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  1. Perhaps of interest, a place to collect info of detectors from our past and their modifications. There were a few homegrown detectors about in the 80`s in OZ, their manufacturers no longer operating, perhaps also were others throughout the world, these were "the building blocks" of the sophisticated machines we use now. Some like the Goldseekers 12000 which lead to ML, and another that enjoyed some popularity was the Bridgewright. This photo is of a Bounty Hunter RB10 that has a added pot on the front near coil plug, I believe this modification may have come from not yet ML technicians back around 83-84, unfortunately I`ve lost the operator instructions which had a extra page explaining the use of this pot in GBing the detector.
  2. My brother knows I'm trying to build my own machine and sent me this diagram. Thought it was pretty funny 🙂
  3. An add for the lack of experience, wisdom, or judgement prospector. MWF Gold Radar Long Range Metal Detector - Professional Gold Finder and Deep Seeking Geolocation Tracker - Premium Treasure Hunting by MWF Metal Detectors EXPLORE ANYWHERE: High end professional metal detector that gives you the power to search over multiple terrains. Using superior geolocation technology detect far more then before with the dual functions deep seeking and long-range target locating. GOLD FINDER: Unmatched in gold hunting capability! This detector is designed to accurately locate everything made of gold, like coins & jewelry to older relics and larger treasures. The ability of the Long Range Gold Line is 50 meters deep and 100 meters distance. IONIAN AND RADAR DETECTION SYSTEM: High quality and accurate performance, product manufacturing with the best electronic components and circuits up to international standards. works on a built radar detection system, to detecting and searching for radioactive ionization of the gold buried underground. MANUFACTURER WARRANTY: Guaranteed manufacturer’s warranty on all products. Detector Power is also proud to offer a hassle-free 15-day return policy. NOTICE - Bank authorization may be necessary prior to purchase to prevent order cancellation. Please confirm with bank prior to purchase to avoid order delays. New (1) from $6,999.00 Professional Gold Finders only 🤩.
  4. Hi all If I'm using a vlf/lf that is over 40khz, is there any benefit to getting a 2nd machine that runs under 40 kHz when prospecting? Assume PI is not possible at the moment. Does a sub 40 bring anything special to the table? I'm a beginner so just curious Thanks
  5. I was reading the Australian Electronic Gold Prospecting Forum today and noticed a post about detector depth. I was wondering what others think about today's detectors compared to what was available 25 years ago. I read somewhere that (Woody) the guy that does mods to detectors thinks that for outright depth the sd2000 still goes the deepest. I wouldn't know as I've never owned a sd2000 or a gpz7000. Anyway, i found the comments at AEGPF interesting and wonder if anyone here has actually done a depth comparison between the zed and sd2000. Heres the snippet from AEGPF Quote from AEGPF: "The deepest Pi detector ever developed in my opinion was a prototype SD2000 that BC modified for the late Jim Stewart.BC slowed down the clock speed to give a very long pulse and made some other unknown changes to the circuit to cope with higher currents etc. At the time the SD2000 came out BC stated that it was at about 95% of the maximum potential depth that any handheld PI could ever achieve (and still pass emission standards). However, the deepest PI that has ever been made for gold was Corybns detector which detected a nugget of around 10oz? at 3 feet in depth in WA. Somewhere on the forum is a reference to it and I will try and find the link when I have time. "What is interesting is that the deepest nuggets ever detected by a Pi was by a detector used in the early 1980's in WA-Corbyn's wheeled detector! Pictures of it and the depths of some of nuggets he found with it can be seen in Mike Wattones book: Quest for gold.NO Pi detector today could match the depths Corby got on at least one nugget! (4cm nugget at over 36" in mineralized ground)"
  6. Not sure this is a topic for this forum, but this is where I see a large number of technically adept folks posting so I'm going to try (also the folks who are talking about x-coils on another forum). Has anyone had detecting experience around these 5G installations being rushed out everywhere across the world? It will be interesting to see what levels of interference are generated by this emerging technology. I personally am very much against it's roll-out because there are no deep studies that portray it as a safe-for-living-things technology, in fact the opposite seems to be true, but that aspect is probably not a topic for this website.
