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Jonathan Porter

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Jonathan Porter last won the day on July 8

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About Jonathan Porter

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    Silver Contributor

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  • Location:
    Clermont, QLD, Australia
  • Gear Used:
    GPZ 7000, SDC 2300, GM 1000, EQX800

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  1. I'm more interested in the receive area of the coil, obviously with the larger coils less winds to the get inductance right equals quieter operation over high mineral ground, so a bigger coil will be less sensitive to near to coil variations (which is also an advantage) but in essence the size of the receive area, especially if that receive area is round in the case of Mono coils, provides a better outcome compared to odd shaped windings. The key is to get the very center of the receive winding over the target plume (that's the field created by the target that radiates out evenly all around and away gradually becoming equally weaker and weaker over distance). With the GPZ because of its dual receive its VERY important to keep those two receive windings in unison with each other, that means not tilting one receive winding into towards the ground (this will mean the other receive will be being pulled away from the ground at the same time) which can create varying degrees of saturation signal with the other side also potentially generating some degree of salt signal. JP
  2. Hi Steve, I've been away bush prospecting so have been out of the rat race for a while which was great, no hole is too deep when you have honesty, integrity and the truth on your side.πŸ˜‡ With the NOX you and I must have been mirroring each other across the divide, I was fortunate though because I only had to fucus on gold nuggets and not any of the coin and relic stuff which was extremely time consuming for you I'm sure. The NOX is a brilliant little detector thanks to your extensive input. Assuming I'm still welcome I'm back now and keen to start talking gold again.πŸ€” JP
  3. Yes sorry to have stolen your thunder Steve old chap! (not πŸ˜€ 😜 😝 ) I too am a NOX fan for gold hunting but like Steve hate the open webbed coils for prospecting. I suppose some resitance might be had because Minelab already have the Gold Monster fitting that category or it could be someone evil at Minelab HQ is determined to drive Steve mad!!🀣 I would love to see a Monster mode included in a future update for the NOX, the silent throshold makes the Monster great to use in ground a High Freq VLF has no business operating in. JP BTW Steve the weather was pushing Mid 40s Deg C when I was helping develop the Prospect mode, weather is no excuse!! LOL The mercury in the gold pan was nice and runny when I was testing, how bout you? 😎 πŸ˜‹πŸ˜‚
  4. Every time you shorten and extend the GPZ shaft the risk is there, like a time bomb waiting to go off. I have had a number of genuine lead ends fail over the past few years, one of them was my own personal coil (no damage to detector just the coil not connected warning then shutdown) That’s why they overmold the connector to prevent shorting out if something fails. JP
  5. In my GPX days I always used larger coils, either an 18” round monoloop or a 17” elliptical (after market of course). Because of this I traded off the small gold in the sub gram range. During testing of the GPZ I very quickly discovered the GPZ14 coil was easily out performing the 18” mono on my GPX with many deep nugget digs in the multi ounce range being checked and cross checked where the GPX was producing nill signal or minimal signals. As such the GPZ14 coil is now my go to coil for the GPZ and accordingly my small gold take has increased dramatically because the GPZ also shows a marked improvement on small gold compared to the GPX with small coils attached. The reason the GPZ14 hits the sweet spot is three fold, it has very good depth, its weight is OK and it produces a LOT less salt signal than the GPZ19! The thing about GPZ is it requires careful coil control to manifest deeper target responses, this is when β€˜any’ target is right on the edge of detection regardless of size, as such the weight of the GPZ, assuming you are rigging it up correctly, actually assists in the control needed to get DOD coils to create a recognisable signal by having a consistent range of motion over the target. I have found the X coils due to their lower weight relative to size can be quite beneficial, as an example the 17 β€œx 15” one I have used is very much akin to the old 18” monoloops I used to use on the GPX machines. It’s just a shame I cannot actively use the General Gold modes to take advantage of the extra thump on larger gold because of knock sensitivity. However is quieter soils High Yield goes OK. The X coils can have a more mono like signal response compared to a traditional wound DOD coil, that and the lighter weight and different size options explains why those reporting have been enjoying them so much, especially the smaller variants. The biggest fear is the patch lead failing and possibly bricking your machine, its an expensive exercise getting the GPZ fixed. JP
  6. I want two things, a super light weight PI not much heavier than an Equinox with a 10” elliptical coil, it has to have as good or better sensitivity as a SDC 2300. Then I want an as good or better than GPX 5000 PI in a CTX housing with a range of coils sizes from 10” elliptical right up to 18” round it also has to have a noise and salt cancelling coil that also performs reasonably well!! Lastly I want a GPZ in a CTX weight class with a range of coils from say 12” through to 20”, with the larger coil not exceeding the current weight of the GPZ 14” coil. 6 hours of battery life is plenty I can always carry a spare battery if this will help with weight. I will also need coil options that remove salt, saturation and EMI signals. I am willing to pay for said detectors because I am fortunate enough to live somewhere where I can find enough gold to do so, but for others I will also say they need to make budget versions of the above!! Especially the light weight small coil PI option. Minelab are you listening? JP PS this is liberating??
