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  1. Meet The Metal Detectives - Inside Engineering at Minelab Electronics A new video showing Minelabs new engineering facility and meeting some of the people that work there. Check out the blurred portions obscuring secret product developments! Amazing engineering staff at Minelab - I consider myself fortunate to have communicated with and even met a few of the people that work there. A few more details about the making of the video at Minelab's Treasure Talk Blog
  2. My recent experiences with new model metal detectors has convinced me of two things. First, I want every new model I might consider going forward to have built in wireless headphone capability. It eliminates the issues surrounding where to place a headphone connection on the metal detector itself, and also eliminates the possibility of a cord failure. Stress on the cord and eventual breakage is the number one reason headphones fail. Headphones, if included or optional, would be best if they had the ability to go wireless or use an optional cord, in case the headphone battery gives out in the middle of a hunt. Second, high end new models should have an ability to have the firmware updated at home by the owner. It has become nearly normal for there to be firmware updates, even multiple updates, in the first year after a new detector is released. I am not talking about getting new features for free, although that would be nice. I am talking about it becoming apparent that a bug exists or something was overlooked, requiring an update to the firmware. Nobody should have to go through time and expense to have to return a metal detector to the factory to get a firmware bug fix. There are just too many new detectors becoming available these days, and I decided I need to draw a line on certain features to help eliminate the majority that are just variations on what we already have. Right now the market is flooded with 13 - 19 kHz single frequency detectors and more arriving every month it seems. Yet models with built in wireless headphone capability are almost non-existent. Given that basic single frequency VLF tech is maxed out, it only stands to reason that manufacturers need to be looking hard at ergonomics and extra features like wireless capability to differentiate themselves from everyone else. It is after all the 21st century. Maybe I can't get my flying car yet, but asking for these two features in new detectors is not asking too much. My current core units: Garrett ATX - N/A Makro Gold Racer - Includes wireless headphone capability as an option Minelab CTX 3030 - Includes both wireless headphone and firmware update capability Minelab GPZ 7000 - Includes both wireless headphone and firmware update capability White's DFX - N/A XP Deus - Includes both wireless headphone and firmware update capability
  3. First, I want to say this is one of the best forums I have ever seen. Steve has put together a GREAT website. The knowledge base on the forum is just phenomenal. I have learned so so much more about metal detectors from all of you. So let me explain assumed. I assumed: White's and Garret were the best metal detectors. Carl Moreland was still working for White's Metal detectors were 10 years behind technology of today. (just my thought) After making the assumptions, I realized how wrong I was thanks to this forum. I realized White' and Garrett have been a sleep. Carl Moreland either quit or was fired. White's and Garrett detector are whats 10 behind. When I got back into metal detecting last year. I was looking for a new machine. I looked at White's and Garrett with the assumptions. I thought about building my own detector. So I read Carl Moreland's book. (Great book) I realized that it would take me 2 to 5 years to develop my own detector. So I scrapped this idea. I could not understand why White's or Garrett had not built a detector with what I expected. I thought that with today's technology there should be a sweep frequency oscillator for the coil-s and an easy to read display. That being said, White's closest model was the V3i. Garrett had nothing. I quickly realized that I needed to look at everything. Because of the forum, I found Minelab was being discussed. When I found the Minelad Safari, I quickly realized it had what I was thinking of building. I don't like their LCD display. It does not look clear a crisp to me. However the machine looks promising. Then I looked at the E-track and CTX-3030. These also look to be very promising machines. Just the price is higher that I want to pay for a -2 times a month hobby. I really wish the best for White's and Garrett. They have their work cut out for them. I want to thank John, Chuck, Tom and Terry and many others I do not know their names for the knowledge your provided and a special thank you to Steve H for his superior knowledge and the wonderful website he has provided.
