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  • My detector can beat up your detector

    Now, that I have at least a few people's attention, hopefully, we can air out a few things, like why we have to criticize or degrade another design.

    This seems to happen all over the net and what is worse, complaining comes from some really odd logic in my opinion.

    I mentioned that if you can't build a better moustrap, you really shouldn't complain about the one you use. I will always stand by that position.

    Before the days of the GS 5 and the TDI, I took one of Eric Foster's low powered PI's and modified it by adding a quick and dirty version of ground balance. The basic design to the point I could minimize about any type of ground. Later, as a challenge to make a PI that could see what one guy called invisible nuggets, I worked on several things and finally built a detector that could detect the so called invisible nuggets that were sent to me. (BTW, the guy who offered the challenge was nice enough to send me a couple of the nuggets he called invisible.)

    When done, the little PI worked reasonably well and I had success finding both gold and meteorites with it. What made this detector neat was the fact it could actually detect smaller gold than the most powerful PI more commonly used at the time.

    For some reason, my little detector was ridiculed because no one could "see" the need for a PI to find the small stuff. Instead, it was always pointed out how much deeper the big boy could go on the bigger gold.

    The problem with this concept is most gold found, at least here in the US is the small stuff. So, I was quite content with my design. Unfortunately, I caught a lot of flack and degrading of my little detector from a lot of people defending the big boy.

    Well, I can say, the constant bashing did get old, so my solution was to simply quit posting on the one key forum where most of the trash talk occurred. I still don't post on that forum and probably never will.

    More importantly, I quit reading that forum because I could care less about the badmouthing of any detector, let alone mine.

    Now, I learned most of the limitations and quirks of my detector and was quick to point out those quirks when people asked. Why? Well, I didn't care if people copied my ideas and if they did, I would prefer they knew what to expect so there were no surprises or reasons to criticize me later because the detector wasn't perfect.

    In the process of developing my detector, I made several comparisons of my unit against the one brand normally used for gold hunting. During that testing, I stumbled on to something that had gone unnoticed or at least not discussed since the existence of that detector. As it turned out, my little PI would or could detect one certain 1/4 oz nugget far deeper than the big boy on the block.

    As it turned out, the idea of "holes" in what it could detect became obvious. Later I read where the design engineer mentioned this hole condition.

    Well, as it turns out, there is always going to be "holes" in the PI detection of objects regardless of who builds it if the ground balance is based upon the present concept. So, even today, it has been pointed out on a different forum that the big boy on the block suffers from them as does other ground balancing PI's including the GS 4 which many people are trying to build now.

    The White's TDI has hole's also. Yep, and I have mentioned this and how it occurs. Now, what I did not see is Carl ranting about me pointing out the characteristic many people would love to call a flaw.

    This isn't a flaw but a consequence of the design coupled with the characteristics of how a PI works. Better yet, knowing a few things about this characteristic and how the detector works, the ability to offer a level of iron rejection or what one might call a crude form of discrimination became known. On a PI, this was unheard of.

    So, this characteristic, quirk, or whatever it is called became an asset because now many people use certain adjustments and this characteristic to use a PI to hunt coins.

    If I or anyone else had decided to rant or try to hide the basic discovery, this feature or ability to use the PI for other means, just may not exist today and the key to its success is because of the fact the quirk existed and was exploited instead of trying to hide it.

    Here is something most people don't know about this characteristic and that is, Eric Foster implemented a coin hunting feature into his earlier Goldscans capitalizing on this feature. Yep, back in the 90's, Eric build the Goldscan with the ability to ignore many nails but still find certain coins. What Eric had built into his earlier detectors was the "Low Conductor" mode, a feature now found on the TDI.

    So, why did this unique feature go unnoticed for so long???? Well, I attribute that to stubbornness and ignorance of the overall design. What is interesting is on one of the earlier forums often read several years ago, lots of theories evolved as to why certain nuggets couldn't be detected at any depth to speak of. Today, I strongly suspect at least some of those nuggets were difficult to find because of this hole concept.

    Regardless of the PI detector, if it has a form of ground balancing and different objects generate different tone characteristics such as a low tone for some and a high tone for others, or maybe a low high for some and a high low for others, there will always be some form of a hole. In other words, certain objects will not be detected to the depths one might think they should be.

    *****ing or ridiculing this condition serves no purpose. Worse yet, not willing to fully understand why it happens can result in some really bad reasoning which usually leads to less than the best results.

    What is truly sad is on a different forum certain "holes" were discovered but rather than try to figure out why or the characteristics of that hole, the only thing that really resulted was criticism.

    A wise person just might have wondered if this oddity occurred on other modes of the detector and set out to find the answer. Better yet, it wouldn't have hurt to do what I did and find what it took to use the detector's characteristics as an advantage and how to overcome or get around the weaknesses as much as possible.

    knowing limitations exist and how to get around them or use those limitations is what makes a PI owner stand out in a crowd. Chances are, the person with the knowledge will be the most successful in the long run.

