Gidday All,
I have just uploaded a youtube clip of testing I did this morning of the GPZ14 vs the QED with N/F 17x11 coil. ( see below )
The nuggets in ground were 3 of the ones that I found last week with the GPZ19.
Narrow holes were drilled vertically into the ground using 10mm round bar hammered into the ground to depths of 3, 5 and 7 inches. This provides minimal disruption to the surrounding ground mineralisation and is about as real a test as you can get with " planted " nuggets. These nuggets are a bit rough and gnarly, so not as solid as some, and maybe the QED does not work well with this sort of nugget ? The nuggets were dropped into the holes, the 4.5 grammer had to go in on end, so its not lying flat.
What was apparent from the tests is that the ZED is a powerful beast. Gain was at 14, H/Y normal, no smoothing. This is state forest that I have found many ounces of gold at with GPX4000, GPX4500, GPX5000, SDC and GPZ, so a real goldfield. The ground here is mineralised and variable, and normal mode whinges a bit but is very usable.
QED mode was 5, which was the lowest I could achieve good ground balance on.
What was apparent was that at gain of 1, not one of the targets could be heard, and not until the gain was set to 5 did I even get a peep out of any of them, except air testing over my 0.3g test ball.
At a gain of 10 it got all the targets, but that is cranked to the max, and in real world prospecting you may not be able to run a gain of anywhere near 10.
The QED has a weak audio, which can benefit from a good booster, like the SP01 by SteelPhase that I use. It is fiddly to use, having to change your mode and bias ( and thus ground balance ) every time you change a coil. It is light and at about a fifth of the price of a GPZ it is good value, but I reiterate my earlier statements that if you are hitting ground that has been PROPERLY done by Minelabs, you ARE wasting your time !
No doubt I will get plenty of hate mail from the QED lovers such as Doug, but at the end of the day, all I care about is real world performance on all types of nuggets, and I'm afraid that the QED doesn't cut the mustard in this regard. Someone else stated that it is good for crumbing with tiny coils, or a low cost patch hunter in more virgin areas, and I agree with that summation.
Rick
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https://youtu.be/EiryvV-uZKg[/video]