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  1. While reviewing some more of my archived files I found the coil winding specifications for one of White's Electronics BFO metal detector coils. Data was provided by the White's Factory. This coil was called the "Triplet Coil". It was manufactured in the late 1960's and early 1970's. My information is from May 1969. During this period there were several BFO coil sizes offered: a 3-inch coil for nuggets, a 6-inch coil for coins and a 12-inch coil for large objects. The Triplet was designed to combine both the standard 6-inch coil and the 3-inch nugget coil with an additional 2-inch coil for added sensitivity for small objects. Single coils were wound using a wood based enclosure. The Triplet Coil was encased in a molded plastic housing. For those of you who have a vintage White's BFO metal detector and would like a combination coil or those of you who wish to build a replica of a vintage White's BFO metal detector I have attached a PDF of the winding details for your viewing pleasure. BFO Triplet Coil winding instructions.pdf
  2. Gary Blackwell has a new video on the new 13 inch coil: https://www.youtube.com/watch?v=2vVI5by5apc&ab_channel=Themetaldetectingskillschool
  3. trying to decide , 11inch coil x35 or the 11x13 x35 anyone have experience with both
  4. The chart shows current GPX-6000 coil sizes, weights, and areas. I hope this chart can help you find out which coil to bye in the future. Phrunt- the 6 X 8.5 specifics have been added to the chart.
  5. But how is it for pinpointing? 🤦‍♀️
  6. I've watched a bunch of videos showing the Nexus coils doing air tests and on newly buried dirt with a GPX 4500, but can't find anyone that has done a video showing it in real action on undug targets. Has anyone tried these coils? I'm going to assume since the videos were done in places that appeared to be away from a lot of EMI, that they probably do better in the woods than at the shore where I would want to try them. I did see them hunting some serious magnetite laden soils though. Impressive, but not enough for me to try one without hearing some feedback on them. Anyone ever use one? Thanks.
  7. I'm looking for opinions on the Minelab 6 inch vs the Coiltek 10x5 for my Nox 600. I search a lot of trashy and brushy sites. Anybody have any experience with both coils? Any opinions? Thanks.
  8. Hello Guys! How Do Different Coils Affect The Performance Of A Metal Detector?
  9. Merhaba arkadaşlar sizce 18 elite mono veya 18 inch commender monomu başarılı
  10. Hey all, I just found my coil connection sheared off at the control housing. (oops, and bad timing as I was just headed out!) Luckily no damage to the control housing connection but the other end was bent and broken right off... I sent some photos to minelab to asses if they will fix it or not but still waiting. I was wondering if anyone knows if its possible to buy this connector anywhere? If minelab wont fix it then I will end up splicing one on myself and hope for the best (minus the water tightness of course) . Any help would be so appreciated!
  11. Curious if the Infinium coils are compatible with the Seahunter. I hunt some crappy ground where a pi would be usefull and the mono coils get slaughtered with emi. My thoughts the 5x10 would do well not only for emi but because it is a closed coil it will be easier to work the gravel and rocky beds.
  12. Hi everyone, A few years back, I came across an older Metal Detector at a garage sale and it came with a “Bigfoot Coil” , I thought I’d be using it more often than I was and decided to see how much they cost. After a Google/eBay search, I listed it on eBay for a price that I felt was fair that they were selling for. I ended up finding someone interested in it on eBay and sent it out to them for cheaper than I even had it listed for, as well as paying for the shipping. About a week after he received it, he sends me this message; "I finally have a chance to check out the Bigfoot coil you sent and thought after hooking up to 1 of my 3 DFX detectors that this is not the correct coil as you have listed for DFX. I went in the basement and found my DFX Bigfoot coil I have not used in several years and testing them against one another. You coil has to be for different frequency Whites detectors as it’s different looking upon top of coil and testing with my wedding ring I get a pretty consistent 20-22 VDI which is normal number even with 9 1/2” coil and with Bigfoot coil it shows a VDI number of close to 85 consistent so I would like to receive a return label as this coil you sent is not correctly working for a DFX.” Just wondering if I can get some input from someone that actually knows what he’s talking about 😅 from what I originally saw, it looked like the BigFoot Coil only came in one model? But could there be different types? I’d really hate to pay shipping again and go through all the hassle of returning it and trying to resell it again. Any help or input is appreciated! Attached are pictures of my Bigfoot coil , and the last picture is a pic he sent in comparison to his other one. Thank you in advance!
