Steve Herschbach

More info here on similar coils.... https://www.detectorprospector.com/forums/topic/11568-nuggeteer-anti-inteference-12-x-4-on-tdi-pro/

Basically looks like a knockoff of the Jimmy Sierra T-Foot coil. As a long narrow coil you should expect a ton of depth. It is more to cover ground, like a huge beach. The price is not horrible at least.

I found this old ad from 2010: "Special Made coils for the Whites TDI Pulse detector”, you pick from list I will build. All coil's or hand made an super light, the 18 inch mono coil weight is only 1 pound and 3oz. Price depends on size. If interested E-Mail at lamarcannon@comcast.net, or phone me at 601-859-7576. Lamar Cannon the Duke "Special Made coils for the Whites TDI Pulse detector", you pick from list I will build. All coil's or hand made an super light, the 18 inch mono coil weight is only 1 pound and 3oz. Price depends on size. If interested E-Mail at lamarcannon@comcast.net, or phone me at 601-859-7576. 18" INCH ROUND MONO COIL 235.00 ----- 14"X18" INCH MONO COIL 235.00 ----- 6" INCH ROUND MONO COIL 125.00 (I CALL IT THE LITTLE BAD BOY.) All international shipping is $40.00 ------- $17.00 U.S. A: 11" O.D. Open search coil housing with liquid tight pigtail, for P.I. Detectors, color Black. B: 8" Closed coil with liquid tight pigtail, color White. C: 14"x10" open loop coil for DD PI Detector, , black. D: 5.25" Closed coil , liquid tight, color White. E: F: H: 11"x8.5" open loop coil for DD detectors, , black I: 7" Open coil , with liquid tight pigtail. Color White. J: K: 18"x14" D, PI Coil Black -------$235.00 L: 6" Spider Coil , Black ------------- $125.00 M: 12" Spider Coil Black N: 8" Spider Coil , Black O: 9 3/4" x 4 3/4" Gold Bug style coil housing P: 12" x 3 1/2" Coil Q: 15" x 3 1/2" Coil R: 18" x 5 1/2" Coil S: 18" Spider Coil ---------$235.00 T: 9.75" Spider Coil U: 12" Spider Coil (heavy duty) V: 11" Closed Loop Coil W: 8" Compass Style Closed Loop Coil X: 18" Open Coil Y: 17.5" X 8" Tappered, Bush Coil Z: 8 - 8" PI Coil White Z: 10 - 10 " PI Coil, White Z: 12 - 12" PI Coil , White Z: 13.5" PI Coil Housing, White All coil housings are formed from .062 black ABS plastic. All ears are .750 I.D. All ears are epoxy filled. All coil housings come complete with top and bottom. All items are vaccum formed with the exceptions of items B, D, F, and J, that are injection molded.

Sound legit, aftermarket coil, but not that great according to the thread above. Then again people may have been expecting too much from what is basically a stretched out 5” coil.

By older stock I meant the dealer had it on the shelf for a long time. I used to buy large volumes. The detector I sold you may have been on the shelf for up to a year. Probably no way for most people to know though. Some machines, like White’s, have a code built into the serial number that tells you date of manufacture.

Well, it is a coil. Is it made by White’s? No. But lots of people make aftermarket coils. That is not necessarily a bad thing. A link to the listing would provide more information then just the picture, like what models it’s supposedly for. Looks like maybe TDI?