  7. Hello everyone .. I wonder if there anyone who uses a 3D metal detector to locate gold deposits @ around 15 to 20 feet deep... I have heard of larger nuggets of 1 and 2 pounds in size and gold deposits with 300 grams in a bucket of dirt being found in the river banks. Could a GPX with the New 30" coil could reach a 1 or. 2 pound nugget @ 4 feet deep... Im not interested in the finer gold just the bigger nuggets or a large concentrate of gold ..
  8. I welcome! Minelab is a hybrid MDS-10 Minelab multi-frequency metal detector and Ultra WideBand pulse radar from Chemring. In the summer of 2019, the Minelab MDS-10 project (version 2.0) was adapted to search for historical finds. For what I bought, for what I sell. Target sizes include coins and jewelry. Practical tests confirmed the effectiveness of the technology. In Russia expected that the novelty will be presented at the copy slate Detectival 2019. But alas... Does anyone know when? IMHO Minelab should enter the market of such devices.It is impossible to give the market all the time to LORENZ, MAKRO Detectors, Nokta, with ichony georadars. With respect.
  9. I would like to see what any of you have created as far as displaying your metal detectors at home. I'm looking for creative ideas to make a home display myself. I'm entertaining many ideas from open to closed displays, even using Curio cabinets. To be clear, I'm looking for ways to display machines primarily, which could be mixed with finds as well.
  10. Occasionally I've read that an eddy current (set up by a metal detector's transmitted signal and which generates a magnetic field to be 'received' by the detector's circuitry) in detected objects are confined to that object's surface. If true this can be relevant for materials of mixed metals (no, I don't mean alloys) such as some coins and some crown caps, as well as plated objects like cheap jewelry. There is a simple exposition common to US coin hunting which disproves this contention. The US 5-cent piece ('nickel'), with the exception of 4 years during WWII, is an alloy of 75% copper (Cu) and 25% nickel (Ni). Modern US clad dimes and quarters (and some other denominations, all minted after 1964) are a sandwich composed of a pure copper layer in the middle 2/3 of the coin and two surface layers (each 1/6 of the coin's thickness) composed of the same Cu-Ni alloy as the 5-cent piece. The US nickel's numerical target identification (TID) on every(?) metal detector is considerably lower than a clad dime. Example 1: MInelab Equinox -- nickel hits 12-13 and clad dime 25-26, typically. Example 2: Fisher F75 -- nickel approximate TID = 30. Clad dime approximate TID = 70. Yet a US dime is smaller in both diameter and thickness than a US nickel. If only the Cu-Ni (outer) layers of the dime contained the eddy currents then the TID of a clad dime should be lower than that of the nickel, not higher. Conclusion: at least some of the eddy currents are in the copper core of US clad coinage and thus we can generalize that eddy currents aren't simply confined to the surface of metallic objects.
  11. I started this project 2 or 3 years ago (so long I can't remember). Spurred on by recent field experiences and also a recent thread on Equinox settings I've finally finished it. I don't know if it's a completely new idea. I call it a 'test-stand' as opposed to 'test garden' just to distinguish it from the standard test gardens many of you either already have or at least are familiar with. There are other similar variable depth test gardens out there (seen on YouTube). This one has the advantage of continuous depth capability. It also allows 3-d target orientation angle (similar to pitch, roll, yaw of airplane). It's based upon the 30-60-90 triangle (remember that from geometry/trigonometry class in high school?): Here is a sketch which shows how to implement this concept: Shown in the sketch, buried at an angle, is a PVC pipe. A test target can be slid into the pipe a distance 2*d which will result in it being located at depth d. I used two sections of pipe (ID = 1.57 in., OD = 1.90 in.), side-by-side to allow me to put neighboring targets in the ground with some option of how close the two targets are separated. Think of this as burying a double barrel (side-by-side) shotgun with the stock end deep in the ground. All you see are the ends of the two barrels. The concrete (bag of Kwicrete) locks the pipes in place. Here's a closeup of those extruding barrels: Besides the tape measure (units of inches) you also see a hand-graded scale at left which I'll explain shortly. Here is an overall view: The two PVC caps, attached together, are for keeping water, dirt, and varmints out of the pipes when not in use. You'll notice a 1.5 in. diameter wooden dowel rod inserted into one of the pipes. More detail on that shortly, but the target is inserted into the dowel near its end and then the dowel is slid into the pipe. Holes for locating pins (you can see one of those -- gray plastic -- inserted to register the intended depth) are 1 inch apart leading to a depth resolution of 1/2 inch. (Again, refer to the 30-60-90 diagram to understand the relationship between insertion length and actual depth into the ground -- a 2::1 ratio.) Next I show the business end of the dowel rod: The black foam fills the chamber and holds the target (in this case a silver dime) in place. The hole in the dowel is actually lined with a plastic film canister (remember those from 35 mm film days?) which has been modified to conform to the circular cross-section of the dowel and thus be able to fit into the pipe. The second slightly smaller) large hole was put in there