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level adjust on the gp extreme

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level adjust on the gp extreme Empty level adjust on the gp extreme

Post  lockie86 on Wed Mar 14, 2012 7:50 pm

G'day all new to the fourm and prospecting. i got a gp extream as my first detector and all is going well finding heaps of lead and a few old buttons. i just dont get what the leval adjust knob does {been runing it at 12 o clock} Is it only used in discriminate mode or does it efect all metal mode as well.
thank in advance lockie

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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  geof_junk on Wed Mar 14, 2012 8:24 pm

On both the GP extreme and 3000 it does effect all metal mode when in Auto-Ground Tracking. !2 o'clock is the correct position. I think JP mention it many years ago.
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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  kon61 on Wed Mar 14, 2012 11:59 pm


G'day Lockie86.

The level adjust works only in tracking,not in fixed,and it affects both the sensitivity of the machine locking on to hot ground,hot rocks or metal targets whilst in tracking,as well as the sensitivity of the discriminator locking on to positive targets and tracking them out.When wound fully clockwise in all metal,you'll find the tracking system of your machine more sensitive towards locking on to hot ground,hot rocks,metal targets or faint positive signals.When in discriminate mode you'll find your machine more sensitive in triggering the discriminator towards iron metal targets and discriminating them out.The opposite applies to both when the level adjust is turned fully anti-clock wise.The 2o'cklock position gives you the best of both worlds whilst in tracking.The level adjust plays no role whilst your machine is in fixed mode.

Cheers kon61.
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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  lockie86 on Thu Mar 15, 2012 8:15 pm

thanks geof and kon. most off the time i just ground balance in tracking then switch back to fixed.
when discriminating can i run the level adjust higher with out any disadvantages?

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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  geof_junk on Thu Mar 15, 2012 9:04 pm

lockie86 wrote:thanks geof and kon. most off the time i just ground balance in tracking then switch back to fixed.
when discriminating can i run the level adjust higher with out any disadvantages?


The best tip anyone can give you is this:- Do not Discriminate for gold till you have at lest 100 ounces of gold found with a MineLab then only do it when you want to leave gold behind.
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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  kon61 on Thu Mar 15, 2012 11:24 pm



G'day Lockie86.

As Jeof_junk stated with the current line of pulse discriminators,I wouldn't use them for discriminating when detecting for gold at all,for they've been known to leave gold behind.As for the level adjust,the higher clockwise yo go,the more aggressive or sensitive the discriminator becomes to locking on to targets and blanking them out.

Cheers kon61.
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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  jedda on Sun Aug 10, 2014 9:11 am

just a minor query here

I have read many times that running a detector in discriminate is not advised "it leaves gold behind", or "misses gold" now if this is true, how do we know we have left gold behind if we leave it without digging it?
use a mistake detector? Rolling Eyes 
I have an extreme a gmt and a eureka gold and used to have a whites 6000dbi I found quite a few nuggets with the whites only in discriminate and have found one of the smallest pieces I have ever seen with the extreme in discriminate , over time I reckon I have the responses down pretty well, ie. the signal noise from the target with the extreme, which I don't usually run in discriminate, however I have done air tests on gold nails lead aluminium in discriminate and found that it does vary the signal quite a bit, gold seems to always be a solid unbroken signal as well as lead in discriminate whereas alloys and alumin and iron breaks up with the button turned fully clockwise
I have dug many targets that when switched to the discriminator have a broken signal on and guess what, they have never ever turned out to be gold

the gmt is pretty good at discriminating iron with the "grunt" response

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level adjust on the gp extreme Empty Re: level adjust on the gp extreme

Post  Qld Sandy on Sun Aug 10, 2014 2:37 pm

lockie86 wrote:thanks geof and kon. most off the time i just ground balance in tracking then switch back to fixed.
when discriminating can i run the level adjust higher with out any disadvantages?

The level adjust control has 2 functions.
It controls the amount of discrimination applied if you are running the discriminator (you need a DD coil for this).

It controls the "pausing effect" of the ground balance circuit if you are detecting in tracking mode. That means it controls how large a response has to be to make the tracking function pause (stop ground balancing). 12.00 is the recommended setting. If you set it low then you may as well detect in fixed as the ground balance stops on just about every little squeak. Setting it high allows you to detect the hotter ground more easily as the detector keeps balancing, but may track out a faint deep target.

Cheers.

ps forget the discriminator exists. I tried my 3000 on a small specimen that had 1/2 ounce of gold in it and at the 12.00 setting the detector blanked it (rejected) when the spec was sitting on top of the ground. Last time I ever tried it from memory.
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