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Jonathan Porter

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Jonathan Porter last won the day on November 7 2017

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About Jonathan Porter

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

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  1. Jonathan Porter

    Recent Find With GPZ 19 Coil

    Found this past weekend with the GPZ 19 coil at 2 measured feet. JP 20 grams
  2. Jonathan Porter

    Another Question About The Ferrite Ring

    Ferrite balancing is a "Calibration", the detector could care less where it gets its "X" excitation from but IMO using the supplied Ferrite is more accurate than having a random potentially inaccurate reading from the ground. The Ferrite "Calibration" will remain constant if the localised detecting conditions remain the same relative to ambient temperature and the temperature of the electronics, it has nothing to do with the ground except for aquiring an X balance either through having no Ferrite or if the X signal in the ground is different to the Calibration setting potentially causing spurious signals. If there is no X signal in the ground your working then the calibration of the detector is not so important, however there can be a lot of X signal in ground with minimal mineralsation so it is hard to tell by eye when it is present or not. Best bet in my opinion is to always "Calibrate" the detector with the Ferrite, use in Semi-Auto mode and check the Ferrite periodically, especially if Ambient temps fluctuate a lot. Hope this helps JP
  3. Jonathan Porter

    GPZ 7000 Auto, Semi Auto, Manual ???

    The Ferrite is needed to accurately calibrate the detector, the ground holds varying degrees of Ferrite like signals called X. In Auto mode the detector will slowly measure any X component in the ground but can be adversely affected by Salt and Saturation signals. If there is no Ferrite available then the detector can be used in Auto mode and hopefully the ground conditions will allow for a reasonable X measurement. When Quick-Trak is triggered the X balance and G balance track really quickly then throttle back to their respective speeds, in the case of Auto mode the X balance is really slow with an active G balance when Quick-Trak is released. In Semi Auto mode the X balance is FIXED once the Quick-Trak button is released. If you do not have a Ferrite then with Quick-Trak engaged used the "Walk and Detect" method shown in the Minelab YouTube tutorials. Ideally it is better to use the Ferrite at all times using Quick-Trak in Auto, Semi Auto or Manual mode. Using the Ferrite is far more accurate than solely relying on there being enough X signal in the ground. Hope this helps JP
  4. Jonathan Porter

    GPZ 7000 Auto, Semi Auto, Manual ???

    Combination of orientation and balancing it out. Fix the GB to Manual mode before committing to dig. Use the Semi Auto mode during detecting to keep the GB simple. Make sure the Audio Smoothing is OFF!! Lower the Sensitivity and Volume to suitable levels when using Audio Smoothing OFF, threshold needs to be 27 at this level. Hope this helps JP
  5. Jonathan Porter

    GPZ 7000 Auto, Semi Auto, Manual ???

