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Jonathan Porter

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Everything posted by Jonathan Porter

  1. David I’m thrilled your book has finally been realised, I wish you every success but more importantly thanks for sharing with us your very interesting career. This forum has some truly diverse and fascinating people as its members. 😊 JP
  2. Sure you did. 😉 😂 😆 😝 Admit it your a detector collector tragic like the rest of us. 🧐 You’re going to have to become Durga to swing them all. 😂 Durga Born fully grown and beautiful, Durga presents a fierce menacing form to her enemies. She is usually depicted riding a lion and with 8 or 10 arms, each holding the special weapon (detector) of one of the gods (Minelab, Garrett etc), who gave them to her for her battle against the buffalo demon (The cupboard).
  3. So this isn’t a high end Minelab machine then Simon, thought you weren’t buying high end Minelab again? 😂
  4. @jasong I’ve tried to PM via the forum but it says you can’t receive messages .
  5. An honest write up of a TRUE field trip experience, kudos to the guys for doing so, in reality this will likely be borne out once there are more machines out in the field but its nice to see honest feedback before the brand battles start. One things for certain none of us can swing more than one detector at a time so strengths and weaknesses come to the fore when a decision is made about what machine you decide to swing. For depth I use the GPZ7000, it also runs nicer around EMI (in my areas) and has better ground handling ability, for lightweight fun and pinging the smaller gold I use the GPX6000 with either the standard coil or my new favourites the NF Xceed 12x7” or the NF 16x10”. I am not interested in depth on larger gold with the 6000 so do not operate it that way. Good post and even better clarification post from Steve elsewhere. JP
  6. OMG where the heck did you find that? 😂 I did those up for ML some years ago and put the crappy effects in as suggestion edits for their guys to then add their own edits and effects to the raw footage. I deliberately made it cheesy to have a go at their young marketing mutts who were kind of suggesting I was over the hill and now its bitten me in the bum and made it to the internet. Gosh that’ll teach me 😂 Steve will remember the time, it was just after Bill Stirling left and Detextspurts became a thing. I haven’t done anything for marketing since. 😂
  7. Hard to say, but I would definitely not recommend turning on the machine without tightening the coil connector first, those old connectors can be awfully loose in their sockets if they aren’t tightened up causing all sorts of weird behaviour. JP
  8. I’m over 6 foot and haven’t had an real issues with the 6000 but then again I have no issues with the GPZ either, not sure why that is. I have brothers who are taller than me yet my head hits the roof of their cars whereas theres don’t so maybe my longer back has something to do with it. The rose joint is a special swivel-like rod end design that allows a small amount or degree of movement in the stem end that in combination with the iso rubbers take the shock out of solid hits like large surface rocks and large pebbles. It creates a barrier to the direct connection feeling associated with the very light carbon fibre shafts and also soaks up some of the spring like movements that come from the larger impacts (Lower shaft wobble is reduced with the heavier coils because the Rose joint acts like a shock absorber). I think it is likely most noticeable in very flat Terrain where the coil is transiting an even sweep from side to side (often at a fast pace for coverage) with no plonking of the coil bottom like you do in hilly terrain, all those micro touches and larger ones in flat areas like WA can migrate to the handle and also the coil cable. Anyway its not a BIG deal more a refinement to the experience that can also have some benefits with micro bump cable noise etc. If your a fisherman its very much like the difference between monofilament (being the Rose joint) and Braid, monofilament has stretch and give and braid does not. JP
  9. Finally I got to see the Axiom actually being used in the “real”, thanks so much Steve for keeping it that way. That was fun. 😊
  10. I wasn't trying to disparage it Steve or criticise your feedback. With bigger coils like the GPX14 DD and the GPX17 there might be a difference, did you try those at all?
  11. Probably the biggest issue I can see is the loss of the Rose joint, Minelab put a lot of work into that lower shaft connection to take some of the shock out of small rock touches ect, carbon fibre migrates every little touch and clip right through to the handle this shock/movement can also get into the coil cable and the coil connector potentially creating unwanted noise. The Rose joint soak’s up a lot of side ways torsional twisting when the front of the coil comes into contact with something immovable, rather than put a big twist into the shaft (which acts like a torsion bar) it soaks up some of that energy like a shock absorber. The user experience is akin to running a dead dry chain on a push bike when you were a kid then oiling it, the difference was profound, assuming you were ever a BMX bandit as a 10 year old. 😊 Just my 2cents JP
  12. In the first video you can clearly hear the target is back from the trunk a bit so worth investigating. (I haven’t watched past the initial signal response). Logan could have had a bit better range of motion going over the target to try and establish the signal more but its hard to tell how awkward the area was to detect, he also should IMHO be using a Guide arm to get better coil control. Generally Range of Motion is the sum of the “lead in” and “tail out” from both directions then divided by 2 to help visualise the target centre (peak volume), usually lead in is half the distance of the tail out. As an example going from left to right the threshold pitch starts to change from the Threshold pitch change position (lead in point) to when it returns to threshold again the other side (tail out point) after passing the centre where the target volume peaks. The distance from no pitch change coming from the left to threshold again over to the right is the range of Motion, going back the other way from right to left the pitch will start to change much closer to the target centre (about half the distance of the tail out) then go beyond the left to right lead in point. A good approach with the tree roots is to go 90 degrees and listen that way, if its a tree root they generally get much quieter because you are detecting along the length of the root now and not at right angles passing over it. Assuming its the root your hearing and not up close to the trunk and assuming its not a cross your heart tree root (they sound very target like) The other thing to consider is the actual signal on tree root comes from the edge of the DOD coil not the receive line area, this then places the target response at the edge off the coil over the root and not half the width of the coil away where you are expecting it to be. Once you break through a tree root the signal will disappear but I don’t like to do this unless the tree is very healthy and well established.