  4. I do wonder what is up at White's Electronics. They have not put out a new detector platform since the V3i in 2009. Just rehashes of the MXT mostly. Yet they have been extremely busy on the research front, with the patent issued on half sine technology earlier this year http://www.detectorprospector.com/forum/topic/118-half-sine-metal-detector-technology-hybrid-induction-balance-pulse-induction-metal-detector/ And now a new patent for a constant current metal detector: http://www.google.com/patents/US8878515 United States Patent 8,878,515 Earle November 4, 2014 Inventors: Earle; John L. (Sweet Home, OR) Assignee: White's Electronics, Inc. (Sweet Home, OR) Family ID: 51798186 Appl. No.: 13/235,916 Filed: September 19, 2011 SUMMARY OF THE INVENTION The new invention provides better target object characterization and identification while eliminating ground mineralization detection. A constant current in the energizing coil establishes a constant magnetic field that goes from zero to a strong, but constant, field very rapidly, as in less than 10 microseconds. Target objects such as coins and other eddy current objects have an energizing time constant usually exceeding 10 microseconds, wherein the eddy currents accelerate until field equilibrium is reached in the target object. A constant current or constant magnetic field does not produce a significant signal in a receive coil after the transition from zero to constant current from ground mineralization permeability (powdered iron or ferrite equivalent). Target object eddy currents do produce a signal of varying amplitude throughout the constant current period, depending upon eddy current charging time or inductance of the object, usually not a simple exponential due to configuration of the target object. i.e., diameter, thickness, conductivity, etc. It will be interesting to see if these patents result in any actual product. People often make the mistake of thinking a patent means something is ready to hit the shelves and the truth is just the opposite. Patents are often filed and nothing ever comes of it. Or it gets licensed to others, who actually produce the goods. Who knows what is going on in this case, but White's is obviously still attempting to move the technology forward. I hope the best for them as they are an old name in the business and a great bunch of people. What makes this doubly interesting is Minelab also has patents in the works on constant current technology. http://www.detectorprospector.com/forum/topic/311-minelab-bruce-candy-new-patent/?p=2291 The Minelab work is an application for patent that has been in progress since 2009. This White's deal is an actual patent granted. Is there conflict here? Obviously with these two big names at work on the same thing something is up. Sad story is I am not well versed enough in the technology end of things to truly understand how this may actually improve metal detectors for the end user. Other than what it says up above - better discrimination while eliminating the ground. How much better is better?
  5. What we are discussing is usually called "Recovery Speed" by most manufacturers. From the White's XLT User Manual: "Recovery Speed - Speeds target responses, so several targets that are close together can each respond. When a metal is detected, it takes a fraction of a second for the detector to process the signal before it can respond to another metal target nearby. The time it takes to process the first metal target signal so that the second metal target signal can respond is called RECOVERY SPEED. There are advantages and disadvantages to fast (high numbers) and slow (low numbers) RECOVERY SPEEDS. Faster RECOVERY SPEEDs work well in high trash areas. However, they will have some difficulties with very deep targets as well as double responses on shallow targets. Slower RECOVERY SPEEDs do not work very well in high trash areas. However, they will have better responses on very deep targets. Slower speeds also have more definitive discrimination sounds. A custom setting needs to be found that suits the preferences of the individual and the conditions in the area. As a general rule, the closer together the metal targets are in an area, the faster the recovery speed should be. The more spacing between targets, the slower the speed should be. Don't use the fast speed if you don't need to. In very trashy areas it is recommended to switch to a loop smaller in size than the standard 9.5 inch black loop. Smaller loops offer better separation between targets. However, larger loops detect deeper and cover more area with each pass. RECOVERY SPEED combined with a smaller loop can be used to search severely trashy areas." Just to confuse people White's decided to call it "Recovery Delay" on the V3i. A low recovery delay equates to a fast recovery speed. From the White's V3i User Manual: "Recovery Delay - 1 – 200 200 = slowest. Additional and separate (beyond filtration) selection for the signal response time. Short response time benefits performance in high trash by providing better target separation. A longer response time allows a larger window to detect deeper targets. Ideal Recovery Delay is dependent on Ground Filter selection, ground mineralization, trash density, and your average sweep speed (how quickly you move the search coil)." It would seem detector manufacturers abhor standard terminology, even the same manufacturer! XP has decided to call Recovery Speed by an even newer term - Reactivity. From the Deus User Manual:
  6. I'm sure most of you have seen that the price of some of the greatest detectors are under a thousand. The major ones have keep the price between 7 and 8 hundred with some less. This is all good news for us the buyer. For what I see I'm not getting something less in the detector but more for my money. I think detector companies know it's more of us out there that is willing and can afford 8 hundred are less. With the higher number of sales because of the lower price they'll make more money in the long run. That's my opinion but I want to know yours. Chuck