I have to interject. VLF is a misnomer. It simply means Very Low Frequency. It almost always is used now however to apply to most Induction Balance metal detectors. We only have two basic technologies in use. Induction Balance (IB), and Pulse Induction (PI). Induction Balance continuously transmits and receives simultaneously. There must be a transmit coil (TX), and a receive coil (RX) that are in electronic balance. They induce a current into the target. Induction Balance. Pulse Induction alternately transmits and receives. A PI can even use a single coil that alternates between the transmit and receive modes. This is not possible with an induction balance metal detector. Each transmit phase is referred to as a pulse. A current is induced into the target. Pulse Induction. Induction Balance detectors normally employ frequency domain processing to collect phase information about a target, which is where the discrimination information comes from. Pulse Induction detectors employ time domain processing to measure the decay of the current induced in the target. A detector cannot be a pulse induction detector and an induction detector. It must be one or the other. There is no such thing and never will be a hybrid of the two. There detector either continuously transmits or it does not. Period. Pulse Induction detectors cannot determine phase and so cannot employ frequency domain processing. However, Induction Balance detectors can employ time domain processing. Minelab has done so starting with the BBS series multifrequency units. One might refer to these as hybrids. Induction balance detectors employing time domain processing. The MDT 8000 is not a pulse induction and cannot be compared directly to the GPX or ATX or other pulse induction metal detectors. That is a different class of detector. The MDT 8000 is an Induction Balance selectable single frequency detector employing time domain processing. It therefore compares more directly to the CTX 3030 and other Minelab multifrequency induction balance models that also employ time domain processing. So if VLF is a loose term referring to induction balance metal detectors, the MDT 8000 is indeed a what people commonly mean when they say VLF metal detector. It is not a pulse induction metal detector. Tarscacci MDT 8000 Patent Application None of that takes away from or diminishes what Dimitar is doing. It is unique and has the patent application above pending. I just hate when terms get tossed around in a confusing fashion. It is like how the manufacturers have screwed up what all metal mode means by labeling full accept discrimination modes as all metal. Or Nok/Mak calling selectable frequency multifrequency. Throw out all the marketing and just pay attention to what machines do and how they perform in the real world. The proof is in the pudding, as they say.

Been awhile since we have heard of one leaking. I thought they had a handle on it. Any chance yours was maybe older stock? Regardless, sorry to hear about that!

I agree if it was just a typical single frequency detector. But we are talking single frequency with time domain processing, a slightly different beast. Don't know yet, but I'll find out and let you know!

I have been intrigued by the Tarsacci MDT 8000 since it came out. And since then there have been some very interesting reports about it. In particular, I have read reports on inland use for relic detecting with great interest. The MDT 8000 appears to have great potential for much more than beach detecting, in particular pulling non-ferrous targets out of trashy mineralized ground. This excerpt from the recent interview with designer Dimitar Gargov in particular caught my eye - emphasis added: "So we started thinking about introducing this new technology to the market. What makes this detector different is that it handles salt environment, AND,,, mineralized ground simultaneously, both can be adjusted independently. This means that you can reject one or the other or both simultaneously, and this gives you the ability to swing your coil from the dry to the wet sand without changing your ground balance. If your ground balance has changed, this means your Salinity balance is incorrect. We started calling this the “Salinity Balance” for a reason. The main target for this machine was the beach hunters, even though I am a relic hunter. This detector was originally designed for LAND. It has a fast response time, has fast ground balance. The Salinity Balance, I call “salinity” just for the beach hunter but actually, this Salinity Balance helps you reject and to ignore fertilized ground, reject hot rocks like natural graphite, which is non-magnetic but all machines detect these hot rocks because they act like low conductors. Coke, it’s another one. In the same group we can put in the very small foil pieces, their in the same group of targets. And with the Salinity Balance, we can balance out these targets and we can see through them with correct i.d. This is the difference, because this machine does not unmask the salt, it is actually “seeing through” the salt, and the hot rocks using this “see-through” technology. For a lot of the detectors, if we are in the salt environment, or if we have fertilized ground, the depth starts to be greatly reduced. This is not true with Tarsacci, thanks to this new technology, actually this environment may help you. Your preserving the depth, and you will see even deeper than the air test, with the exactly the same settings, what I am saying, this means you set the ground balance, sensitivity, and the threshold and these are your working settings." Well, here is my issue. I nugget detect in places with two types of mineralization that give me trouble. The typical hot rock infested mineralized ground encountered while nugget detecting is one. The other is less common - the alkali salt laden desert areas, especially common in northern Nevada. Some of these places have so much salt in the ground they are just like detecting on saltwater beaches, and when they get damp for any reason, many top gold detectors struggle or fail to operate due to the high salinity. It is just like detecting on a saltwater beach. Finally, I have many places, especially in the Sierras, that are absolutely riddled with ferrous trash. In fact, my last outing last fall, I was hunting one of these. I was having no luck finding gold, just digging trash target after trash target. It used to be I would just stick with it, but I must be getting old. I quit with half a day left and went home. The trash beat me. I've been thinking about that all winter, and thinking about the MDT 8000, and finally decided I need to give this detector a try gold nugget detecting. It can run at one of several different frequencies, 6.4 kHz, 9 kHz, 12 kHz, or 18 kHz. Normally I might run higher frequencies when chasing small gold, but I do not see the MDT 8000 as a small gold detector. Rather, I see it as a possible alternative to pulse induction detectors for finding a little larger gold nuggets, but without the need for digging so much trash. I plan to practice with half gram to gram size nuggets as my potential desired targets. I know there are plenty of those still out there in some of those really trashy locations, waiting for a machine that can effectively discriminate out the trash, while getting more depth than the normal crop of nugget detectors. Anyway, I have a MDT 8000 on the way to me in the near future, and plan of seeing how I can do with it nugget detecting. I will probably also do some beach detecting with it up at Tahoe, but that really is not my main reason for getting the detector. I like trying oddball things that other people are not doing, and I've not heard of anyone giving the MDT 8000 as serious go as a nugget detector. I'm just the guy to give it a try. Tarsacci MDT 8000 Data & Reviews I have to say also that I think the MDT 8000 is a sharp looking detector!

