GPZ 7000: Threshold Vs Sensitivity Vs Volume Vs Volume Limit (with Discussion On Audio Smoothing, Coil Control, Range Of Motion And Manual Ground Balance)

[jasong]

Only question I have left is are we going to have to just talk about the weather once the 6000 makes settings discussions redundant? 

[flakmagnet]

44 minutes ago, jasong said:

Only question I have left is are we going to have to just talk about the weather once the 6000 makes settings discussions redundant? 

I guess not if you have a 7000. Hope things are going good for you Jason.

[Jonathan Porter]

1 hour ago, jasong said:

Only question I have left is are we going to have to just talk about the weather once the 6000 makes settings discussions redundant? 

There’s enough user controls on the 6000 to keep us all busy, finding out whats going on under the hood and then using that to good effect is half the fun.

[Gold Catcher]

And then of course the speculation about the "8000" will also start soon. We will keep ourselves busy I have no doubt.

[Jonathan Porter]

12 hours ago, mn90403 said:

JP,

Is this your definition of 'fringe' detecting? 

Hearing at first a faint target and then interrogating it to Ground Zero.  If your target is very deep/small then Ground Zero is proportionately small.  Some like me might think it an iffy target but an experienced detectorist would say it is a clear target in that situation.

Big targets are forgiving and can be heard with many settings unless they are too deep.  It is the little target sounds that require concentration and optimal settings for each of our styles.  Maybe these are the fringes the 6000 will excel at without doubting an array of other settings.

 

I have one phrase in answer to all this, “Range of Motion”. Every target has its optimal coil movement which is coil height, coil windings orientation and coil speed relative to Ground Zero. You can call the speed “speed dependant” if you like as we are almost always talking about ‘Motion’ detectors. The range of Motion is dictated by the ‘lead in and tail out’, swing speed is dictated by ‘Range of Motion” distance, ground conditions and size of target relative to depth.

Once you get the “Range of Motion” worked out (that’s the distance measured between the start of the ‘lead in’ through GZ and out to the very end of the ‘Tail out”) then its just a case of massaging the swing speed and coil orientation to get the target signal to manifest properly compared to localised ground signal responses.

These things are all being performed by all detector operators even inexperienced ones, it’s part and parcel to the use of a modern gold hunting motion metal detector. I find it’s best to be aware of them but not try to force things because gravity is your best friend when it comes to control, kinetic energy is an amazing control once something is in motion. 

In the case of the GPZ there’s a few factors to take into consideration when performing these tasks, first there is the visualisation and locking into memory information first experienced when the potential target was discovered, then there is the information pertaining to the Semi-Auto GB and how it interacts with said potential target, then there is the comparative information based on a locked or Manual GB pertaining to the target. All the while attention is being paid to swing speed, coil orientation, direction of sweep ect. The whole time this is going on I am doing my best to pendulum the coil in a smooth and controlled fashion over GZ, I let our beautiful world do the controlling part because she’s so much better at it than me. 😊 

2 1/2 foot 2 ounce speci I massaged in with the help of planet earth and a good “Range of Motion”

 

 

 

[Gold Hound]

12 hours ago, Jonathan Porter said:

I have one phrase in answer to all this, “Range of Motion”. Every target has its optimal coil movement which is coil height, coil windings orientation and coil speed relative to Ground Zero. You can call the speed “speed dependant” if you like as we are almost always talking about ‘Motion’ detectors. The range of Motion is dictated by the ‘lead in and tail out’, swing speed is dictated by ‘Range of Motion” distance, ground conditions and size of target relative to depth.

Once you get the “Range of Motion” worked out (that’s the distance measured between the start of the ‘lead in’ through GZ and out to the very end of the ‘Tail out”) then its just a case of massaging the swing speed and coil orientation to get the target signal to manifest properly compared to localised ground signal responses.

These things are all being performed by all detector operators even inexperienced ones, it’s part and parcel to the use of a modern gold hunting motion metal detector. I find it’s best to be aware of them but not try to force things because gravity is your best friend when it comes to control, kinetic energy is an amazing control once something is in motion. 

