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Jonathan Porter

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Jonathan Porter last won the day on November 7

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About Jonathan Porter

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    Silver Member

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  • Location:
    Clermont, QLD, Australia
  • Gear Used:
    GPZ 7000

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  1. Getting Large Gold With The GPZ

    The key to remember on any deep target is the signal you are trying to capture is from the target itself and that can be incredibly weak. The deeper the target is the wider the signal can be which makes sense when you consider the target is now in effect a coil itself. Therefore the Tx of the target has to get wider and broader the further away the Rx of your coil is. You also need to imagine the targets field as being sphere like not 2 dimensional, at the very center the field is at its strongest, the further away you get the weaker it is, therefore the receive coil has to be almost dead center over the strongest part of the field (where the Coils Rx is at its most sensitive) to get the strongest response. If you then allow for the way a Super D coil manifests its signal it makes sense that a Slow Motion filter and a wide accurate sweep is required to generate a recognizable response, the key here is repeat-ability and accurate movement of the coil through the targets field. Can you get the response to repeat when careful controls are in place to prevent Saturation and Salt signals? Having a VERY low noise floor in combination with minimal self inflicted noise input is vital in this process. JP
  2. He was referring to the salt signal, once a coil size reaches the tipping point salt dominates the signal negating the depth advantage. JP
  3. Getting Large Gold With The GPZ

    I did a Treasure Talk Blog on the differences between the GPZ 14" and GPZ 19 and included a video on a nugget signal I found using the GPZ 19" coil. I got a fair bit of feedback from people commenting on the less defined signal response of the nugget, this is typical of large coil use with any detector. When a nugget is being sensed right at the very edge of detection the response is extremely swing dependent and requires VERY careful coil control to manifest a recognizable signal. Also key to the GPZ is the inbuilt SLOW motion filters and the ability to turn off the Audio Smoothing, anyone half serious about finding extreme depth nuggets will super glue that control on OFF no matter what!! Guess what gets worse with slow Motion filters and larger coils? You guessed it SALT! Guess what happens if you lift the GPZ 19" coil suddenly whilst detecting? You introduce varying degrees of salt signal! Guess what happens to an edge of detection deep target signal when you inadvertently introduce salt signal due to poor coil control? The target gets lost in the salt response. JP Apologies for the crazy eyed screen shot grab Minelab used for the video!!
  4. There's a key issue to think about when using larger coils which is mainly why you don't see Minelab going much above 19" and I notice no one has mentioned it here in all the dialogue. SALT JP
  5. Steve I strongly disagree. The issue here is two fold; Firstly big nuggets give off big signals, however thanks to the inverse square law, depth tapers off the deeper a target is which then gives a very narrow band of opportunity for the deeper punching machines to find the gold missed by others. Secondly because detectors have progressively become more and more sensitive over the years people tend to focus on the more productive target sizes and neglect the modes and coil sizes best suited for larger nuggets at depth and the skills required to capitalize on this. In the case of PI the first SD series were on about par with an increase in sensitivity and less holes in the timings, the SD2200D really benefited from having auto GB. GP series machines then benefited from having Dual Voltage which mainly gave an improvement in sensitivity on fast time constant targets but also a corresponding increase in ground noise negating the deeper signal ability if an operator wasn't careful. GPX detectors were basically extensions and improvements on Dual Voltage with the added advantage of "Smooth" timings which really opened up a range of nuggets still atreasonable depth's but hidden by mineralisation and the inability of DD coils to cope in Normal type timings. In the case of GPZ that's a whole new animal and to be honest I'm VERY surprised by your lack of faith in ZVT tech on large gold, I think this lack of faith comes down to too few opportunities to prove this out thanks to a lack of larger pieces still existing in the field but probably more important your skepticism in my opinion is down to Minelab failing to get the ZVT depth message to market effectively (I doubt if this is even possible). The juxtaposition is because the high frequency stuff stands out so resoundingly on ZVT, producing results for even average users, the real benefits on larger nuggets which take effort, patience and skill in the right areas are being neglected. The GPZ/ZVT tech thrashes PI resoundingly on big gold if your prepared to let go of the high frequency stuff for a bit and go chase the heavy gold. Steve I hope my comments are not offensive to you, I felt I needed to respond in kind to your level of skepticism. I'm not defending ZVT as a zealot, my strong opinion is based around my experiences with this technology and the many hours of depth testing I've performed. On big gold there is no equal to ZVT, it resoundingly thrashes PI. JP
  6. Johnathan Porter GPZ 7000 Dvd

    The big motivator in creating material is the need to share something your very passionate about, at the end of the day the money I made on productions only gave me a basic income and covered expenses. As time went by the motivator became impacted upon by all the negativity associated with the constant pirating and less than enjoyable interactions with total strangers who used to just walk up and bombard with critique/abuse, Steve can attest to on a couple of occasions like this when he was over here visiting with me. JP
  7. New Detectors And Early Adopters

