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  1. Today I sold a Whites TDI pro to a customer, we set it up and turned it on with the stock coil and did a few air tests. He heard that Minelab coils would work and other PI series coils. I suggested we try some Detech coils with the following results. The new 14in Mono Spiral wound ran quieter and air tested a little deeper on coins than the stock dual field. The little 6in Detech mono was a surprise as it hard and loud on targets for its size. When the weather gets better we are going to try a variety of the Detech coils and see which are worth having for the TDI, outdoors with more realistic buried targets. I`ll post what we find out.
  2. 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
  3. It's great to see Nel still around, they've survived the odds so far and now they've released their range of coils for the Legend. Legend owners now have an additional 10 coil choices for the detector, and this will mean it's fiercely competitive with the best of the best from any brand. That 17x15" Nel Big would have to add some depth, then the absolute tiny gold nugget (flake) sensitivity of the Nel Snake at 6.5 x 3.5. The Nel Superfly and Tornado are also coils to take note of. It was always my condition that I wouldn't buy a Legend unless it had Nel coils, as I have too many detectors and adding another similar one would be a pointless exercise for my needs. However, now with Nel having their range of Legend coils available it is a must have detector for me, the Legend paired with a Nel Snake coil would be a beast for prospecting. He's a link to the Legend's Snake coil. https://nel-coils.com/index.php/en/production/nel-snake-9-5x3-5?id=2376 I'm sure they're going to be hard to come by at the start, and no doubt expensive as shipping from Ukraine at the moment is sky high, a price I am willing to pay though, this has to be a giant kick in the marbles to Noktas competitors.
  4. I was on a trip, using my Gold Bug Pro device with the standard 11-inch search coil, and suddenly the device continued to buzz with the Overload message appearing. I moved away from the place, but nothing changed. I raised the detector high and nothing changed. I also tried the other 5-inch disk, and it was normal. I expected a nail or Something similar entered through a crack at the base of the search file. I dismantled the damaged file and did not find any indication of the problem... Any help is welcome
  5. I bought somebody's GPX 4500. It came with 4 coils. Then I realized that I don't have a clue what are the strengths and weakness of the different coil configurations. What are some general principals to guide folks in matching coils to the situations that they encounter? I don't recall having seen any guidance on this. Thanks
  6. I was just curious to know if the AlgoForce runs bundled or spiral coils optimally? I know it's early days to know definitively but is it safe to assume that the AlgoForce isn't too fussy in coil configuration. I know there is mention of the older Gold Search coils working well as do the Evo line of coils (Spiral). I guess this leads to whether either of these coil formats would be best in hotter ground? Thanks for any feedback. I only own 3 mono coils that I use with my GP3500.......my all time favourites.
  7. VMI went out today, it was beautiful. Wanted to do a bunch of testing and comparisons on coils and depths between a vlf and pi. ( So i know where the cross over is ). When I got to the stock 11" dd commander for my 4500 it didn't work. I mean I waved it two inches off my pick before it responded! I looked the whole thing over but can't find the reset button. Any words of wisdom? I've included pics top and bottom for reference. And fat fingered the pics, sorry. I think I'm going to ever so carefully take it apart with a two pound hammer and see if I can find the problem. On the other hand I can now fully justify a new aftermarket.🤠
  8. Looking into purchasing an aftermarket coil, equivalent to White's DD eclipse for an MXT specifically. I really don't know whats out there from other manuf. Looking for a HOT (sensitivity/depth) coil. Better target separation is a plus too. Or would you recommend I stay with whites coil? Any experience and feedback would help. Thanks, TC-AZ
  9. 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!
  10. I keep reading in a few different post (To Not Turn A PI On Without a coil connected) I have not attempted to do so because of reading what I quoted, but have often been curious as to what would happen if one was to turn a PI on without a coil connected I know with a VLF generally you will get a coil Error pop up and for instance like the Legend the Legend will shut itself down with out a coil attached so can someone explain to me what happens if you power up a PI with out a coil attached (Just Curious) also why do manufactures not put in a fail safe to prevent a PI from powering up with out a coil connected, if it can cause harm to a PI again just curios because of a statement in one of @Steve Herschbach recent post
  11. I have an Axiom and a good old AT-Gold for hunting in water. I've been trying to find out why Garrett favors blunt ends on it's coils. I've found one brief reference in a forum that the design provides more depth on the front and back end of the coil. I've also seen a reference that stated that the rounded corners may be the hottest part of the edge. They seem to use this design for both DD and Mono coils across all of their products. Can anyone talk about the good and bad aspects of the blunt end design? Why is the round coil design better or worse?
  12. Anyone know what types of plastics all the manufacturers use? I am looking at printing some skid plates and coil bodies if I'm able to get some time to experiment with making my own coils next season if this Algoforce rolls around and we have use for non-chipped coils again. I can 3d print strong plastics like polycarbonate and nylon, leaning towards one of those. But I'm just curious, is there an industry standard for the types of plastics used for the injection molded coils? I feel like maybe nylon, but I'm unsure. I like the idea of transluscent polycarbonate coils so I might try that first (inspiration from Strick's x ray posts). Seems like the cheaper spools like PLA, PETG, even ABS all might be kinda too weak. I know layer adhesion makes 3d printing non ideal for wear parts, but the ability to quickly print and prototype different geometries seems compelling for experimenting. Anyone know what like NF uses for example with the modern coils like Evos? Anyone printed a coil yet and determined how robust (or weak) it is compared to injection molded of same plastic?