  7. Squeezed in a few hours this afternoon to complete a neat Pi project, the Pistol Probe. Also want to take the time to thank Gary Storm of Detector Pro for creating the Pistol Probe, Thank you Gary the pistol probe is one powerful pi. And Finnfoto for encouraging me to finish the neat gadget, thanks finnfoto! Well, Here it is the Pistol Probe converted into a pi detector. Yet, Retains the probe usage with adding back the Probe portion.... Was trying to retain the cool Pistol Probe appearance yet be able to shorten it up a little, hacked off the original Probe portion and added a connector. Using a Uniprobe probe stem allowed the project to work, just remove the Probe and connect the 10" 15us pi coil for pi detection.Was comparing this project with my HH Pi, both air tested the same and with the GrayGhost headset audio bangs out loud and clear. Only portion I hated was using an 1/8" headphone plug, had too no room for a regular size plug. None the less it may be the perfect solution, small yet effective allowing the GrayGhost headset to plug in. Three ways to use this, mounted on the S-handle, or hip mount inside a pouch or auctally it's small enough to fasten to the outer headset band if one wants to wade deep in water. Tomorrow, Sometime in the afternoon will hit a dry river bed. Should do well since both the Pistol Probe and HH Pi share the same 15us circuitry. Could have chopped it up into a smaller version, but that would destroy the neat Pistol Probe appearance. This was important, Maintain the neat stock appearance. I'll share tomorrows finds, thanks for taking a peek. Paul
  8. In most industries electronics folks get access to developers kits to build in their own tools and special features. By the time a product goes to market all of this control is stripped out to simplify the unit for general users, who are not usually experienced enough to use it. I was thinking why dont metal detector companies release two versions of code? One for beginners and another set for expert users. It would be easy i would think to pay a fee, get a key to plug in, else reprogram the units for a fee and get all the control i would ever need to work around any issue, gnd, etc out there. I am curious if other folks would like this and would pay for it?
  9. I have used many metal detectors over the years, and right now I have to say that the new Makro Racer 2 has perhaps the easiest to understand, best laid out, most practical display and menu system I have ever seen in a top end detector. Now, you can sure say you hunt by ear and do not need a screen and I get that, but if we are going to put a screen on a detector, then let's do it right. Simple detectors with few functions are easy to make screens for - there is not much you need. But even then just the basics are often wrong. Machines that feature target id numbers, what is the thing you will most look at on screen? The target id numbers! Yet these are often way too small or off to the side as if an afterthought. The Makro Racer 2 id numbers are huge, much larger than on the original Racer and Gold Racer, which are already good sized. The number 88 display in the diagram above is fully 1.5" x 1.5" in size in real life. Other machines have some pretty big numbers but I think this sets a record as I can't think of any machine with larger id numbers on screen though some are close. Makro Racer 2 LCD display and controls Makro Racer 2 screen layout Makro Racer 2 screen and control descriptions The number can be the ground balance number, target id, or depth reading. You get a text display just above the number confirming which it is. Below the numbers are three zone references, Fe, Gold/Non-FE, and Non-Fe, that are used to set tone breaks and audio for the three main zones or bins as they are sometimes called. Another basic feature lacking on a lot of machines - the meter backlight. With the Racer 2 you get off, intermittent, or full time backlighting, and it includes the translucent red control buttons. The control ranges between 0-5 and C1-C5. At 0 level, the keypad and display backlight are off. When set between 1-5, they light up only for a short period of time when a target is detected or while navigating the menu and then it goes off. At C1-C5 levels, the keypad and display will light up constantly. I do not know of anyone doing a better backlight. The right side of the meter is informational - ground phase (ground balance number), mineral % (ground magnetite content), coil warning notices, and a six segment battery meter. Across the top below the 0 - 99 reference sticker, is a series of 50 "bullets" each of which covers 2 target id numbers. Open bullets (which appear gray in the diagram but are invisible in real life - see top photo) indicate accepted target id numbers. Blacked out segments show what discrimination and notch setting you have programmed in a single quick glance. When a target is detected, the big number on the display will be mirrored by one or more of the bullets flashing dark. The four control buttons are simple as can be - up and down takes you through the left hand menu area. Right or left lets you set each function selected by going up and down. The menu is basically the entire feature list just laid out right there for you to see. You want to know what this machine can do, just look at the screen. Most other machines you have no clue without reading the owners manual or at least pushing buttons to see what functions appear. Some settings like the backlight are system wide for all modes. All other settings like Gain are independent in each mode, and can be saved independently in each mode. This means you can play neat tricks like setting up a couple modes with dramatically different settings and then flip back and forth easily between two modes for target checking. You even get to decide what mode is the default start up mode. The Racer 2 starts up in the last mode where the save function was performed. If you always want to start in Beach mode, just modify and save something in Beach mode. Next time you start the detector, you will be in Beach mode. It is simple. It makes sense. No cryptic abbreviations or acronyms. No sub menus. It is, in metal detector terms, a work of art. Whoever designed this should sign it so I can frame it and hang it on my wall.