  13. So most detector companies make different coils for their machines. So why don't they optimize programs for specific coil sizes? For instance with the Equinox would using Park1 with the 11" work just as good if you changed to the 6" changing nothing. You could go into Coil Size in settings and designate what coil your using and once done the detector would change each factory program to be optimized for the size coil you picked. I know optimized for one site might not be optimized for another, but factory settings have to be set where they are for a reason. It just seems that changing coils should require Sensitivity, Recovery, and maybe even frequency tweaks etc. to get the most out of a smaller or larger coil. It seems like a selling point to me.
  14. GPX 6000 coil makers information Nugget Finder Xceed 6000 series Nugget Finder has now announced there will be 3 Minelab approved coils in the Xceed 6000 range at this stage. It looks like there will be Mono coils in 8x6", 12x7" and 16x10" sizes, which represent some great options for bushy or tight spots! If you would like to be kept in the loop regarding pricing and release date, visit our website here and click on the size or sizes you are interested in and hit the 'Notify me' button to receive news as it comes in! Coiltek Goldhawk Gpx6000 Series Coils Will be available in 3 sizes - 10x5", 9" and 14x9" Mono configuration Precision pinpointing and great manoeuvrability Fully approved by Minelab Visit our website here and click on the size or sizes you are interested in and hit the 'Notify Me' button to receive info on pricing and release date as it comes to hand. Once we have firm intel from Coiltek we will begin taking pre-orders!
  15. What was your last detector related purchase? Let's do our best not to stretch this too far..... a new winch for your gold getting rig counts, a new wench for your arm does not.... 😉 I'll go first.... I bought a new scoop yesterday, a 36"/914.4mm one to be exact. While normally Doc is my go to source, I was forced to go elsewhere, I wanted black and larger than he sells.... what can I say... all he has are green and blue. In all seriousness, I have a Kubota M62 tractor loader backhoe that I use for doing pushes and digging settling ponds. I have a caliche ripper tooth for it, a 12" trenching bucket which is great for loading the hight banker and a 24" main bucket but I've been digging a settling pond this week and realized how much I needed something a bit larger... so yes, this is gold related... pushes and ponds.... your turn, what was your last purchase. PS: Prior to this, was my Axiom purchase a week or so ago. Link where I purchased it (local Kubota dealer wanted $2,600 for the EXACT same bucket, even with shipping, it was $600.00 less ordering it from the east coast): https://www.ebay.com/itm/144660447847 Pic of the 36"/914.4mm bucket.... whoops, I mean SCOOP, front view: The ones I have already: Loading the high banker: Ripping up calichi:
  16. I looked for this topic before posting so I wouldn’t duplicate something that’s already been discussed. Nothing came up. I remember back in the day, you used to have to send the coil in with the detector when having it repaired so they could also tune it (the coil) to the machine. This was on those with Auto GB. According to Vince Gifford at Tesoro, Manual GB didn’t care because you could manually “tune” it. I was also told that as a result, accessory and aftermarket coils won’t work as well as the original coil that came with it for that reason. Is this still true? Thanks! Walt
  17. Searched around but still can't decide. Leaning coiltek for now. I mostly hunt for coins and small token type targets. Older parks that are slightly over grown and fresh water beaches and streams plus i can hunt some public ground that's huge. It's an old lead mine area that was active from 1830-1930 or so. Wooded/hilly with sink holes everywhere and has to have building sites that are long gone. From what I've read the coiltek is close but not as deep as the 6" M/L coil. But in water i would sure like the added coverage. Another thing i read here is the coiltek middle is not as receptive as the heel and toe. How would that effect swing pattern? Thanks.
  18. Seems like all the recent interest in coils has got Minelab interested in looking at being clever with some coil designs themselves. Nice to see Minelab acknowledge in writing the power of spiral windings too, something some of us have been saying for years is real, now there is no debate. Seems Bruce Candy himself agrees with what some of us have been saying over and over - they work just fine in mild and medium soil too. We already saw the horizontal/vertical spiral winding idea in an unpublished patent, but it's published now. This is for hotter ground. Idea being you get the advantage of a spiral (increased sensitivity) without the disadavantages (spurious signals in highly saturable soils) by turning the front/back ends of the coil vertical to decrease the flux density going into the soil in parts of the coil that aren't required for side to side motion. This one (US 20220221610 A1): There are a number of other winding configurations in the patent as well. I just noticed an International patent that hasn't been filed in the US yet too (WO2022126185A1) with some pretty crazy coil designs. From what I gather these are actually concentric coils. They seem to have up to 2 to 5 "groups" of RX and/or TX windings to null out what I guess is spurious saturation signals, conductive ground, and EMI. But then they seem to just concentrate mainly on saturation. But I'm just taking a break from work and eating, figured I'd look up patents while I sit here, so I don't have time to do more than just selective scrolling through this extensive document. I scrolled past some talk of such coils designed with 2 cables to the control box too. Here are some odd concentric "noise cancelling" coil cross sections from this patent: There are some apparant performance graphs too which I guess relate to depth, but they are unlabeled so I'm not sure what they mean until I have time to read through everything. So I'm not going to post them because I have no clue what they represent right now and I gotta head back to work.