    So, for those people who are adamant about defending their detector and not willing to accept the facts, only hurt themselves in the long run.

    I used to try my best to teach the brick to float, so to speak but with gold becoming harder to find, I have decided to let those not wanting to learn, go their merry way. Instead, I just smile and hunt behind them.

    Reg

  • #2
    Of course, the majority of detector users have no idea how a PI achieves ground balance, and therefore no concept of the "hole" that is created by using that particular technique. On the other hand, in bad ground you often have to put up with the "hole", in order to find anything at all.

    Also, I totally agree ... rule #1 is "Don't bash the competition".
    It sends the wrong message to your audience, and focuses the discussion around the competition instead of your own product. It also damages your credibility.

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    • #3
      Reg your analyse is great as always.

      But maybe we have to speak about fine dividing line between religious and technical question.

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      • #4
        Hi Q,

        Ground balance on PI's has been discussed multiple times before, but I will review it here to help with the explanation.

        The PI is unique in the fact that about the only present way to create the ability to ground balance is to take a primary sample and then take a later sample we can call the GB sample. Take the later sample, amplify it until the ground signal in the later sample is equal in amplitude to the main sample ground signal and then subtract the later from the main.

        The result is equal signals will cancel, thus the ground response is ignored. Put in different terms, the ground signal appears to fall into a hole where it can't be detected.

        The problem with this design is any other target that meets the same criteria as the ground signal, meaning the later sample signal equals the main sample signal also gets ignored or also falls into the imaginary hole. So, if there is anything else such as a piece of gold such that the target response in the later sample matches the main sample signal and the two are subtracted, the gold is also ignored.

        Fortunately, usually, the metal that falls into the hole doesn't act quite like the ground which means it normally doesn't completely disappear but may do so over a height range. So, one might not hear anything from that metal at 5" from the coil but may get a signal at a nearer or farther distance. Usually the heard signal basically indicates, the target response appears to be much weaker or be heard at all at a farther distance which is much less than what one might expect.

        So, to ignore the ground signal by the subtraction process and you will also ignore any other object that also has the same thing happen to its response as what happened to the ground signal. Change the technique a little like the time between samples and slightly different objects will be ignored along with the ground signal.

        Change the subtraction process a little like change the amplification used and now the ground isn't ignored, but something else might be.

        So, for those of you who didn't know about the "hole" concept, this is basically a simple explanation.

        One other bit of wisdom is at the time of subtraction one of three things will occur. The signal will still remain the same in tone as the main sample, the subtraction process creates the hole, or the GB sample is the greater of the two signals and thus, the tone changes.

        On the TDI, we get one of three things happen. The new combined signal is either a high tone, no audio change (fell into the hole and disappears), or the tone changes to a low tone.

        On other PI's, we may get a high/low signal often referred to as a wee/woo, little or no audio response indicating the two samples are balanced, or we get a woo/wee audio which now is a low/high tone response.

        Keep in mind that if the tone changes, it is almost certain that something has to exist where the tone change occurs. At this point, most likely something has fell into the imaginary hole and is ignored.

        Reg

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        • #5
          very insteresting Reg

          Philip

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          • #6
            Ground balance, subtraction,scaling etc, are all rather archaic in their approach. There are better ways, or should I say a better way. The ground "ignoring" functionality is the largest obstacle for getting superior performance.

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            • #7
              Excellent posts, Reg. Folks also don't realize that the exact same thing happens with salt subtraction in multi-frequency VLF detectors. The salt response falls into a notch (hole), but so will certain target responses, mostly foil but can include tiny nuggets.

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              • #8
                Originally posted by Carl-NC View Post
                Excellent posts, Reg. Folks also don't realize that the exact same thing happens with salt subtraction in multi-frequency VLF detectors. The salt response falls into a notch (hole), but so will certain target responses, mostly foil but can include tiny nuggets.
                And in turn if you want the small silver ie ladies/childs ring/bracelet, you need to dig the small foil otherwise you loose out.

                Brilliant topic may I add, I had never here of the Hole concept before, very interesting and well put Reg

                Regards

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                • #9
                  As usual, great post Reg.

                  Cheers

                  Muntari

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                  • #10
                    Yep, my detector can beat up your's, your's, .., the World's best, the Ultimate Detector, your's and your's detector with ease.
                    *LOL*

                    Great title and great post from Reg. Thanks.

                    Aziz

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                    • #11
                      Nice to see your posts again Reg .. always an interesting read ..

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                      • #12
                        Here is something else to think about that most people don't realize. Manufacturers don't have time to run the thousands of possible tests that probably should be done before any product is produced for sale. So, about every detector goes out with bugs of some kind.