  10. This could be an exciting development for prospectors if the cost is something most of us could afford. "Instead of a pan and a pick ax, prospectors of the future might seek gold with a hand-held biosensor that uses a component of DNA to detect traces of the element in water. The gold sensor is the latest in a series of metal-detecting biosensors under development by Rebecca Lai, an associate professor of chemistry at the University of Nebraska-Lincoln. Other sensors at various stages of development detect mercury, silver or platinum. Similar technology could be used to find cadmium, lead, arsenic, or other metals and metalloids." Read more at: http://phys.org/news/2016-02-hand-held-gold-sensor.html#jCp
  11. There has recently been some discussion somewhere in the forums about 20-30 KHz detectors recently and their applications for prospecting. I ran across this while reading a link on a thread at NASA Tom's Forum, a quote by Dave Johnson, design engineer. "Metal detector manufacturers generally avoid the 20-30kHz range because of electrical interference from military communications." Here's the link to the interview- http://www.fisherlab.com/hobby/davejohnson/davejohnsonjohngardinerinterview.htm Merton
  12. Some detectors have an "Iron Audio" feature. With "iron audio- on" it lets the operator hear the iron targets. So, does this feature just basically turn iron discrimination off so that you get an "all metal mode"? I ask because I am interested in the AT-Pro which has this feature but am wondering exactly what it does. I notice some guys in videos using the iron audio on setting yet they still turn up the iron disc. When I hunt with the FoRes CoRe I turn the I.D. Mask all the way down to 5 or less so that I can hear everything and let my ears do the discriminating. Am I basically doing the same thing as "Iron Audio-On" ? Thanks! Dean
  13. Hello Steve, I think it was about this time last year you posted your thoughts on new detectors for the upcoming year. Any insight on new PI or multi-frequency detector for 2016? For the most part, it seemed like 2015 was the "year of the low end detector".
  14. This subject comes up so often it is time to get it into its own thread so I can just link to it in the future. It is best to think of metal detectors made for prospecting as "nugget detectors" as that is the truth of the matter. Nuggets have some size to them. Metal detectors are electromagnetic devices, and as such can detect items that are conductive and non-magnetic, like gold, or non-conductive but magnetic, like magnetite. Or both, like metallic iron. When dealing with gold you are dealing only with conductivity. The more conductive the mass, the easier it is to detect. In general what this means is bigger is better. Any detector has a limit to how small an item it can detect. Here is the kicker. Multiple undetectable targets do not add up to create a detectable target. I do not know how many times I've seen or been told of people throwing a vial of small gold on the ground and running a detector over it and declaring the detector will not find gold because it does not pick up the vial of gold. Or people thinking the detector has a problem. Let us say that on a scale of 0 - 10 zero represents an undetectable piece of gold, and 10 one that really beeps. 0 + 0 + 0 + 0 + 0 still equals zero. So lots of tiny gold is just as undetectable as a single piece of tiny gold. You need a single conductive mass. Fine gold usually has a coating, and putting a bunch of fine gold in a vial still results in little or no signal. If the gold is super clean and packed tightly you will get a weak signal. Melt it all together, and now it goes beep. Another way to look at it is take some fine gold and pour it in a pile. Get a multimeter and test your little pile of gold for conductivity. It is hard to get much current if any through a loose pile of gold. So bottom line is you might have 5 ounces of fine gold right under your feet, and you will walk right over it with your metal detector. Rich gold ore where the gold is finely dispersed in the rock will be hard to detect or undetectable. Wiry or spongy masses of gold are hard to detect. Jewelry hunters run into this when trying to detect lost necklaces. A fine chain is very hard to detect as each link is undetectable and the connection between the links is poor enough the signals does not add up to much. Often all you can detect is the clasp. Rings even display this issue if the weld breaks. A complete ring really gives a great signal. Break the ring, it will be very hard to detect. Now once an item is detectable, it does add up. 10 + 10 = 20 so two large nuggets in the same spot are easier to detect than each by itself. If each link in the gold chain can be detected, then it will add up into a more detectable target. A fun trick with target id detectors is to tape 5 nickels together and run them under the coil. They will read as 25 cents!
