON and way a piece of ferrous metal at it. If it blanks out, its a DD, if it has a melt down and warbles and spits and farts - its a mono. The settings look fine to me. The gain and stabilizer should, as you show, not usually be more than two numbers apart (generally).Now, a good coil... this will start some arguments but with my 4500 I have:11&quot; minelab mono, 11&quot; minelab DD, 14&quot; minelab DD, 18&quot; minelab DD, 8&quot; coiltek mono and a 14 x 7 nugget finder (NF) mono.&nbsp; I love the NF for general stuff and it paid for itself within an hour of buying it! The 8&quot; is for playing on mullock heaps with the grand kids and its bloody deadly on small stuff. I use an xterra 70 with 10&quot; for quartz specis on dumps.&nbsp; Good luck mate.</blockquote>

[QUOTE="loamer, post: 32441, member: 981"] The GP series is a DD unless you can see 'mono' on the label. The other one looks like its wired as a DD. The Double D has two loops of wiring (like reversed Ds - hence DD) which overlap in the middle of the coil. One coil is used as a transmit and the other as the receive signal antenna, but the brand is ? The best way to test an unknown coil with the PIs is to put iron reject [b]ON[/b] and way a piece of ferrous metal at it. If it blanks out, its a DD, if it has a melt down and warbles and spits and farts - its a mono. The settings look fine to me. The gain and stabilizer should, as you show, not usually be more than two numbers apart (generally). Now, a good coil... this will start some arguments but with my 4500 I have: 11" minelab mono, 11" minelab DD, 14" minelab DD, 18" minelab DD, 8" coiltek mono and a 14 x 7 nugget finder (NF) mono. I love the NF for general stuff and it paid for itself within an hour of buying it! The 8" is for playing on mullock heaps with the grand kids and its bloody deadly on small stuff. I use an xterra 70 with 10" for quartz specis on dumps. Good luck mate. [/QUOTE]

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