Sourdough Scott Posted October 10, 2015 Share Posted October 10, 2015 I too have encountered areas here in the Northern Sierras that I could not get the GPZ 7000 to quiet down. I'm guessing the rocks were andesite. They were positive and negative hot rocks. You could somewhat tune a positive rock out, but the negative would still sound off. And vice versa. And basalt is the same. I would put it in difficult, lower the sensitivity, high smoothing, to no avail. Even in severe it was sounding off. But this was in only a few areas. Near some of my proven patches. 99 percent of the time I could run quiet in normal and Difficult. 2 Link to comment Share on other sites More sharing options...
Steve Herschbach Posted October 10, 2015 Share Posted October 10, 2015 Yup, andesites and basalts plus moaning/groaning in the alkali. Yet nowhere so far in my experience to be more than an annoyance. The rocks tend to be surface or very shallow (though not always!) and the alkali areas I have done quite well in by just slowing way down. The alkali issue could be solved two ways. One would be to just allow the machine to ground balance fully into the conductive salt range. The downside is just like with any beach detector eliminating the salt signal reduces or even eliminates signals from certain gold targets. But it gives you quiet stable operation in return. A variable motion or SAT control would help also. It is obvious that slowing down allows the GPZ to better keep up with and adjust for the salt signal. Increasing the self adjusting threshold retune rate would allow for faster col movements with less noise. Again, a trade made in faint (small shallow or large deep) target responses being sacrificed. I am taking a bit of a purist approach with the GPZ myself. I know for a fact that eliminating the salt signal and even all hot rock signals takes with it certain gold targets. So long as the number or intensity of such signals does not become truly overwhelming I prefer to just deal with it by digging a few rocks or manipulating the audio responses (in the case of alkali) and retain that edge I feel I have running the machine extremely hot. 1 Link to comment Share on other sites More sharing options...
1515Art Posted October 10, 2015 Share Posted October 10, 2015 Yup, andesites and basalts plus moaning/groaning in the alkali. Yet nowhere so far in my experience to be more than an annoyance. The rocks tend to be surface or very shallow (though not always!) and the alkali areas I have done quite well in by just slowing way down. yes every one has been boot accessible and for me its only been a few area of one mountain thats given me trouble, there are just to many of these andesites in one place and the high low pitch is constant while my coil is in motion. this has to be some of the worst ground anywhere and I'm not experienced enough to deal with it. Link to comment Share on other sites More sharing options...
WesD Posted October 11, 2015 Share Posted October 11, 2015 The Andesite bombs have always been a problem with past pi detectors, but the issue I have is with certain Motherload "hot" slates/shists with surrounding red soils and clays. These areas were a tough ground balance for me with the GPX series, but even more so now, with the increased sensitivity of the 7000. Im using difficult but it still groans. Otherwise It's a killer detecor on old patches, but there's room for tweaks and improvments imo. 3 Link to comment Share on other sites More sharing options...
1515Art Posted October 11, 2015 Share Posted October 11, 2015 thanks, just understanding a problem better makes it easier to deal with. I'm anxious for this update rumored for the gpz, my gut says its likely more than a minor tweak as that could have been done fairly quickly and with all the hype and energy that went into the initial release of Zed quickly followed by nothing at all... well something should have been in the works to ride the wave from the release of this new technology, Coils, the long life battery? Something to take advantage of the press while they have it. my hope is this release is something that was already in the works prior to the initial release at the beginning of the year, something intended all along. wishful thinking I'm sure, but this detector was engineered to upgrade, the initial release seems fairly basic in its extraordinary way and something surely must follow? Link to comment Share on other sites More sharing options...
Sourdough Scott Posted October 12, 2015 Share Posted October 12, 2015 Just saw on Facebook that minelab has released a gpz update. From Facebook and finders keepers also on Facebook. Link to comment Share on other sites More sharing options...
Reno Chris Posted October 12, 2015 Share Posted October 12, 2015 Here is a link:http://www.minelab.com/usa/consumer/knowledge-base/news?article=287212 Link to comment Share on other sites More sharing options...
jasong Posted October 12, 2015 Share Posted October 12, 2015 Nice, can't wait to get out to the field and try this out. Link to comment Share on other sites More sharing options...
Steve Herschbach Posted October 12, 2015 Share Posted October 12, 2015 Details have been posted here on the forum at http://www.detectorprospector.com/forum/topic/1293-gpz-7000-software-update-official-release-information/ Link to comment Share on other sites More sharing options...
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