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  1. 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.
  2. Hi Guys, How many detector brands have Mixed Mode. Thanks in advance.
  3. 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
  4. 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
  5. Check this beauty out. Five km range and depths of up to 75 meters. And only $2500!
  6. 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 :)
  7. 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
  8. 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
  9. 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
  10. 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.
  11. 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
  12. 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 .
  13. 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.
  14. 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.
  15. 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
  16. Would love to get your opinions and feedback on this machine coming to market supposedly soon, and supposedly uses a BT connection from your phone or smart device to control the coil. Similar to Deus, but using a phone or iPod touch etc. as the controller. Believe it's single frequency. Here's a video demo. I've long liked the idea of a setup like this but I thought there were good reasons the major players have not created a machine utilizing a phone or iPod touch this way, so I'm skeptical.
  17. I myself like the looks of screen of my MX Sport but not the weight. It would be great for it to trim some fat off of it. Out of all the ID numbers it has to offer I’d like to be able to notch out one at a time. We all know that different frequencies is better than others depending on what you’re detecting. If I can I’d like it to be multi frequency where I can run in all and single one if I do wish. What I want is a detector that it will do the major part of my detecting. My thing I’m a coin hunter first be it on a beach are around some old homestead . I’ve never been a relic hunter but it would have to offer the same for that person too . I love nugget hunting but it’s just not a lot of gold in Texas but it would be great to have some high frequencies to nugget hunt. I don’t see the need that I should have to buy another detector for what little I do get to nugget hunt. We all different and our wants runs different too.I know too it’s other detectors offer the things I’m wanting from White’s right now but I’d like to see America made on the side. Chuck
  18. I've seen debate about this question over and over. Thanks to Minelab's vague description of their use of Multi-IQ on both machines. I measured both the 800 and the 600 (my backup machine) and can put this to rest. They both output identical spectrums.
  19. I hooked up a sensor coil to pick up the transmit frequencies from my 800. Connected to an audio spectrum analyzer I could see what was being transmitted in all the modes. Surprise, Park 1 uses only a single frequency ~ 15KHz. The amplitudes shown are relative.
  20. Just finished a second day hunting with the new Mirage PI. Short days, I seldom go for more than 2-3 hours, but enough to start learning a new to me machine. Something I notice and wonder about. The 9.5" mono coil appears more sensitive to iron near the edge of the coil, while nonferrous seems to hit harder near the center of the coil. Could that be a thing or am I deluded? If it is a real thing, is it a reliable way to make dig decisions? I could swear I read something somewhere about this, but am no longer sure because I am deluded in general anyway. Anyone got thoughts?
  21. i have my dual field that the pots were starting to act up a while ago and decided to get new pots etc so after removing the board to remove the pots i had to remove all connections etc so im not 100% on were they connect now on the board along with the speaker ,coil etc, if any one is able to help i really appreciate it . cheers
  22. How does IB detectors compare to VLF and PI's? Worth trying to build one or just a waste of time?
  23. The whole depth with single frequency VLF detectors thing in my opinion has been nothing but a red herring for decades. I have read a thousand posts from people wanting VLF detectors with "more depth". Yet VLF detectors maxed out for usable depth by at least 1990 if not before. I have not used any single frequency VLF metal detector since 1990 that got more depth on coins than my old Compass Gold Scanner Pro. The only real improvement we have seen and are still seeing is in the ability to find and correctly identify items that are masked by the ground itself or adjacent undesirable targets. There are an amazing number of targets in the ground at depths achievable by any decent detector made in the last 25 years, but that are being missed because they are improperly identified and ignored, or just completely masked and invisible. This is an area where the Minelab BBS and FBS detectors have excelled. They do not go deeper. They simply get more accurate discrimination at depths exceeding what most detectors achieve. Machines like the DEUS and a lot of other Euro machines are excelling not for the depth they get, but this ability to acquire and accurately identify targets at shallower depths that are missed by other detectors. If we had a detector that could simply see through everything and accurately identify coins to 10" the ground would light up with countless missed finds. I get a chuckle out of all the deep coins I see people talk about on the forums when the best detectors made can't accurately identify a dime past 5-6 inches in my soil. Anything deeper just gets called ferrous. There is huge room for improvement in metal detectors still not by getting more depth, but by simply finding shallower targets that have been missed by other detectors made up until now. How To Make Yourself Crazy! U.S. Versus Euro Style Detectors
  24. Published on Jan 19, 2019 - Just a quick video showing the benefits of the Vista Gold running at a higher kHz and using zero gain in highly mineralised soil Here are the videos, after further testing I can confirm that the 15 kHz hits stronger on deep silver in clean Non Mineralised Soil and both are exactly the same on the gold coin at depth in Non Mineralised Soil.
  25. Deep in the depths of winter here, I found myself partaking in some serious speculating. With all the controversy of whether or not the Equinox is multi frequency or not, I figure I'd bring some wood to keep warm lol. Some of you may recall in one of those threads I was trying to explain that the waveform we see can actually be comprised of more then one, two, three or more frequencies. Additionally I pondered if the multi frequency processing could just be done on the receive side using typical sinusoidal waves that are actually doing the work. Nonetheless here is the transmit side, the side that actually excites the target. Below you will see a FFT (Fast Fourier Transform) of the Equinox in Gold2. The scale goes from DC to 125 kHz. (Left to right) If you consider the advertised range of Multi-IQ frequencies as being 5 kHz to 40 kHz, you might be satisfied by this as the left half of this 125kHz graph is filled out nicely. There is even a couple little peaks up around 100 kHz, whether or not that is utilized I don't know. I'm way off base as to how MIneslab actually does this, but I just wanted to show the kind of information that can be extracted from these signals. I am not trying to prove anything specific other then to say I don't think Minelab is being misleading IMO. Assume something is a little off with my measuring, still that looks like multi-something. The approximate frequency peaks of interest measured from left to right are: -2.5 kHz -8 kHz -13 kHz -18 kHz -23.5 kHz -28.5 kHz -33.5 kHz -39 kHz -44 kHz -50 kHz -54 kHz -59.5 kHz That covers the advertised range of frequencies which exist on the left hand side of the graph, (Midpoint is 62.5 kHz) I wont bother with the higher frequency stuff as it may not be relevant. It doesn't really hit any of the single frequencies, on the other hand Minelab does not explicitly say what frequencies are used in Multi-IQ. (That I know of.) I am happy to see that low frequency response. I was thinking the Equinox was going to be all 8 kHz and higher, which it basically is, but I'm glad to see the 2.5 kHz peak right beside it and of almost equal strength.
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