originally for a second target but so far I haven't used it -- likely of limited value. You can see the registration holes. The first one has a red '2' (difficult to see) just above it; the next (representing 2.5" depth) isn't labeled; the third one has a '3'; etc. These represent the resultant depth of the target when a registration pin is put in that hole and then the rod slid into the pipe until the registration pin keeps the dowel from going deeper. Although the chamber packing material can be made up of many materials, I chose ethafoam (polyethylene foam) high quality packing material. You typically find this in higher end electronics packaging such as with desktop computers. More commonly it is white but in this case I used black. I initially cut plugs with hole saw (see next photo) and then trim with a pocket knife as needed to fit the pipe: Ok, so now you're still wondering what that specially graded (homemade 'yardstick') is for. Again, referring back to the 30-60-90 triangle drawing, the 3rd side of the triangle is also related to the depth. It is squareroot of 3 times the depth. (Squareroot of 3 = 1.73.) That yardstick will indicate how far downrange (along the ground surface) that the target is located. This helps when you get an iffy response on your detector and want to confirm or deny that the surface location of the target is consistent with its depth. The units written on the scale are associated with the depth of the target. You can see from the sketch above that the max depth is 15". The largest common US coin that will fit the chamber (with some force...) is a half dollar. I didn't keep track of the cost but it's probably $30 or so, mostly for the PVC pipe and caps and the dowel rods plus a bag of Sacrete. (I'm counting labor as free. 😁) OK, now that I (finally!) finished this test-stand it's time to get busy making measurements. I'll be posting those here on the forum as they become available.
  12. Hi Guys, How many detector brands have Mixed Mode. Thanks in advance.
  13. If what we see of the face of the Vanquish is true with eighteen notch points then it’s bundled. This happens in lower end detectors but not totally true being it came in higher cost detector too My Sport wasn’t cheap but it too has the problem of having notch bundle . I have the ORX and to cut out anything I start at the bottom and work my way up . Like others I can’t pick what I want delete what I don’t want. The only one that we all know that will let you notch out what you don’t want and leave the others is the Nox . This is the main reason I don’t like my Sport is because of that. Don’t get me wrong I’d like it to run in more than one frequency but I knew that ahead of my purchase. I guess you couldn’t make me happy if you would hang me with a new rope. Just thinking out loud again! So why don’t you do the same here. Chuck
  14. These discontinued Minelab products are really cool to look at and read about. I was amazed. The Golden Hawk looked cool! Wonder what the Klondike looked like. https://www.minelab.com/usa/support/knowledge-base/discontinued-products
  15. Check this beauty out. Five km range and depths of up to 75 meters. And only $2500!
  16. Anyone remember the old Popular Science ads? I thought this was a good classic to share. Even though this ad pre-dates me by 6yrs, it puts a smile to my face :)
  17. I’m not so sure if I really have a opinion but maybe each here may . So please let me hear from you on this subject. Thanks! Chuck
  18. Just thought... it would be interesting if the technology ever came about where you could run one detector as either a VLF or a PI (orZVT). What machines would you combine? I would go GPZ and Equinox
  19. Yeah well as in inherently curious person, I was wondering when someone will design a smart phone app that makes your smart phone into a virtual metal detector. Might use a coil like the X35 on a carbon fiber shaft bluetooth connected or USB "c" connected. My Galaxy S10 + certainly has more than the processing power and ram required to do the job. Bluetooth headphone capable, gps, you name it. Just thinking again Johnny
  20. Try a standard Bic plastic ball point pen medium tip - small brass tip with 1mm tungsten carbide ball. Steve Herschbach has used it for years as a standard for testing gold detectors - also easy to stick in the sand and hard to lose. - and, of course available everywhere.Google Steve Herschbach bic pen and read what he has to say about it. It apparently behaves a very low conductive target. It presents in interesting test of the cut-off setting of a detector with iron discrimination - Might ve interesting for MantaHere’s the results one guy got with his nugget detector on various targets (the POINT - lol - is to show how tough a target the pen tip is....)”Bic Pen-3/4" 1/2 Grain (not gram) nugget 1" 1.3 gram nugget 5" . One tenth oz gold coin 8 1/2".. from Finds Technology Forum When I saw this posted the first time I tested some ball point pens from motels I had stayed at. Didn't have a Bic. Pen A(3.5us time constant) pen B(2.2us time constant) pen C(.65us time constant). Saw reply again the other day. Found Dollar General had 10 BiC Round Stic medium pens for a dollar, 1mm tungsten carbide ball. BiC(2.1us time constant). Charts a little less than a 4grain nugget I have. Wondering why test above has BiC pen closer to 1/2grain nugget than a 4grain nugget. Maybe missing I'm something. Thought I would go to the source to ask. The time constant of ball point pens can vary a lot, wondering if the one I used is the same as used in the test above. Does look like a BiC Round Stic medium tip would make a good test target.