  13. I don’t know what to say, to be honest as large as my ego is I honestly am crap at taking compliments. So I will say thank you for the kind words and scuttle away and hide for a bit. With regards to our sponsorship of Krissy, she well and truly deserves the support and in my own way I’m more than happy to do so regardless of her relationship status, anyone with her was welcomed to the arrangement. I have huge respect for any person doing the hard yards and sharing their lives for the whole world to see, it take guts and fortitude to do so. I see a lot of myself in what she is doing and I also see she is in possession of the grit that is required to have a go. Nothing but respect for her and what she has created, the little bit of involvement I’ve had to help her to continue to create what I consider to be “True” reality TV has been minimal relative to the work she is putting in. I could not imagine the pressure involved to continue to produce weekly content like that, all on her own out in the WA bush. Krissy is a star in my book and I’m glad to be able to help. JP
  14. https://en.m.wikipedia.org/wiki/Viscous_remanent_magnetization Bit of light reading for you Jen. In the case of the 7000 as described in my post above X can become an issue due to slight variations in ZVT, with slight differences in temperature, electronic differences or coil differences making it hard to calibrate at factory. PIs are not overly affected due to pulse not a constant Tx like ZVT but can still have issues in saturable places. Where VRM is extreme the G balance can compensate for some of it but not all. I’m no expert BTW and only have a basic understanding. https://www.minelab.com/__files/f/254716/KBA 24-1 Basics of the GPZ 7000 Technology Zero Voltage Transmission (ZVT).pdf This article is more focussed and relevant to ML detectors especially the comments about ground balancing and reactive soil component.
  15. There is a lot going on here, some of it I am sensitive to but am clueless to the cause and other parts I am just totally blind. I have gone back and added emoticons to my original tongue in cheek comments in the hopes this lightens the mood somewhat whilst still retaining the message and bring it more inline with how I originally intended it. I would like to acknowledge how appreciative I am of the words of support shown here by some of the very people I might have offended in my attempts at passing on knowledge through the filter of passion. I know I get it wrong a lot, I have a gift for words but sometimes the passion of my emotions creeps into those words and I blast right over the people I want to share that passion with. In this case I too strongly worded my thoughts because I was impassioned by what I felt was public ridicule over a VERY important (to me) process so I took the gloves off and gave back in the style the ridicule was delivered, I tried to be funny but I went too far. Way to far! I see that now. Once the passion had passed and I saw the reaction from people who I admire having to come to the defence of those who don’t have the gift of words I felt chagrined. 😔 Those people are highly experienced individuals who deserve my respect and at the very least, at the very least, deserve my making an attempt to word things in a way that is not all high and lofty. I would like to acknowledge the often silent readers of this forum who have a wealth of experience and success who do not post very often but to whom I often offend, to them I unreservedly apologise for not being more considerate. I have pondered the X balance/calibration subject more in the hopes of simplifying the message I want to deliver on its importance. The following is what I have come up with in the hopes we can move away from the subject being a location based thing and more a GPZ7000 ZVT thing. Stop thinking about X calibration in relation to what ground you are working or where in the world that is. Think of the Ferrite as a calibration tool that shows the GPZ7000 a reliable X signal no matter where in the world you are. Think of the control box temperature at the time of detecting as being the determinant for the X calibration. If the control box X calibration is inaccurate then the detector will make a signal on the Ferrite and any X signal in the ground, if present. If there is no signal or minimal signal on the Ferrite then the calibration is correct. If Semi-Auto or Manual mode is used the Calibration is locked good or bad. If Quick-Trak is triggered then the calibration is actively tracking X and G, a Ferrite should be present for best results. If using Auto mode the algorithm is actively trying to Track G and X from whatever signal is being presented to the coil, if salt/conductive signals or saturation signals are present they can confuse the algorithm. Lastly ZVT means Zero Voltage Transmission, this means the design requires Zero variation in the transmit voltage for the whole thing to work, however no electronics are perfect and no two coils are exactly the same hence the need for the user to calibrate. Each coil is slightly different so will require a slightly different Ferrite calibration, no two electronics are exactly the same also so the temperature of the electronics will ever so slightly change the calibration position from cold start to warm, as such ML cannot set a perfect calibration from the factory so the end user is required to perform that task for maximum performance, either through the use of Quick-Trak and Auto mode and the octopus wiggle recommended method or the same method in combination with the Ferrite, or Semi-Auto and the use of the Ferrite (my personal recommendation). Hope this goes some way to explaining my position and also make amends for some of the misunderstandings. JP
  16. I’m sorry if I came across all worked up, that was not my intention. I was however trying to get across the importance of using the Ferrite especially for GPZ users who want to get the absolute best out of their investment. Words are hard things to put together especially when talking about technical things and more especially when one word can be used to describe a multitude of subjects. This becomes even more complex when there is a cultural divide where phrases can have different meanings. My attempt at mirroring the tongue in cheek approach of the OP whilst attempting to impart information has clearly fallen flat.