  15. Thought I'd start a topic of a different nature. What detector/s would you like to see reintroduced and why, and maybe a new feature or two if you dare. The reason I'm starting this is because there's been some real fine units come and go over the years, and I think some are worthy of some new time in the limelight. Model: Brand: Why should it be reintroduced? New features that would be nice: Okay, this is really hard, but I'm going to limit it to 3: Model: Sovereign GT Brand: Minelab Why should it be reintroduced? Still one of the best discriminating beach/shallow wading machines ever made New features that would be nice: A more compact control box that was at least weatherproof so i didn't have to chest mount the control box. Model: Goldmaster 3 Brand: Whites Why should it be reintroduced? Seems like the appreciation for the GM3 came after it was long gone. New features that would be nice: Auto Tracking option like on the GMT, and would be awesome to add a lower frequency to make it a bit more versatile for relics, hotter soils etc. Sort of like a GMT/MXT hybrid but in the old style chest mountable control box. Model: Diablo uMax Brand: Tesoro Why should it be reintroduced? So I could try one, and see what all the fuss is about :-) But seriously, a very lightweight "utility" gold machine should sell well, as long at it works. New features that would be nice: A Disc mode with ground balance like the original lobo so you could use it for coins, jewellery and relics
  16. Take a look at this, an app based metal detector, I suppose it was only a matter of time. Don't know if it is any good but sure looks cool http://teslamd.ru/
  17. Has anyone heard any new information on the Fisher/ Teknetics CZX gold machine coming out soon? Fisher claims a new ground breaking technology, that will be able to see through highly mineralized soil, and red dirt? Dave
  18. Here is a good Sunday read for you. Reg wrote what is still the best introductory text on PI detectors. Recently he added extra chapters at the Findmall forum. Even if you read the original before it is worth reading again. Understanding The PI Metal Detector by Reg Sniff Part One http://www.nuggetshooter.com/articles/UnderstandingPIdetector.html Understanding The PI Metal Detector by Reg Sniff Part Two http://www.nuggetshooter.com/articles/UnderstandingPIdetector2.html Deepest PI Detector by Reg Sniff Part One http://www.findmall.com/read.php?34,1777531 Deepest PI Detector by Reg Sniff Part Two http://www.findmall.com/read.php?34,1777531,1777710#msg-1777710
  19. This is an informal survey, just out of curiosity. For those of you who have been out prospecting in the last year (back to Sept 2014) and actually have found gold nuggets, what detector or detectors did you find the gold with? The poll is not meant to prove anything. I am just wondering what detectors are most commonly in use now for finding gold nuggets by those who are actually finding the gold. I am posting this on the most of the active US forums so please do not post your answer in more than one place. In a week I will compile all the answers from all the forums and post the results back to each one. Thanks in advance for you participation. I own a number of units but so far in the last year my gold was found with the Minelab GPZ 7000, SDC 2300, and a few nuggets in trashy areas with the Makro Racer.