In the case of the GPZ there’s a few factors to take into consideration when performing these tasks, first there is the visualisation and locking into memory information first experienced when the potential target was discovered, then there is the information pertaining to the Semi-Auto GB and how it interacts with said potential target, then there is the comparative information based on a locked or Manual GB pertaining to the target. All the while attention is being paid to swing speed, coil orientation, direction of sweep ect. The whole time this is going on I am doing my best to pendulum the coil in a smooth and controlled fashion over GZ, I let our beautiful world do the controlling part because she’s so much better at it than me. 😊 

2 1/2 foot 2 ounce speci I massaged in with the help of planet earth and a good “Range of Motion”

 

 

 

I totaly agree with what you say about range of motion. This is the point I was trying to make earlier in the discussion.

Over the years I have noticed that all good operators have mastered this skill.

I solely focused on teaching my Wife Amber this skill in 2019 as she had never detected before. With careful guidence she was able to do very well, she found enough gold to make a decent living. By the end of season she ended up averaging 5g per day! this is very good for someone who had never touched a metal detector before. Credit to her though, she is very easy to teach and by the end of season she knew all the settings and was coming up with spots to go have a look at from my geology teachings. Im so greatful to have her😀

I focused on this because it is the core skill required to sucessfully use any metal detector. This really is what seperates the good operator from the average!

Do you use Manual Ground Balance much Jp?

I use it a fair bit, I've found in the right conditions that I can get a better target response on both long and short time constance targets using it.

Here is a nice long time constance bit I carfully massaged out of 900mm hard packed cemented alluvium... nasty stuff as it has a ferrous upper layer and calcium rich lower layer.

[Gold Hound]

I also use range of motion to filter out ground signals, by slowing or speeding my range of motion over suspicous targets I can test the target to see if its worth digging. Which saves me quite a lot of waisted time in digging false targets and allows me to run normal in some pretty trying ground.

[geof_junk]

24 minutes ago, Gold Hound said:

.

Nice lump, I like manual but would like Auto with a plus or minus bias.

[Jonathan Porter]

Wowsers nice chunk!! Knowing the country you work that piece could go anywhere from 8 to 16 ounces? 

9 hours ago, Gold Hound said:

Do you use Manual Ground Balance much Jp?

I use Manual a lot if the conditions allow or call for it. Outright depth is always achieved by using a fixed or manual ground balance, in the case of the GPZ and its stupidly linked Quick-Trak to the ferrite calibration this means going in and out of Manual and Semi-Auto modes via the menu. If your lucky enough to work in an area where X signal is not an issue then obviously you could use the QT button and speed things up. 

So yes in homogeneous ground where the GB is not altering much over a larger footprint I will definitely operate in Manual GB mode especially when using the larger coils. A prime example is the gully washes up in FNQ and the Kimberlies in WA and also some areas over in the Pilbara in WA.

JP 

 

[Norvic]

1 hour ago, Jonathan Porter said:

A prime example is the gully washes up in FNQ and the Kimberlies in WA and also some areas over in the Pilbara in WA.

I wish to correct your statement here a wee bit JP, a prime example is some gully washes in FNQ, certainly not all, perhaps that was just a typo on your part. I find with patience, persistence and when I`m in the mood manual GB is the way at times, auto or semi auto at other times but manual GB almost all the times in those quiet gullies for max depth no doubt. Actually I have never found areas in any of the OZ states I worked where manual GB can not be used to find gold, maybe this is because I started detecting long before auto GB capable detectors come on the scene but I doubt it. Manual GB to me is simply a setting on the Z that allows it to be more productive at times, tis a most powerful gold detector. PIs I almost always operated in Manual GB, the Z not always as its auto GB settings to me are so much more productive then the PIs that allow the selection of auto or manual GB.

If we disagree here then I am happy to agree to disagree but if you are up this way and you have written property owner permission to detect in my "backyard" I can take you to many such noisy FNQ gullies as I am sure other long term FNQ operators can.