  7. Actually what I would really like is two GPZ’s, one on par weight wise as the CTX for larger coil use and another one that is super light for small coil use and yes with a 10 x 6” elliptical for Steve.??
  8. OK so what I would like is a GPZ at around the same weight as the CTX 3030. Believe it or not but a too light machine hunting for deep gold is actually a negative because coil control is so important, patch hunting or chasing small shallow gold no problem, but for deeper edge of detection responses it’s the other way around. So my bucket list would be (Bar if you like), A light weight simple to use Steve β€˜BAR’ PI with depth performance on par with GPX and sensitivity of the SDC with a variety of coil choices. A light as CTX 3030 GPZ 7000 with a variety of coil options, 12” small gold finder, 17” x 12” Patch hunter, 15’ round general purpose and say 18” to 19 β€œ same weight as the GPZ14” coil for outright depth. All units should have an option or ability to cut out EMI and Salt signals whilst maintaining reasonable depth and sensitivity. JP
  9. One question Steve and I hope I don’t come across contentious or conceited, what if β€˜your’ bucket list metal detector is a problem in the ground I operate in? You see I’ve used the Garrett ATX the Whites TDI and an early version QED in the areas I go detecting and test metal detectors in and found everything else seriously lacking. So is the bar performance based, price based or weight based? Minelab loses in weight and price but in my case wins hands down on being able to work in my ground and at the same time have performance. And sorry to be seeming like I’m dragging the discussion into contention but this also goes for the X coils where I work and test detectors. If I go over said ground with all of the above and find nothing with them but find heaps with the heaviest priciest detector in the list, which detector do I choose? Please I’m not trying to be walled eyed here, I’m not trying to be contenious or arrogant, this is not a Dodge versus Ford man beat your chest rant. There is no way I could bring myself to sell my Dodge ....... err GPZ. ? JP
  10. The GPZ remembers the Ferrite balance, so assuming the balance is correct relative to current temperature you can go too and fro between one Gold Mode or Ground Type Mode very easily. JP
  11. That looks to have be cut from the top of a GPZ14 coil and painted black.
  12. Suggested work around to keep yourself from going insane: Compress GPZ shafts fully. Undo coil adapter off control box. Rotate midshaft to line up with the groove and remove from upper control box shaft assembly with coil still attached. Once done you are no longer having to deal with the weight of the upper shaft and pod arrangement making it easier to rotate the coil lead whilst trying to get the lead through. Reverse whole process when reattaching the coil to the detector Hope this helps JP
  13. Look outside the box for a minute before casting judgment! I’m not trying to defend Minelab’s stance if it was just corporate greed we were talking about here, instead think about things logically for a bit before going down the ASS U & ME path! Firstly why did it take so long for the GPZ19 coil to come to market? I can tell you why because I was there and I know first hand how much effort went into getting it electronically right and also how many Engineers were involved. Minelab cannot just pop off and throw a few coils together like has been done with the X coils. As I have said in other posts the X coils are nowhere near consistent enough for Minelab to even consider them saleable from their standards point of view. It took MANY MANY hours of R&D to get the GPZ 19 coil up and running properly (weight issues aside), this meant people were taken away from other major projects to do this, because of electronic constraints/requirements the coil ended up being heavy. The GPZ has always been about depth on large gold that was what it was designed for right from the start, but it just so happens ZVT is also very good on the smaller gold which is more plentiful thanks to the inclusion of High Yield, which BTW was created much later in the development path due to the big gold not regularly coming to light during testing. Believe it or not Minelab are just as much in the dark about how much actual gold is out there in the ground as we are, so it was a wait and see approach on how well the GPZ actually did around the world. To develop a coil for the GPZ takes time and a lot of R&D dollars, but worse it requires man power which is the big bottle neck at Minelab due to so many different projects going on at once. Minelab are innovators, they spend the big bucks on R&D not rebadging and marketing the same old same old year after year! I feel people should be a little less critical of the way Minelab do things especially when you look at other metal detector manufacturers around the globe! As it stands even if Minelab were open to allowing acces to their dongles they would not currently allow the X coils to have them due to electronic inconsistencies. IMHO anyone making an aftermarket coil for the GPZ would have to lift their game considerably before gaining access to the dongle was ever an option. JP
  14. When using Quick Start the GPZ will reset to a fixed point set by software but every detector and coil combination is slightly different and also the temperature where you are operating will be different to were others are working. To reset the ferrite balance and Ground balance you need to select RESET ALL out of the two options, if you use Audio smoothing OFF you will need to go back into that menu option and reset as the default is Low, same goes for Threshold Pitch which is default 53. Finally if EMI is bad you will not be able to tell if the Ferrite balance is out unless it is WAY out as described above. Hope this helps JP
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