Thanks for posting the interview Aaron!

I think the best solution for a lot of people is going to be to wait for the version FT is working on now that will address all the battery and waterproof depth rating issues. They are hard at work on it, and I do not think it will be forever, like maybe by end of year? After waiting several years a few more months can't possibly kill anybody, and most of us already have other detectors we can use in the meantime.

I just tried my two coils and the concentric does hit harder. That is one of the advantages of a concentric. However, in very mineralized ground that advantage disappears and the DD is usually the better option. I would always use the concentric personally unless I was getting to much ground feedback/overloading or hot rock problems. More on the subject soon, a little busy at the moment.

Are you saying you have both coils and the concentric tests better on a surface target? It very well might. The DD coil has an air space between the windings and the bottom of the coil. I’ve been meaning to post on that and will soon.

From what I saw Alexandre is doing a better job than I would. I excel at content. Look and feel I lean to simplicity because my graphic arts skills are only so-so at least. I have a good eye for photography, but layout and design, not so much.

Wow Carl, I was thinking of exactly the post and chart from Eric, and it was on my list to track it down and post here. Here is another quote from Eric - I used this tidbit as a general rule for a long time: Coil/target optimisation can be quite complicated, but it can be broken down into a number of separate considerations. I will deal with just one, at the moment. The diameter of the coil in relation to the target size is perhaps the most dominant characteristic. If we look at a mono coil, which is the simplest to understand, the optimum coil size is one that detects the target at a distance equal to the coil radius. e.g. if you have a 10in coil that just detects a target at 5in, then going either up or down in coil size will result in less range. If, however, your 10in coil detects a target at 10in, then the coil is not optimum, and going to a larger size will give more range on that target. In fact, the optimum coil for that target is 27.5in diameter, and it will detect the target at 13.7in. Say your target was big enough to detect at 15in with the 10in coil. The optimum coil size would then be 46in diameter and the target range 23in. Coil sizes get bigger quite rapidly, and more cumbersome, but because the coil radius/range curve is very flat as you approach the optimum, you could reduce to a 30in coil and still get just under 23in. All this assumes that everything else stays constant. i.e. TX current, inductance etc, and also pickup noise. If I can find it, I will post a graph of coil radius/range curves. Eric. Anyway, thanks for posting that Carl, saved me a little time searching my hard drive archive. All ways of saying that for each target there is an optimum coil size, and going too much smaller or larger loses depth. But that is air tests - the caveat always is ground conditions. We have target masking, extreme mineralization, and EMI to deal with, and very often the solution is a smaller coil. Yet manufacturers have tended to cater to the burgeoning number of amateur testers that quote air tests or tests in clean low mineral soil, leading to machines actually optimized for those conditions with larger coils. White's move from the 9.5" coil on the MXT to the 12" coil on the "new" MXT 300 was that kind of a head fake. Same detector, but "new, improved model with more depth!" Well yeah, because the coil is larger. And frankly not exactly true. Depth actually was worse under some of the conditions I have described by going to the larger coil. I think new detectorists in particular would benefit from using more moderate coil sizes when starting out.