  19. Well, I figured out what that little dimple is on the front end of the 14 inch coil - it makes a perfect nugget holder so they don’t roll off for pictures, and they fit the little dimple perfectly. This thing is really good at finding them, I found patches all over the place, deep ones too!😉 First weekend out with it, And it’s finding birdshot all over the place. At least I’m using it right! I really like this coil and see being on my detector a lot. One thing I figured out with using it, don’t extend it all the way forward, sure makes the front and lighter. It’s also working well with my gear, pick stays in a holder behind me. I could also use my cell phone for mapping while using the detector, Guess that’s what the DD is best at. One other suggestion, I tested it and was able to use an Apple tag on the detector to help track it if it ever gets stolen. I imbedded it in the bottom of the case, and the tag does not seem to interfere with the detector, Even when using the mono coil. Just a thought if you were concerned about somebody “borrowing” it. If you’re worried about it being on the detector during use, another option is just put it in when you store the detector.
  20. Responding to Peter in SA. Back in the mid 1980s I had been involved in the introduction of the Minelab GS15000 metal detector at Wedderburn in central Victoria. The early Minelab crew were a bunch of clever people from Adelaide university who got together to produce an Australian made metal detector which could challenge the big American companies. Wedderburn was chosen for testing and development due to its reputation of having very mineralized, difficult soil conditions. A number of Australian built detectors had failed to live up to expectations, defeated mainly by the hot soil conditions in Western Australia and central Victoria. The GS15000 proved to be a better machine for these conditions than its competitors and soon gained acceptance throughout the gold detecting fraternity. Craig Hughes, who was part of that early team came up with the idea of a coil towed behind an ATV. An area near the famous 'potato patch' just out of Weddurburn was chosen for testing, using a Honda three wheel ATV (horrible unstable beast of a machine). The coil was fairly small, but I can't recall the exact size. A GS15000 provided the electronics, and although noisy, did work with a small bit of gold recovered. (a few grams) Even though the manual ground balance made for uncomfortable detecting, the concept had been proven, much to our surprise. In 1987 I was involved with the testing of the GT16000, which was the first ever automatic ground tracking. This machine was a major breakthrough and really put Minelab on the map as a serious contender for the title of the world's best gold detector. It dawned on me that the feasibility of tow detecting was a reality now that a detector could stay balanced automatically, and I contacted Don McCoy, one of the original Minelab team and asked him to build me a coil suitable for towing. The result was a rectangular coil about 3' x 2' which was very stable and sensitive. I purchased a Yamaha 4 wheel ATV as a tow vehicle and with the addition of a suppressor managed to keep the EMI to a minimum. The first day of testing yielded a 6oz lump, which was a big surprise, and paid for the ATV in one hit. I sent Don some nice specimens as payment for the coil. I later sold that coil through Miners Den in Melbourne when the SD2200 was introduced. The SD2200 was of course the first auto ground tracking pulse induction detector, and naturally I soon made plans to adapt this concept to 'sledding'. John Hider-Smith, Ian Jaques and myself had been involved in prototype testing of Minelabs first pulse induction detector, and Bruce Candy had taught john how to wind mono coils. One of Johns coils was used in the first PI tow coil testing where we discovered that a 4 stroke engine was not feasible due to the high susceptibility of PI to EMI. With experimentation we discovered that diesel was the way to go as no spark was required for the engine to run, and an isolation switch for the alternator solved any EMI problems. We later used a GPX4000 which worked even better. I have to close now due to having to shut down internet but will add further details later.
  21. I have 2 coils on my Tejon. 8x9 conentric I use in high trash areas and parks (same thing) and a 10x12 i use for woods and fields. I got lazy and left the widescan on and hit a local park and came across bottle cap after bottle cap and could not find a good tone break to cut them out without losing too much range. I saved a couple and tucked them in my back yard 6" down and did a quick test. I set my 2nd discrim for break on the widescan and the primary for the concentric and there is a huge jump between them. Both discrim match up on other items such as coins and rings, pull tabs. Note that both coils actually ground balance the same and the widescan can pick up the tiniest pieces of lead and foil. I have found lead pellets from a pellet gun 4-6" down with it. I can also place a cast iron hammer head half over a dime and still hear just the dime though broken signal It's there. So I am really stumped on the bottle caps. Maybe someone here knows why.
