These images are of a 10 inch x-coil that I purchased off a fellow detectorist for $60. The coil was faulty with a lead wire issue and sold to me as I was curious about:
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A. the possibility of repairing it and;
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B. if I was unable to repair it, I was interested to see what was inside.
While it may look rather simple with bundles of copper wire windings, the amount of time and effort that would have gone into working all the electrical equations for RFI and EMI etc, etc, would have been astronomical.
Add to that having to hand make each coil, checking all the winding for quality assurance, then individually packing and sending these coils around the world, I can understand why they cost so much. I will admit that I am a fan of these coils and have found enough gold to make purchasing them worthwhile.
I hope you enjoy having the ability to see inside one of these coils and along with Woody’s video, have a better understanding why people like me cannot help but rave about these X-Coils!
Images of an X-coils wiring
The 10 inch DOD X-coil
Wire threaded to conductive painted shield (black). The grey compound used to stabilize the foam core to the outer cover was like a dense silicone compound. The rib marks are for better grip and stability of the internals.
Note the entire surface including the sides are painted with black conductive paint. Possibly high frequency conductive paint or a proprietry blend?
Rubber compression seal and spiral support on coil cable as it enters the coil body.
Here we can see the hot glue (white) which looks like it was used to hold things in place before applying the final glue compound (yellow). The smaller bundled wires are wrapped securely in place as are the thicker wires below.
Separating the coil covers with a hacksaw blade to create a ridge to run a very sharp knife around revealing the inner foam core.
The enamel coated copper wires have visible wrapping while the intersection of cables appears to have various adhesives used to secure in place during construction steps.
The wire to the shielding side seems to be separately constructed the twist-joined together during assembly.
Clearly visible is the Minelabs DOD coil pattern designed to utilize their Zero Voltage Technology (ZVT).
2 x TDK quality EMI filtering Ferrite cores. Also visible are the two white supports bound to the outer (in this image layout) coppers cables.
This is the main windings for the X-coils. The diagnal marks on the foam are “cuts” that act to give the bonding adhesive more surface area to keep things secure inside.
So, while this really doesn’t reveal too much about X-coils secrets into making their coils the best in the world – sensitive, light weight and stable, it does let you see the amount of work that goes in to these high quality, hand made coils for your GPZ 7000.
GPZ 7000 in depth look at the other brand detector coils, good bad or ugly, i call it as it is.
COURTESY: Woody@Detectormods
Detectormods Website
Much appreciation to Woody in analyzing the 10 inch X-coil on his video. Woody is an endless wealth of information and reasoning, please visit his YouTube channel and his website for more information about his products and services.
Answering a few points that Woody bought up;
▶ This was an old/earlier 10 inch DOD coil that had plenty of use.
▶ I don’t know if the design has changed, but I had one of these 10 inch X-Coils and it was my “go-to” coil for every occasion. With the 10 inch X-coil I got a lot of small gold around 0.2g at up to 4 inches and a lot of 1-2g gold including once getting a flat 1.5 gram piece at a little over 12 inches behind a tree stump.
▶ The reason Woody was unable to dive into this coil further is that September last year we had a significant fire on our property and lost an exorbitant amount of items including the 10 inch X-Coil.
A few days later, my web server in the USA decided to give up a hard drive with all my websites on it. All my back-up equipment and files was in the shed that went up in flames. The company that hosted my websites fortunately allowed me to acquire the faulty hard drive for forensic inspection.
I was able to receive about 90% of all content and around 50% of images. So, the slow and tedious rebuild is underway for the websites, unfortunately as with all insurance issues – it will be some time before our structures and shed/workshop are rebuilt.
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