  13. Has anyone ever used both or at least the Detech and have any comments at all? I'm confident enough in the Commander but wonder if the Detech might be a better option. Basically going to use for looking for coins and better yet rings at the beach so don't care about hitting tiny bits, in fact prefer not doing that. Detech has the spec edge at 780 grams versus Commander at 820 grams. Detech is rated waterproof whereas Commander is only rainproof. Commander coils I am pretty sure are Litz wire. Not sure about the Detech.
  14. Looks like M15's are hitting retail at the moment, a guy in NZ has secured one, not me unfortunately, I may have been to slow to order by the looks of it but at the early stages I wasn't even sure I was going to bother with my Manticore, now I've decided I'll give it a chance. Hopefully my spots not too far away. I've ordered both coils.
  15. So I read all the old reviews on here for the GPX17 coil for the 6000. Is everyone still in love with this coil like the old reviews indicate? The 6000 is my primary gold detector and I dont have a 7000 or 5000, and I also know the 6000 will never match these machines regarding depth on larger gold. Is the GPX17 still a good coil to have for patch hunting in open ground and some extra depth compared to the stock 11 inch or the NF 12x7? I was patiently waiting for the NF 16x10 mono coil to be released but it does not appear like this is going to happen any time soon and maybe never. Please advise if the GPX17 is a worthwhile investment now or should I wait for another year to see if the NF coil will be released. I have not seen any field test results comparing the GPX17 to the NF 16x10 even though it appears that JP and maybe others have tested it. Please advise, Ceril
  16. 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!
  17. For those folks who have used both the 9” round HF coil and 5” x 9” elliptical HF coil, if you could have only one, which would it be and why? Thanks in advance for any responses. 22.5cm (9”) Round DD coil: 13 to 15.7kHz, 26 to 31kHz, 50 to 59kHz 24 x 13cm Elliptical DD coil: 13 to 15.7kHz, 26 to 31kHz, 68 to 81kHz
  18. Anyone know about the M8 & M15 Coils price and availability date? They have been up on the Minelab site for a couple of weeks but no one is advertising them yet.
  19. Anyone know of any person or company, worldwide that sells coil shells? Thinking about building a smallish CC coil for the Legacy Minelab PI's. I only know of a Bulgarian and Ukrainian seller but neither has coil covers to accompany their shells. The Ukrainian one (Pictured) is only a 9", so the receive coil will be C.5" at best.....so should be sensitive but not great overall depth for larger targets. Any ideas????
  20. I tried to finalize the purchase of a Troy Shadow X5 coil and it seems that the only way to pay is by making a deposit into a bank account, money order & money gram, which is strange or suspicious for any company that considers itself serious. Note: The same coil is on an auction website for twice the price.
  21. Something I've been wanting to do for a while now..I got another x ray generator couple weeks ago and wanted to try it out on my DR System.. Heres most but not all of the coils I have. 1. CTX 6" 2. TDI Pro 12" double mono 3. CTX 17' 4. XP Deus 9" 5. Miner John 8x12" mono 6. x cal 8" 7. Gold Monster 6" 8. Fisher Gold Bug two 6" 9. Nox 6" 10. Nox 11" 11-14 GPZ 7000 stock coil
  22. Just curious if any of you folks still use a concentric coil and if you do, when and why versus a DD. I picked up a Tesoro Sidewinder with the 8" concentric coil a short while back and did some parking hunting with it last week. It did remarkably well. Yes, I did dig more trash than I would with my Legend or Equinox 800, but the Tesoro did reward me with a good pocket full of clad and a shallow wheatie. I had forgotten how easy it was to pinpoint with a concentric coil. And the detector was really fun to use. No updates to install, no menus to trudge through. Don't know if I will use it a lot but it was a nice change of pace. Bill
  23. I need some help in Choosing which big Mono Coil to purchase for the Axiom I currently have the 13x11 DD and the 11x7 Mono which were in the package I purchased, I also picked up the 11x7 DD I am wanting to add one of the big Mono's for the Axiom, but can not decide if I want the 13x11 mono or the 16x14 Mono Someone please sway me one way or the other LOL How much depth will I gain with the 16x14 Mono over the 13x11 Mono if any, I know this depends on several things ??? how much sensitivity to smaller gold will I loose with the 16x14 Mono or the 13x11 Mono if any ???, I also know there is to many factors to consider on this one also price is only like $20-$30 more between the two so not an issue in my opinion So there is my dilemma, so again give me some reasons to choose the 13x11 mono or the 16x14 mono for me it keeps coming down to (if I am going to go big go the biggest I can currently purchase) LOL Thanks for reading my RANT
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