  20. I see this over and over on the forums. People requesting that this machine and that machine be air tested on a dime to see which gets better depth. All it really does is tell you how well the detector can find things in the air, but I do not use a detector for that myself. I do a lot of air tests, but I am only looking at depth from a relative perspective and not as how two different models compare for depth in the ground. In other words, if I have two Gold Bug detectors and set up identically if one gets far less depth than the other there is a problem with the detector. Detectors will rarely detect deeper in the ground (I did not say never) than they do in the air, so if a detector air tests on a dime at 10" I am not going to expect it to do better than that in the field as a general rule. If a detector cannot detect a tiny nugget in an air test, I do not expect it to get that ability in the ground. Air tests generally tell you about a detectors maximum possible performance, and in the ground things will usually go downhill from there. I also like air tests to learn how a discrimination system may identify certain items since different detectors use different sounds and id number scales. Very often I just want to hear how the detector sounds. Is the signal modulated or boosted? Does it employ VCO audio? Short chirps or big booms? I have to listen to the thing all day long so I prefer something that is pleasant for me to listen to. Air tests can also teach me a lot about how a coil responds, especially to small targets which do radically strange things under DD coils at close range in particular. Depth though, when we are metal detecting, is all about how detectors handle ground. In fact there is almost nothing more important than how the detector handles the ground. Without the ground, depth tests can mean nothing at best and at worst can be quite deceiving. With VLF detectors low frequency models generally handle ground better than high frequency detectors, but high frequency models often air test very well. A Fisher Gold Bug 2 air tests really well, but the depth in ground drops off faster than most any other detector made due to the very high 71 kHz operating frequency. When I was up at Moore Creek I had a guy insist that the Fisher Gold Bug 2 would detect a large nugget deeper than a Fisher F75 because, by golly, he had air tested them. No amount of talk would convince him otherwise, so we buried a 1/4 oz nugget and the F75 easily hit it deeper than the Gold Bug 2. The guy was amazed by something I thought would be very obvious. I forget people do not know how metal detectors work and the effects of the ground at different frequencies. It is not always true but a generality is low frequency detectors will tend to retain depth better in ground than high frequency detectors. Pulse induction detectors are sort of like super low frequency detectors in that ground is relatively invisible to them. Not totally so by any means but compared to a VLF a PI has built in ground capability just because of the way they work. Often a PI detector will not air test very well compared to a VLF, but put them in bad ground, and the PI loses very little if any depth while the VLF takes a big hit. The worse the mineralization the worse the VLF does by comparison to the PI detector. So another generality is that pulse induction detectors do not air test well compared to VLF detectors. A lot of very good but less expensive coin detectors have no ground balance control. They air test just fine against far more expensive detectors. Put them on bad ground however, and the lack of ground balance control just kills them. Something rarely ever discussed is ground balance systems and how they work. Ground balance methods vary and often are proprietary and closely guarded secrets. These days it is far more than just a knob. Detectors like a White's GMT or MXT were among early models employing software algorithms to ground balance the detector. Minelab multi-frequency detectors employ very sophisticated ground balancing methods that help account for how well those machines work in differing soils and even saltwater environments. They are designed with the goal of delivering accurate target id information as deep as possible as opposed to absolute depth and the accuracy they deliver is cutting edge. Ground balancing and accurate target id go hand in hand. It should be obvious that a detector that has factory preset ground balance is going to suffer in bad ground. But past that point, what do you really know about the ground balance method employed by a detector and how good it is? More importantly, how is air testing going to help teach you about it? Yet another generality is that multi-frequency detectors do not air test well against single frequency detectors. You can go farther and just say air tests teach you nothing about ground handling capability. The degree and efficiency with which a metal detector handles the ground conditions it encounters is the most important thing there is when it comes to depth in the ground, and air testing does nothing to reveal this most important attribute. It is very easy to have detector A go twice as deep in an air test as detector B and see the situation reverse in the field. In theory if you air test two detectors, both the exact same model, and they air test the same then they should get the same depth in the ground, right? But what if one detector has a ground balance system that is not functioning properly? They air test identically but one still performs poorly compared to the other in the ground. The absolute most important advances in the metal detecting world have been in ground handling and most of the real breakthroughs in recent years have been in pulse induction detectors employing very advanced methods to deliver depth unmatched by other detectors. These advances are only apparent in the worst ground conditions and so leaving the ground out of the testing is nonsensical when you think about it. To sum up, we use metal detectors to find items buried in the ground, and when prospecting in particular highly mineralized soil can have severe impacts on detection depth. Only in ground testing has anything like any validity, and even then freshly buried target responses are suspect due to the ground being disturbed. Even buried test targets however are far preferable to air tests. A lot can be learned from air tests, but how a detector will perform in the ground is just about last on the list when it comes to relevance.