                        Whatever might be the issue may it be small or quite important, the sooner such a quirk or issue might be addressed the sooner such change helps the manufacturer keep its credibility with its customer base. The reason is simple, most manufacturers would prefer to fix a bug sooner than later.

                        Now, when we have those people who can't stand to see their favorite prize detector "bad mouthed" and quickly try to do their best to shut down any such talk that they feel is bad talk, they become one of the big problems and not the solution.

                        Failing to recognize and address issues only cause bigger problems and delay minimizing such problems or finding solutions sooner.

                        Worse yet, not letting a new owner know about any quirk or a possible solution, only hurts a potential owner and his respect for the company. Worse yet, it allows valuable targets to be missed by those who have spent a lot of money trying to find them.

                        So, those who defend their favorite product to the end, usually are actually hurting the cause in the long run, regardless of what they think. Did it ever occur to these people that the manufacturer might just want to know the bugs? Better yet, does anyone really think the manufacturer can't defend itself if it felt the information was truly harmful?

                        In simple terms, finding and making quirks known as soon as possible but doing it so constructively, actually helps everyone including the manufacturer in the long run.

                        On the other side of the coin, once an issue is found, bad mouthing the issue does no good either. The cold hard fact is, issues will always be there because of the characteristic design so finding and potential weakness is extremely important so both solutions and recommendations can come forward.

                        If a person wants to really help, they point out a quirk but do so constructively. If they have found a solution, then make that known also. If a quirk only occurs under certain conditions, that quirk may not be the flaw one thinks it is, but a quirk that is time, temperature, or speed oriented.

                        The old Teknetics Mark 1 was a fantastic detector but would fail miserably in bad ground if the operator tried to use it like the older faster motion machines. Slow the Mark 1 down to a nice granny pace and, contrary to many articles, the Mark 1 worked fantastic even in the worst ground locations. Once a person knows this and uses the proper technique, significant increases in depth were possible.

                        If the Mark 1 were to be brought out today, the potential success would probably have never happened. Naysayers would quickly scream foul because that detector didn't work like they expected it to act. So, instead of becoming one of the most revered designs, today it probably would be ridiculed.

                        An opposite situation is most likely what caused the Early Goldscan PI's from not becoming popular. Lack of information or knowing what one might expect made it easy to determine this detector didn't work right. Actually, it worked right but because people didn't know what right was, it appeared to fail.

                        I know because when I first had the old GS 4 completely ignore a nice solid 1/4 oz nugget, I was stunned. Pick one of the SEL modes and this was possible, especially if the ground balance was set just right. Once I understood what was happening, it made perfect sense.

                        So, in my opinion the big reason the old GS4 failed wasn't that the detector was bad because it wasn't. What was bad was the information about what to expect in all modes and, more importantly, why.

                        Today, people complain because the TDI displays a reduction in depth when air tests are run comparing ground balance (GB) on and off. The reduction is real but it doesn't happen just on the TDI but also on most other PI's that have a ground balance feature. Yes, the mighty big boy suffers also. The big difference is, most previous models didn't allow the owner to compare GB to no GB.

                        Because there are ways to reducing the GB depth loss effect such as using some motion techniques to reduce the ground signal, it is possible to vary this depth loss. Add faster filters in the autotune portion, add an additional filter or two, and the ground signal can be reduced significantly to the point the ground signal isn't a problem. The result will be a detector that does show a little more ground signal if the coil is bobbed quickly but far less depth loss.

                        Something as simple as using absolute amplifiers and then two or more GB balanced signals with different characteristics, meaning the sampling timing was changed or some other variation of one of the other parameters and the result would be less depth loss plus a potentially smaller hole characteristic. What would be lost would be the ability to differentiate signals easily like what can be done on the TDI today.

                        Do my ideas work? Yep, at least most of them do because I have tried them, or better stated, used them. There are a few ideas I haven't tried or mentioned for that matter, so I can't say for sure they will work but I see no reason they won't.

                        I have had to stumble into the quirks in my developing my ideas mainly because of what I call the stubbornness and stupidity of those owners who scream when someone points out a bug. I can't find them all and could use help without all the stumbling blocks put forth by owners trying to protect the reputation of their stepchild of a detector. Unfortunately, I see no solution to changing the minds of so many people.

                        Reg

                        Comment


                        • #13
                          Originally posted by Aziz View Post

                          Yep, my detector can beat up your's, your's, .., the World's best, the Ultimate Detector, your's and your's detector with ease.
                          *LOL*

                          .
                          Attached Files

                          Comment


                          • #14
                            "My detector can beat up your detector!"

                            Oh yeah!?
                            My detector's name is "Lennox The Deus Lewis"!
                            How about that beating now?!

                            Comment


                            • #15
                              And "my" hedgehog is named Bero and s/he clears more junk than all your detectors combined

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