This all is consistent with how I very often nugget hunt. Either VLF small coil, or PI big coil. My favorite VLF nugget coils have been 6” or smaller concentrics. My favorite PI nugget coils were 16” and 18” rounds. Very often I am hunting for small gold, or hunting for large gold, and optimized for either. Some places there simply is no large gold, and if you are not set up for the tiny stuff, you get nothing. But if larger gold does exist, it adds up faster than chasing tiny bits, and it’s best to set up for that. The GPZ in my experience was the best of both worlds, finding a wider range of all sizes with one medium size coil.

Well that brief sneak preview looked very nice... you have a talent for building websites Alexandre, and a much better eye and ability in the graphic arts than I have.

Now we are talking, big step in the right direction. The site is nice and modern looking. And the big news... it is officially the Impulse series, with two models explicitly mentioned.

How about First Texas learning to master social media instead of all this secrecy? Rule number one, communicate regularly with your customers. Rule number two, do so with honesty and transparency. I have found people will forgive anything if you are just up front and tell them what is going on. With silence, however, people always assume the worst.

I am sure somebody will be doing tests of the TDI versus AQ and publishing results very early in this process, so waiting a short time may help settle it for you. I very much sympathize with your frustration. All the manufacturers generally irritate me to the point of serious distraction at times. Or should I just say they piss me off! I got so tired of heavy ergonomic disasters being foisted on us, that I sold my GPZ 7000 and Garrett ATX both in a fit of passive aggressive anger, and swore to never buy such heavy beasts ever again. I don’t care how well they actually work, these five, six and seven pound detectors have to go away and be replaced by lighter, more ergonomic designs with as much or more power. This long wait for the Fisher Impulse AQ has been particularly frustrating, since it offers so much that I have been waiting for. First Texas is without a doubt the slowest moving company in the industry.

They are the same circuit board in two different housings, and with the same coil should produce identical results. Coils do differ to some degree however, and this may be what he has experienced. The solution would be to use the exact same coil on both detectors by swapping it between the models. The chance of circuit board defects these days is rarer with surface mount technology and components, but not impossible. He also may simply believe it to be true... the placebo effect works with detectors. There is no point in arguing with some people and I generally do not bother to try and convince people of things they do not want to believe. If he has a G2+ and wants to believe it is better than an F19, no harm done. It is very important for some people to believe they have “the best” and trying to convince them otherwise is a waste of time.

I was talking nostalgic all time favorite, not what I have now or you should be pushing. My Gold Bug 2 got replaced by a Gold Monster which got replaced by a Goldmaster 24K. And if forced to pick between the 24K and Equinox for gold... I’d keep my Equinox. Why? I can do magical things with it I can’t do with other gold nugget detectors. 😉

I just ordered a similar item off Amazon for $46 so we will see if I can make it work.

Ah, gotcha. Yes, hunting in all metal or single tone does tend to simplify things. You are beach detecting much like I nugget hunt. Its more park hunting that some of us are thinking of, like me. In that instance I usually am hunting in 50 tones with the Equinox or V3i/DFX, and it is the 50 tones that produces the complex trashy type signal. When park detecting for rings, which is what I am doing normally, this usually aids with can slaw and other trash. I am never actually looking for chains... they are accidental finds. All metal or single tone would reduce or eliminate this 50 tone effect. Food for thought. In Hawaii beach detecting I hunt heavy surf and am hunting rings with a PI, and so as a rule I think I am missing chains. They must be there but I’m not finding them, even though I do well on the rings. Thanks Dave.