  21. Every piece of gold I have run across my machine I get a reading between 42 and 48.... Someone showed me a 1oz. nugget and when I ran my machine over it the target i.d was 82 so I was guessing that it wasn't a good quality if any gold at all...the person said because of its size the reading was higher....WEEEELLLLLLL when I got home I ran a 1/2 oz and a DWT piece over the coil and each pulled a reading of 44 and 47... I ask if this is correct because while hunting I have run across targets of 80 and up and from my experience with my machine that is usually bird shot or some other metal other than gold and I ignore some targets because of this...AM I PASSING UP GOLD NUGGETS???
  22. While looking around on the Minelab site I came across this article by Bruce Candy. It will certainly be a re-read for some but for me it was a first. There is much more than just Minelab in the article. It included ground balancing, discrimination, gold detectors, coin detectors and a host of other related issues with knowing some of the technology about target detecting. It doesn't yet include ZED technology but does explain why it is so hard to have a gold detector that discriminates. (When you discriminate you lose targets!) Metal Detector Basics & Theory by Bruce Candy
  23. I am different! I want to know why and what makes it work, what makes it different. I want to know the technical differences between products. The manufacturer can give a detector a name and claim that his detector is the best for detecting for gold. Sorry, manufacturer's claims come in one ear and out the other. Give me the facts and let me decide. I am going through the process of de-coding manufacturer claims and guess what. It is real hard to just find the facts. Right now I am searching for a list of the operating kHz frequencies of all metal detectors. Let's face it, a coil just creates a magnetic field and the only variables on any coil is the kHz frequency and the size of the coil. At least those are the two variables that I have found so far. I really need to know whether the kHz frequency is determined by the operating frequency for the Detector control box or is it controlled by the operating frequency of the coil? It makes sense to me that when you wind the copper wire into a coil that you should be able to determine the coil's kHz frequency by the number of winds of the copper wire, when you are making the coil. So, I am thinking that the coil actually determines the frequency that is built into the control box of the metal detector. Am I right? What I need now, is for someone who knows more about the industry to step up to the plate and provide a list of the kHz frequencies of the metal detector coils that are currently on the market. Any two coils that has the same kHz frequencies, whether it is made by the same manufacturer or not, should be interchangeable. A magnetic field is just a magnetic field. The operating kHz frequency, does it affect the magnetic field? If so, I need another expert to tell me whether different frequencies get better results, depending upon what the prospector is searching for. Please, do not respond to these questions unless you have scientific facts to back up what you say. If anyone can set me straight and help me get the facts I'm looking for, I would appreciate your time and effort. Don't worry, any response you give will not offend me. Thanks, Professor Hester
  24. I heard this rumor once white had chance at buying out minelab, any truth to this? It was years ago.
  25. With modern ARM or similar type MCU's with some of the DSP capabilities built in and programming easily altered or updated I'm not sure I understand anymore why we are still stuck with the solid state mindset that x detector has to be y frequency only. A guy shouldn't have an issue switching to 60khz or 30khz or 7.5khz or whatever he wants without having to buy proprietary peripherals like special coils. This doesn't have a lot to do with the Makros in particular, but this line of thought leads me to really wonder when we see the first "open source" detector. IE, one that allows us to go in and hack around in the programming, and open source schematics so we can make custom mods without figuring out how to dissolve 5 layers of epoxy potting without killing the components or having to brute force decrypt MCU coding. So, since I know the Makro guys read this forum, if a company really wanted to take the next step and to be revolutionary in the detector world - provide us all with 2 open source platforms (meaning both software and hardware open source) - a PI and a VLF. Breakout all the relevant MCU pins too or allow easy access to hook up another dev board like the BeagleBoard, Raspberry PI, etc along with the interface to a computer for programming. Detectors, even Minelab, until the last few years have really been stuck in the stone age it seems to me any computer or phone nowadays allows for all kinds of mods and hacking. I think you'd see a lot of real interesting innovation happening by DIY'ers within a few years with a platform like this, and it might give Minelab some pause at offering detectors at (disclaimer, just a guess) $8,000 or whatever. Sorry to ramble, this post just got me thinking.
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