  17. Steve did I quote you at any stage? I’m not telling you to do anything, mandatory or otherwise. I am also not telling you about your personal experiences only my own, which in the case of the US was extremely limited.
  18. A lot of the X coils will not Ferrite balance properly especially in Normal timings, the best ones I used were the 15” Concentric’s they weren’t too bad, although a friend of mine has told me his recent 17”CC coil is very good too. The reefy country will most likely be saturation signal being magnified up the centre of the Ferrite, use the in-air approach assuming the coil and timings you select will allow it. The GPZ14 coil should be able to ferrite balance in all timings (it is OK to have some small amount of signal but a loud target-like one is not good). If you can achieve a reasonable X balance then I highly recommend you use the Semi-Auto GB mode, once locked the X calibration cannot shift unless the temperature of the electronics shift a lot (can only shift a few % points from dead cold), however if using Auto in some ground types you will only need to walk 20 meters in Auto and the conductive and saturation signals can throw the Calibration right out, this then has a flow on effect with the G balance which then tries its hardest to compensate but WILL fail. In the conductive areas in the US (Nevada etc) the X signal is probably minimal and the Alkali the worst so the Auto mode should not be too badly affected by a bad X balance, best way to check is to pass the coil over a ferrite occasionally and see how loud the signal is, personally even though there is not much X present I would still be using Semi-Auto if for no other reason than it might give me a slight advantage over other operators. My experiences in Arizona showed me there was plenty of X signal to be had in and around the Bradshaw mountains, even up at Rich hill there was plenty of ground that was variable (this was in the days before Smooth, GP3000 from memory) and I’m sure there would be plenty of X signal around. Mineralisation that forms gold that is then weathered has all the elements that can affect a metal detector no matter where in the world we work, if it didn’t then Americans would still be using VLF machines there would be no point to a PI. Case in point the new Garrett Axiom, obviously there is still a need for a PI in the US. JP
  19. PI isn’t affected the same but a lot of saturation signal comes from high X ground, this is especially noticeable with the Flat wound coils, they see a LOT of X. Hence why I tell people to not scrub the coil in highly mineralised soils/gravels etc. X signal is no joke on the 7000 so I’m surprised by all the head in the sand humour surrounding it’s use on here 😁. Yeah I get the humour, Octopus dance, Ferrit, ritualised activities around the fragile yellow round thing etc,🤣 but in reality it is an important aspect to ZVT and should be taken very seriously.🤗 Just because you don’t understand its use or can’t see the benefits doesn’t mean you should not use it and instead become part of the Anti-Ferriters,🙃 there is another very hot topic raging around the world as we speak that follows a similar vein. Just because a LOT of people agree with you does not make it correct. 🤭 Use it, don’t use, get Ferrited or be a vocal Anti-Ferriter that’s your choice,😁 hey better yet buy a 6000 or an Axiom then you don’t have to do the Octopus dance of zero comprehension!!😁 I’m amazed after all this time that there are still people out there who refuse to inoculate with the Ferrite,😄 I honestly thought that discussion had been put to bed. Just like that hot world topic there are plenty of people who aren’t Ferrited who do perfectly fine without all the hoopla of the ritual of the “Yellow Lord of the Rings” 🤣 so at the end of the day its your choice, just please don’t deride what you don’t understand.😋 JP
  20. What coil do you have on your machine? In some ground where there is a bit of saturation signal the round ferrite will channel that signal up itself magnifying it, this can sound like the Ferrite isn’t being balanced out but in fact it’s saturation signal, you cannot ground balance out saturation. Best bet is to place the ferrite on top of a big rock (4 inches or so high) or put your ferrite on a stick and hold the coil away from the ground waving the ferrite under the coil over the windings till the noise goes (with QT depressed of course), then bring the coil to the ground and slowly pump the coil till the Semi-Auto GB balances out the ground signal. (The GB for the ground will be out because when the coil is held in air you are balancing to nothing as you calibrate to the ferrite). If there is only a small signal off the ferrite don’t worry about it, the key is to not have a LOUD target like signal on the Ferrite. General ground noise will cover any mild signals especially when using Normal. The Most sensitive mode on the 7000 to the ferrite is High Yield Normal.
  21. If you have no Ferrite then do the octopus dance in Auto with the QT button held in then go to Semi-Auto to lock the calibration on whatever the detector has come up with. In low X ground it’s obviously not a big deal but sometimes that is a hard thing to do. In some cases a very poor X calibration can sound like rapid fire EMI as the coil is moved, it introduces noise to the audio that does not need to be there, I personally prefer no noise of any kind from any source that can be removed through a simple action.
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