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My Take On Aftermarket Zed Coils

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Excellent result JW I knew it was a good coil.  And a good pick to dig the extra deep holes with ay, and nice looking gold as well.

cheers dave

 

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WTG JW, but you & Davsgold are the devils enticing me away from giving the Coiltek Extreme coil on the SDC a proper go, has me running around like a blue arsed fly. Yeah we`ve gone from bugger all coil choices for by my reckoning the two best gold detectors on earth, to many choices. Plus with the AMD on the way .........…. going from famine to perhaps glut, exciting stuff no...……. 

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Thanks for the report. Is there something special with the construction of these coils that the stock Minelab coil does not incorporate? A bigger coil should get better depth on bigger gold so that part isn't surprising to me, but to get better depth on the tiny bits with a larger coil seems to indicate these new coils are outperforming the stock coil size per size. If that's the case I'm left wondering why Minelab hasn't put out a better coil in almost 4 years now themselves. I see you mention spiral wound, I was under the impression that PI coil construction didn't apply to ZVT coil construction, do you mean both lobes and center coil of the 12" you mention spiral wound and in DoD configuration or is it something different? Given the number of windings, thin wire, and thickness of the Z coils I'm trying to visualize what spiral wound means in that context.

I know people abhor rebury tests. But I'm curious if anyone has plans to do a controlled comparison between the stock and X coil at the edges of detection to determine a baseline performance differential? Data is data, its the interpretation of data related to specific conditions that people get twisted up on I think, and a test like this is useful as long as the data is interpreted for what it is.

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Well done John, I had a feeling those coils were going to do something like that for you.  The bigger coil seems great, why not get the bigger deeper gold the 14" missed, much better than chasing the tiny bits, I think I know a place that big coil might do well, and it involves a big hike and a path that keeps on giving 🙂

That 3.3 gram piece is a nice looking bit, unusual looking for our gold and a very abnormal size for our gold :laugh:

It's going to keep you busy for a while now, going over all the old stomping grounds again!

You'll be going to work today with a smile on your dial.

10 minutes ago, jasong said:

I know people abhor rebury tests. But I'm curious if anyone has plans to do a controlled comparison between the stock and X coil at the edges of detection to determine a baseline performance differential? Data is data, its the interpretation of data related to specific conditions that people get twisted up on I think, and a test like this is useful as long as the data is interpreted for what it is.

What I know about JW is he covers ground insanely well, he spends a full day in a 20 foot by 20 foot area, going over it slowly from all directions, so for him to be shocked about getting gold out of ground he's flogged really shows the difference in these coils, especially when it's this much gold and a bit that big.

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Ah ha, JW just a query have you tried MLs 19", I know you got one. When I first saw your photos, years back, I reckoned it`d be the go in the deeper soil away from that bony stuff. As you know I`d found the 19" beat the 14" on about 2 gram and up at depth and has the sensitivity to almost compete with the 14" on the small stuff, be interesting to see it run with the aftermarkets, although I suspect the aftermarkets will make it redundant.

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3 hours ago, jasong said:

I see you mention spiral wound, I was under the impression that PI coil construction didn't apply to ZVT coil construction, do you mean both lobes and center coil of the 12" you mention spiral wound and in DoD configuration or is it something different? Given the number of windings, thin wire, and thickness of the Z coils I'm trying to visualize what spiral wound means in that context.

 

From what I have been told by the manufacture about the "Spiral wound" is the TX winding is the spiral or flat type winding and the RX windings are the more standard type of windings, I have not cut a coil open to have look. 😉

cheers dave

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1 hour ago, Norvic said:

Ah ha, JW just a query have you tried MLs 19", I know you got one. When I first saw your photos, years back, I reckoned it`d be the go in the deeper soil away from that bony stuff. As you know I`d found the 19" beat the 14" on about 2 gram and up at depth and has the sensitivity to almost compete with the 14" on the small stuff, be interesting to see it run with the aftermarkets, although I suspect the aftermarkets will make it redundant.

Just the weight of the GPZ19" coil, compared to the 17" X-Coil and the 18" X-Coil are about half a kg lighter in weight and dare I say go a bit deeper.

cheers dave

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Excellent report..and for those who have the gpz....you must be shaken at the bit to get a hold of these coils....I know I would be considering the results. 

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1 hour ago, davsgold said:

Just the weight of the GPZ19" coil, compared to the 17" X-Coil and the 18" X-Coil are about half a kg lighter in weight and dare I say go a bit deeper.

cheers dave

I`d like to purchase a replacement coil for the 14" once available, whether elliptical or round, thus if you are going to handle their sale in OZ I`ll place my order. Just advise once available and I`ll get the $s to you.

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