    Couple of things that need to be thought about with any auto GB but more so with the GPZ. An edge of detection target will present itself to the detectors electronics as potential ground noise so the Auto GB is going to mess with it somewhat, this is why I always move away from a potential signal response onto clean ground, center the GB under the coil, and then get the GB averaged again by carefully sweeping before moving slowly back in over the target zone. In the case of the GPZ and why you should use Semi-Auto GB over Manual (I'll discuss the differences between Auto and Semi-auto below), the GPZ has a dual receive coil design (super D or DOD as some like to call it), this coil design is difficult to make because the two receive windings have to be kept in phase, you the operator can easily throw the coil out of phase through poor coil control. Out of Phase means that one receive winding is generating a different response compared to the other. If you are working variable ground where the GB is very active the interchange between different GB scenarios can cause a tonal break in the threshold as one winding passes into the new GB scenario while the other receive winding is still in the old scenario, this interchange is heralded by a target like signal response which usually the Semi-Auto GB quickly deals with. If you are using anything less the Audio Smoothing OFF then you will generally not hear these small interchange responses as the filtering masks them along with faint edge of detection tonal target responses. If you use Manual GB those interchanges will sound very target like forcing the operator to either check them out or if the ground is really variable ignore them through attrition! Either way your technically blind while the interchange signal is in effect, using Manual the interchange response is much more aggressive and longer in duration forcing a compromised on what targets are investigated, effectively leaving quite a large amount of undetected ground. A thing to note, quite a lot of nugget signals are nested in those interchanges of mineralisation. The nugget in the FB video sounded like a broad very faint variable tonal response but experience has taught me to check these types of signals out, because I was originally in Semi-Auto GB the target response between the High/Low Low/High channels was interfering with the response, this caused the Lead In and Tail Out of the target to be extremely wide as the two channels fought each other, especially on the Tail Out (the only way I can describe this type of signal response effect is when two magnets are moved near each other with like poles, they repel each other). Setting the GB to Manual on similar ground nearby brought the target response more into the Low/High range focus allowing me to centralize the response and confirm it was indeed an edge of detection target. In this case the target turned into a deep 6 gram slug. 6 gram Nugget Dig Differences between Auto & Semi-Auto: Auto GB on the GPZ 7000 is doing 2 things at once, it is actively tracking the ground and at the same time is very slowly tracking any Ferrite like signals in the ground. Semi-Auto is only actively tracking the ground with the Ferrite balance being fixed. I do not like to use Auto in the majority of ground types in Australia as we have a lot of ground conditions that interfere with the active Ferrite balance, one is Salt and the other is Saturation. If you follow the normal Ferrite balance procedure in Auto mode and then encounter salty or saturable ground the Ferrite balance will drift away from optimum allowing Ferrite signals into the signal response (assuming there are Ferrite like signals there). These signals add to the threshold and ground noise potentially masking targets or in a worse case scenario sound like target signals that disappear. Semi Auto locks the Ferrite balance, so when you use the Quick-Trak button over the Ferrite the detector is actively looking for Ferrite like signals and trying to track them out (triggering the Quick Track button in any GB mode does this), when you release the button the detector locks the Ferrite balance so the only way any Ferrite like noise can get into the signal train is either through temperature changes or not having preformed a good Ferrite Balance in the first place. Hope this helps JP
  6. Ash I've deliberately avoided this thread because of it being contentious and yet my name got dragged into the discussion anyway. Not really sure where your angling with your comments but I will now give my opinion so there can be no confusion on where I stand on the subject of mods. The SD 2000 benefited from two mods, one was an increase in battery voltage which helped increase somewhat the coil field strength and the other was a crystal change which improved the sensitivity to small targets. The crystal mod was not so useful on the SD2100, but both the SD2100 and SD2200D did get some benefit from running a higher voltage. The higher voltages on the SD units did improve target response however they also increased ground noise so then forced operators to use DD coils in variable ground which then had a corresponding reduction in depth compared to a Monoloop. Battery voltage increases on GP and GPX machines is no advantage due to the dual voltage technology, in essence the voltages of DVT are adjusted internally regardless of the input voltage however there is some evidence the audio is "brightened" by running a higher voltage on the GP series (highly speculative, and only really noticeable if the Minelab battery is low on charge). I am unfamiliar with the current mods other than experience with customers in our shop and Minelab's stance on modded units when it comes to repair work etc. If a detector comes into Minelab with mods the repair center just closes up the unit and returns it to the sender. Last year I had a customer who I've known for many years come into our shop to say Hi and talk gold, in the discussion he very enthusiastically told me about his modded GPX 4500 and how he felt it could beat a GPZ 7000 on all target sizes which was supposedly demonstrated to him on a test bed in Victoria, we had an interesting discussion where I put forward my case on mods and the differences in the different technologies etc (I had to do this very tactfully because he is a friend and a customer so I did not want to offend). This was not a heated debate, he is also not broke so could in this case afford to take the risk if the unit failed etc. Two days later he came back into the shop and bought a brand new GPX 4500, his modded unit although brilliant in his opinion on the test bed where he had seen it perform on known targets was next to useless in the real world where you don't know if a target is actually present or not. This is the sum total of my experiences with modified Minelab metal detectors, I have expressed my opinion in the past to try and put balance to discussions to help inform people like my friend above, especially those who cannot afford to have a detector become unusable, in almost all cases the discussions became personal to the extreme with suggestions about my Minelab bias etc. These days I just can't be bothered getting into all the debates. I won't be responding further on this discussion. JP
  7. Jonathan Porter

    Equinox Acting Crazy

    As mentioned I would try the frequency option, in Prospect mode there's only two, 20kHz and 40kHz. Also go into the GB mode and check to make sure the Ground Balance is accurate, best way to confirm is to have the GB in Auto then hold in accept reject then when you hear the little peep sound wave the coil side to side not up and down. If there is salt present pumping the coil will cause bad GB numbers which will make the detector extremely noisy to use, a side to side GB method makes sure the ground balance is correct for the ground and not trying to set itself to the salt signal. It is possible to have areas with low mineralisation that have high salt signals. Also the recovery mode is tied in with salt as well, the higher the recovery the greater the rejection of salt, lower numbers bring the salt signal in much stronger, in my areas with low mineralisation (can run the sensitivity on 20) where salt has been a problem I've found a recovery speed of 4 to be ideal. Hope this helps JP
  8. Jonathan Porter

    General Vs High Yield

    All the Gold Modes behave differently to each other on targets, this is due to the 2 channels having cross over points where the target response is a blend of High/Low and Low/High all at the same time. This "confused" type signal can make the audio sound muted compared to a dedicated one way signal in another mode, tricking the operator into thinking the target was louder in one mode over another. This is why it pays to go over patches in a range of modes to allow for each mode to respond best on any targets that were not so obvious in the mode used previously. The GPZ has a larger "range" of information available compared to previous PI machines, call it resolution if you like, which means each and every target is more individual in the way ZVT responds. JP
  9. Jonathan Porter

