Steve Herschbach

It's been available since day one - read the three posts I made here:

I jumped to Garrett with the 24K and Axiom and declined an invitation to sign a new NDA with Minelab as I did not want to risk any possible appearance of impropriety. I've wrapped up work on the Axiom obviously and at this point content with where we are in detector technology given where I started 50 years ago. Long story short I've not had any contact with anyone at Minelab in over a year. It's not something I am all anxious about one way or the other as my big nugget hunting days are behind me. I have little interest in anything other than a detector that gets a solid 20% more depth than what we have now, and that's not going to happen.

Start video at 2:40 mark

We had a couple corrupt index tables that have now been cleared. Should be fixed now though some items like Activity Streams or notification lists may need to rebuild. I'll be honest with you guys sometimes I feel like I'm just keeping it running with duct tape and bailing wire and hope the whole thing does not blow up at some point.

Either will get the job done, personal preference thing more than either being an absolute provable "best." I lean Equinox myself due to larger available coil selection and versatility, but would not argue with anyone who'd rather use the ORX for nugget detecting.

Well, just the 11" coil but if that's all I had I'd be seriously irritated. As it is the reason I got the detector was the 5x8 coil finally being available, so I got both at the same time. The 11" coil worked for two seconds, then gave a Coil Disconnected Shutting Down error. Disconnected and reconnected several times same result. 5x8 coil works fine. Did the software update with the 5x8 coil and did a reset. 11" coil still acting like it is not connected, 5x8 coil working fine. Probably a bad chip in the coil. Luckily I had the spare coil or I'd not know if it was the coil or the detector. I just sent an email to Minelab Service 3:30pm today so I will update with how the process goes with getting the coil replaced.

Finally, at least some of the GPZ comparative testing was done in a test pit as shown in this video starting at the two minute mark. Anyway, there is all I know on that subject, people can draw their own conclusions and judge this all on what time has revealed as fact in the field. I guess I am way too jaded from my years in sales to see anything but the words "up to" and so I know what I am seeing in the field clearly fits into at least that category. In fact I can say I have seen performance from my GPZ on the order of several hundred percent better than a GPX on certain specimen gold. Others no doubt feel otherwise.

From Basics Of GPZ 7000 Technology: Zero Voltage Technology (ZVT) page 3 Performance advantage of the GPZ 7000 To measure the performance of any detector depends on many factors, such as: particular detector settings, coil size and configuration, ground type, mineralisation levels and type, electromagnetic interference, gold nugget size and composition, and of course, operator skill. Figure 3 shows the percentage increase in depth of a GPZ 7000 compared to the GPX 5000, using the same sized coils (14‐inch). This data was obtained at several different soil locations and conditions in Australia. For these measurements: • A GPX 5000 using a Monoloop with Fine/Enhance timings is used when testing in (highly) mineralised soils. • A GPX 5000 using a Double‐D with either Normal or Sharp, whichever gives the best depth for each nugget tested (referred to as ‘GPX 5000 Normal’), is compared to the GPZ 7000 Difficult + General in moderately mineralised soils. • The GPZ 7000 General is compared to the GPX 5000 Sharp or Normal (again referred to as ‘GPX 5000 Normal’) using a monoloop in moderately mineralised soils. Here the vertical Y‐axis is the percent advantage, and the horizontal X‐axis from left to right, is for a steadily decreasing mass of the nugget tested, going from number 1 being for a 20 ounce nugget, to number 30 for a 0.13 gram nugget. The X‐axis is not drawn to any scale, merely listing nuggets that were available for testing in decreasing weight order. The depth advantages of nugget numbers above 30, (30–35 being between 0.13 and 0.05g) are off scale; above 60%, and thus not shown on this graph. The reason why the data is so scattered is because the two different technologies respond differently to how fast the eddy currents change; due to different Time Constants (TC). The Time Constants vary considerably between nuggets even if they have the same mass; that is, whilst the X‐axis list decreasing nugget mass, this does not necessarily correspond to continually decreasing Time Constant. As can be seen, the depth advantage varies considerably from nugget to nugget, and setting to setting, but the general advantage of ZVT is clear; mostly distributed between 0–40% improvement, and even more.

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