  22. I didn't really know where to put this but for Nel coil fans such as myself it looks like they're coming back! I really hope so. They have updated their website with this notice. It's sad what has happened to them but I'm glad it looks like they're going to survive it as a company.
  23. Hi all, I just ordered a NEL Thunder coil for my also new Notka Makro Simplex+. This coil has a straight shape center receiving area. Other coils have a football (American type) shaped receiving area. I can't find any discussion on these two types of constructions. Does anyone know what each shape does? Like specifically, bennifits and differences? I can only speculate as I'm not very knowledgeable on this. I am thinking the NEL Thunder may have even sensing front to rear, and maybe narrower field which may be able to separate slightly better. The football shape coils I am thinking, may have a different field shape and may do something different. All this is speculation. However, it is this Thunder coil that is different than most and I'm curious as to what this coil does in it's detection field. For me, the coil has a lighter weight and larger area than other options. I'm searching dry sand and open park areas. Maybe even waist deep water. This shape and size is ideal for me. And the construction is new to me, just so you know. Thanks! TG
  24. Questions regarding NEL coils for those that might know.----I understand that production of NEL coils has ceased at the NEL plant & service center (because of the war in Ukraine).-----Is the supply of these coils drying up that are in the "pipeline" (at distributors)?----Is the prices on NEL coils expected to increase because of this?-----Any info regarding this would be much appreciated.
  25. VLF detectors can come with DD or concentric coils. This is similar to but not quite the same thing as DD versus mono on a pulse induction detector. There are three basic coil types in wide use, Concentric, Double D (DD) and Mono. A VLF detector transmits and receives simultaneously and so there must be both a transmit coil and a receive coil. A pulse induction (PI) detector can alternate between transmit and receive and so one coil can be employed as both transmit and receive in an alternating fashion. There is confusion on this but simply put VLF (induction balance or continuous wave) detectors do not employ mono coils. A VLF can only employ the concentric or DD options. A pulse induction coil can work with all three types. Metal detector coil types illustrated - concentric vs DD vs mono VLF detectors are more alike than different these days. One thing that can make a real difference is what coil the detector comes with. Two very similar models will be quite different if one comes with a 12" round concentric, and another an 11" x 7" DD. In this case the very same detector can be turned into two different detectors by changing coils. Here are a couple rarely seen on the F75 - the 10" x 5" DD and 10" elliptical concentric. A big difference between the Teknetics T2 and Fisher F75 was that the F75 came later and the ability to use concentric coils was added. The T2 can only use DD coils. Why DD or concentric? DD coils are all the rage these days. However, concentrics have more consistent detection patterns with less dead spots up close. Every notice how that DD coil goes wacky on shallow targets? And concentric coils are much better at identifying flat ferrous targets like bottle caps. Here it is from the guy that should know best, Dave Johnson, lead designer on the F75. About Search Coils by Dave Johnson Search Coil Field Shape by Dave Johnson Coil Basics by Carl Moreland I like the 10" DD for the solid design, better for working in stubble or other locations where an open coil might hang up. The concentric just for being better behaved. The DD is the better prospecting coil for bad ground. Concentrics do well on milder ground. A note on coils. The blade like knife edged detecting pattern depicted in DD marketing ads, and even the diagram above, is largely myth. Electromagnetic fields radiate and simple coils cannot focus them into beams. A round concentric coil has a search field shaped like a soccer ball cut in half. A similar size DD coil will have a search field more like a football cut in half lengthwise. If you ever doubt this, just fire up your detector with a DD coil, flip it over, and run a coin under the coil noting where the signal fades at different locations under the coil. This is best seen via true all metal modes, as disc modes suppress the edge signal to a large degree. But it’s there, and targets under the edge of a DD coil will mask centerline targets to a degree that would surprise most people. Finally, depth is more related to coil width than coil length. Think of a 5" x 10" coil as a stretched out 5" coil, not as a skinny 10" coil. That is why when listing elliptical coil sizes you will often see me putting the small number first. Marketers do it the other way around so you tend to think you are getting more than you are. A truer picture can be had by comparing the total area of a coil, one to the other, but for quick and dirty comparisons, comparing by width will give you a more conservative idea of comparative coil performance, than comparing by length. Fisher F75 with 10" Elliptical DD Coil Fisher F75 with 10" Elliptical Concentric Coil
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