    2 Wm 12's

    You need to think of them as the Master and the Slave (Is it politically correct to use that terminology these days?), the Master is connected as per usual and the Slave is connected to the Master. The Slave won't work without the Master present. JP
  10. Jonathan Porter


    Based on what your saying I would recommend you stick with your Gold Monster until you can get your 4500 or even an SDC if the gold in your area tends to be small. On the other hand if you want a detector that has a foot firmly in both camps then the Equinox 800 is an excellent choice. Notice how I said 'choice' and not 'compromise' because with the Equinox compromise is no longer a word associated with the abilities of this detector on either side of the spectrum, it actually has near zero compromise between the Coin and Relic modes and the Prospect mode compared to other dedicated VLF style detectors. Even the Equinox 600 has excellent gold finding abilities using Multi-IQ with some of the modes on offer. See Steve's recent Treasure Talk article for more info at https://www.minelab.com/anz/go-minelabbing/treasure-talk/equinox-600-vs-equinox-800
  11. Jonathan Porter


    In some ways I wish we weren't spoiled for choice with GPZ and SDC options, I could really go for Multi-IQ if I went back to a time of VLF only where the world seemed so much bigger! Since MPS/MPF and ZVT the Goldfields seem tiny somehow, you tend to gobble up so much country using them. I now need a million times more available space with ground ignoring type of detectors whereas with the EQX I've spent many happy hours wandering around an acre of ground getting to know every little bump and rock. JP
  12. Jonathan Porter

    Jonathan Porter Talks Equinox And Gold Nuggets

    There are a few things that I love about both detectors, the GM is designed for ease of use and does that job brilliantly with the ability for more aggressive sensitivity if required. Probably the 2 best things I love about the GM is the solid coils and the Auto Sensitivity, I'm not a real fan of zero threshold but it does allow the GM to be used in some pretty terrible ground. That ability is a compromise though because the zero threshold is acting like a filter essentially filtering out good info which then harks me back to the auto sensitivity+ aspect of the GM 1000 which does an amazing job behind the scenes. Equinox goes about things in manner I love, pure horsepower with full control for the driver if they dare. There is however a side to the Equinox that is unique and to be honest is hard to nail down. Multi-IQ is hard to describe, the only way I can really analogize it is to say its kind of like digital audio compared to analogue audio, there is a smoothness to Multi-IQ that is very Analogue like to the ear, a rounding or evening out, kind of like someone filling in all the gaps to smooth out the ride. Because of that behavior I can then step into a horsepower mindset with the EQ800 that is simply fascinating. Please keep in mind I am comparing apples with apples, the EQ is in no way a MPS or ZVT beater. It has it place with high frequency VLF type detectors and should only be compared to them, especially in variable mineralised ground. In the right locations the EQ800 and GM1000 are good fun and will find tiny pickers the other techs just will not see, learn to target those locations and you have the gold that's available all to yourself. The key is selecting the right locations and using the units where they perform best. JP
  13. Jonathan Porter

    Jonathan Porter Talks Equinox And Gold Nuggets

    What's been made redundant? Maybe the Xterra, definitely not the GM. I love the Equinox because it is so versatile, it ticks a lot of boxes for me, but I still own my GM 1000 and have no plans to sell it any time soon, it's too good a machine to get rid of it. JP
  14. Jonathan Porter

    Gold Monster 1000 Vs Equinox 800

    I love the target ID numbers on the Equinox, there is also a horsepower rawness to the 800 when in Gold Mode that I prefer over the simplicity of the Gold Monster. My son who has had no real experience with VLF type detectors preferred the Gold Monster thanks to the less complex feedback "switch on and go" detect type approach. If the ground becomes too variable both units will start to struggle requiring the operator to back off on the sensitivity, in hot variable ground that is the only way to deal with mineralisation on this type of detector. Reducing sensitivity reduces depth in a rapidly sliding scale, in those situations the rapidly sliding scale goes the other way for MPS, ZVT style detectors, so just like in real estate, Location, Location, Location. JP
  15. Jonathan Porter

    Giving Credit Where Credit Is Due

    I'm a dealer and at no stage have Minelab told me I would have stock in January. As frustrating as it is fielding constant questions about Equinox I look at each and every inquiry as a contact point with my regular customer base but also an opportunity to make contact with potential new customers. It is better to have the phones and emails running hot than be sitting in a quiet shop during the off season (obviously things would be different the other side of the equator except for those dealers further north who are snow bound). I'm not trying to defend Minelab just state the facts, at no stage have Minelab told me I would have stock before this past week. I too am seeing people across the globe un-boxing and enjoying their new toys while my customers are asking "when's mine arriving", knowing that I will only have a limited supply from the first batch when they finally do arrive. At the end of the day it is what it is and all I can do is be patient, to my mind how I deal with customer inquiries at this stage is just good investment in any future dealings I have with them. BTW We are still waiting on stock. JP