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PhaseTech

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Posts posted by PhaseTech

  1. On 12/2/2017 at 3:37 PM, goldenoldie said:

    Actually just found this video test between a GPZ and GPX on an undug target using larger coils.

     Hopefully Nenad does not mind me posting his test here on this forum and subject.

    There appears to be very little difference between both the GPX and GPZ on this target.

    Share away no probs. 

    The big difference is that the GPZ in Normal with a slightly lower sensitivity could easily be run in that ground. The GPX would need the Sensitivity dropped to minimum, and you'd need to have good tolerance to noise. If I had a time machine, I would love to go back and try a big DD on the GPX. 

    • Like 1
  2. On 12/3/2017 at 4:17 AM, Steve Herschbach said:

    “Sharp is similar to Normal but creates a more powerful detection field. It is capable of an improvement in depth, but is more susceptible to interference and will increase the severity of false signals in difficult grounds. This timing is best used in quiet conditions and can work well in combination with Deep Search Mode with a reduced Rx Gain setting. Sharp is an excellent tool for pinpointing faint signals due to the very "sharp" signal response. Sharp will work best with DD coils in most gold field locations.”

     

    Have a guess who wrote that? :rolleyes:

    • Like 2
  3. On 12/1/2017 at 12:34 PM, Jin said:

    The thing I wanted to know was am I wasting my time detecting areas that were known for deep gold as newer detectors aren't really punching any deeper than the older ones, (sd2000) especially the detectors that were made or modified to get around the government emission laws. I think Reg has answered my question.

    Of course, there's the chance in those areas nobody got it all, but I think my time is better spent in areas of less attention as I just haven't had much success in the flogged areas running a large coil.

    Last week I was in the exact spot that the prototypes found good gold. Detected all around that immediate area for nothing. Got me thinking maybe there's no gold left, maybe my detecting skills are poor or maybe this gpz4500 just doesn't go as deep as their detectors did. When you don't have years of experience under your belt all you can do is ask, hence the reason for the original post. 

    Jin, it can be a bit of a combination of factors which vary between spots. 

    The 4500 is well up to the task to find big deep lumps, it's just that people don't really set them up to target big gold. 

    In milder/medium mineralisation I'd be using the biggest DD you can get your hands on and Sharp timing.

    In hotter soils I'd be using Enhance and a big mono, 19" Evo or 20" NFA or 22" Gold Stalker. 

    • Like 4
  4. On 11/7/2017 at 8:25 AM, Isca_Detecting said:

    Are these MarsMD coils any good?

    My Impact stock coil cable failed on me this week which is very disappointing when the cable is protected in the shaft. I think it's been like that for a while because the machine would go silent and then come back. 

    It's still a brilliant machine and I wouldn't swap it for anything but I need the coil replacing.  

    Make sure the cable connection inside the shaft is nice and snug. Mine lost audio, then I noticed Check Coil message on the screen. Tighten up the connection and all good. 

    • Like 1
  5. Always interested to read your opinions on this Steve, so thanks for keeping it updated. As far as I know the GPX4800 has been discontinued. http://www.minelab.com/customer-care/product-notices/discontinued-products/gpx-4800

    Also, any reason why the Au Gold Finder isn't on the list? It's about as dedicated prospecting machine as they come. It's like a modern day hybrid of the Gold Bug 2 and Gold Racer. 

  6. I do use pin-pointers when it is a deep target, particularly in hard ground, where you really don't want to open it up too much. Saves a tonne of time! 

    Pin-pointers simply don't have the sensitivity to small targets like a gold detector does, so trying to find a tiny target with a pin-pointer is pretty tricky. Much quicker using a scoop. 

    • Like 4
  7. Detech's largest flat/spiral wound mono is a 14". There is an 18" round and 18" elliptical in the product line-up but these are both a traditional wound coil. I haven't used both side by side, but I'd say the 18' Elite would have more sensitivity to small gold, but the Detech would likely run quieter in high mineralisation (due to less near-coil sensitivity). 

    Detech have a new 15" round coming out which will be interesting to see how it compares to the current 14" Ultra, as well as the 15" Evo which is a brilliant coil.  

     

    • Like 2
  8. I've found the deeper targets are barely a pull in the threshold, and some of the responses are quite wide, so you need to do a slow wide sweep of the coil in order to hear the full rise and fall (or the opposite) of the signal. With a short narrow sweep, the target can be invisible. 

    • Like 1
  9. Steve, what did you do regards ground balance? Did you ground balance off to one side of your target pad then run in fixed? 

    Did you try tracking on any of the units to compare with the monster? 

    On seeing your targets laid out like that, the first thing that crossed my mind would be to cover it with some particle board, and then put other users to the test where they can mark on the board what they think is a good target vs bad target. That would be a very good way of learning ones detector of choice. 

    • Like 1
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