  21. We've spent a lot of time here lately on whether to X or whether to CoilTek. We don't know if we should Z or Q. We have so many choices we don't know what to do. Make life simple and get the app: This might be easier. Forget the coils and forget the manufacturer. ? https://play.google.com/store/apps/details?id=com.gamma.metaldetector&hl=en_US
  22. The black stone is pure magnetite. The purpose of this prototype is discrimination that can indicates very deep targets such as for digging . So far all very deep targets were missed , as well as non-magnetic targets are indicated by discrimination like magnetic (iron ) . The prototype was tested on sand of pure magnetite and can be used to search for golden nuggets , while at the same time rejects the shallow iron objects . In tests on different soils shows very low soil noises , and almost complete absence of false signals . There is a video with the same prototype in youtube , from October 2018 .
  23. I’ve been hunting a good site using the Deus and Equinox which has nails and small iron mixed in with good targets, some good targets being deep, but near or in the iron. My question is, will a GPX with Iron Discrimination turned up and the smallest DD coil pull out the deeper, non-ferrous items amongst heavy iron? Has anyone had any experience with this? I think for shallow targets the Equinox or Deus works better for shallow targets in this “machine gun iron”, but would like to see what others may have insight on for using the GPX. I’m assuming the fast setting and special soil timing may need to be adjusted as well. Thank you in advance.
  24. Good evening, I’m venturing into the spotlight here with my first post to ask what likely amounts to a novice’s question. It stems from an experience I had about a year ago with finding my largest nugget. The location was in a small creek bed, which had been conveniently cleared of cobbles and overburden down to a small patch of bedrock surrounded by smooth, silty clay by a dredger. Using a GM 1000, I had detected out several small nuggets from within the bedrock cracks that had been exposed, but not properly crevassed by the prior prospector. However, the thick clay surrounding the exposed bedrock had pockets of varying degrees of moisture. This was providing me a bit of challenge since the wetter spots seemed to be behaving just like hot spots. After an extended wrestling match with the wetter signals and the available settings, I gave up. However, by the time the next weekend came around, I just couldn’t get those wet spots out of my mind. With the heat of the summer and record drought conditions, I guessed those spots may have dried just enough to deserve one final pass. Within minutes of returning, I had found a solid, repeatable, 2 bar non-ferrous signal in the deepest clay pocket on the upstream side of the rock. (This exact spot had seemed masked the week before.) Digging 4-5 inches down into the smooth clay I found a “rock” that made my detector sing. Cleaning it off revealed a beautiful 1/3 ozt. nugget. Call it beginner’s luck—because I do. Now for my question. Were those wet spots of clay giving me fits because of greater relative mineralization, heterogeneity of moisture, or VLF technology? Perhaps it was some of each? Part of my curiosity stems from never having used a PI detector. For those of you with plenty of PI experience, do you also struggle with wet spots or mud spots for lack of a better term? And, if so, are certain PI detectors more resistant to the struggle? Thanks for any input you might spare.
  25. I believe there is not much more they can squeeze out of VLF technology, even multiple frequency has it's limits and is really only 2 frequencies. Are manufactures better off concentrating on coil design rather than just tweaking an existing design adding a letter or two to the name? After market coils quite often improve a detectors performance, so shouldn't manufactures be looking in this area rather than using the same coil designed years ago? Would like your thoughts
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