    Ouch very embarrassing. But goes to Show how often we have these types of discussions. JP
  8. New Detectors And Early Adopters

    Its about time Steve.
  9. New Detectors And Early Adopters

    Argyle, sometimes our expectations can be out of whack with the manufacturers targeted end user which is why you hear rave reviews from some people and nothing but complaint from others. One thing I've learnt over the years is opinions are like backsides, everybody has one. From the manufactures point of view it comes down to how well the detector eventually sells, they too take a lot of risk which can get very expensive if they miss the mark. I'm an innovator according to Steve's chart and don't mind taking a gamble which is probably why I have a GS5b and a QED in my detector collection (I could never find a nugget with the GS5b but have found quite a few pieces with the QED). Gold has been very good to me so I don't mind investing some of that money into new products/toys that I'm pretty sure will not reach muster and will only ever get used occasionally even if they are half reasonable. Some I hang onto for nostalgia's sake others I move on. There are too many end users for manufacturers satisfy all of them fully, ultra experienced operators are even rarer so their needs and wants will never get fully addressed especially in the more generic models such as VLF. As a full time ultra passionate/perfectionist prospector my needs and wants are always at odds with the engineers during development on projects I'm involved in. I'm fortunate that the people I work with are very performance based so they give me a lot more air time than I probably deserve sometimes but at the end of the day there are always trade offs in the final product. JP
  10. X-Terra 70 & X-Terra 705 As Nugget Detectors?

    Targeting shallow low mineralised areas with the Xterra 705 was the key to having a bit of fun on gold with that machine. I get a little frustrated with the continual manufacturer bias towards DD coils on VLF detectors to try and tame mineralisation, don't get me wrong they are needed but they do limit things a lot when you need to whip the coil to get into the tiny surface gold. I like to run a VLF hot and prefer a concentric coil for the Zip Zip response they produce, then its just a matter of targeting shallow less mineralised areas where tiny nuggets are prolific and then go have some fun. If the detector is too noisy turn the volume down a bit first before you back off on the sensitivity, sensitivity reduction on a VLF blows the target signal really quickly. The key is to clearly hear the Zip Zip signals over the ground feedback. JP
  11. Ground Balancing The 7000

    The averaging is happening on two fronts, since the release of the GPZ 7000 there has been a number of updates so the software has changed a few times, subsequently the averaging is not quiet so important with the ferrite balance any more and basically redundant in Semi Auto mode (I highly recommend users operate in Semi Auto mode at all times). If you are in doubt about your ground balance then its not hard to power cycle the unit (turn off then on again) which flushes the algorithm except for the last known fixed point. Best bet is to pass the coil over the ferrite with the Quick Trak button held in till there is no noise, then pump the coil nearby till there is no noise in either direction (Up or down) then pass over the ferrite again. Keep doing this process till there is no noise heard on the ferrite after the GB has been normalized nearby. You can use the sweep method of ground balance too but I've found there is more accuracy if the coil is pumped once the Quick Trak button is released. The accuracy I seek is down to the auto GB being very slow due to the nature of DOD coils to prevent tracking out deep targets, sweeping gives an averaging, pumping givings accuracy immediately under the coil, I use the pumping method to bring the detector back to a defined point then let the averaging go from there as I sweep the coil looking for gold. DO NOT PUMP THE COIL OVER THE FERRITE, always sweep the coil over the ferrite. There is no advantage in having the ferrite near the coil whilst detecting. JP
  12. Steelphase Audio Enhancement System

    Steve you are correct. If the subject was just about the SP booster then I would not have commented unless I had something to input on the subject. Obviously people are going to make comparisons but I've been following a growing trend of commentators around the net (especially on FB) denigrating the B&Z to promote the SP, this I take exception to. Not to nit pick but I made reply to the OP because there was a comment about the audio of the B&Z using headphones so made some suggestions to forum readers and the OP to hopefully improve their headphone experiences and at the same time gave away one of my closely held secrets. I feel I have a right to have a say because the B&Z was directly mentioned in the post and I'm sure Jin would not take exception to this especially considering at that stage he had not actually used the SP yet. The other comments in my opinion were just mischief making, unfortunately I was then forced to spell things out. JP
  13. GPZ 7000 Audio Problems After Latest Update

    I'd say there's a component fault in the Pod or your WM12 is on the fritz, either way I'd say it needs to go back to Minelab.
  14. Steelphase Audio Enhancement System

    I won't mention the B&Z in any thread if others don't. BTW I don't sell the Bose headphones!
  15. Steelphase Audio Enhancement System

    The key to using the B&Z with headphones is to lower the detectors audio so you can lift the B&Z volume above 2 1/2. If you want an amazing experience with the B&Z booster with headphones then get yourself some of these. http:// https://www.bose.com.au/en_au/products/headphones/earphones/quietcomfort-20-acoustic-noise-cancelling-headphones.html#v=qc20_samsung_black If your working in and around trees they remove all the wind noise especially the low frequency stuff, they are also excellent at removing traffic noise etc.