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Post  Tarnagulla on Sun Jul 26, 2009 11:06 am

Just wondering if any one can help with the best settings for maximum depth in reasonably hot ground.
I am using a gpx4000 with a 18 inch mono coil, I have flogged the area in sensitive smooth and have done very well but the ground is very deep .I have tried a few settings in normal timings but found it to noisy to hear faint signals.Thanks in advance for any help.
ron.

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Post  Guest on Sun Jul 26, 2009 11:42 am

Hi Ron,
I use a 16inch Mono on a 4000, my settings are motion slow... audio normal or boost...gain 8 ot 9... endcap timings on normal or salt depending on the noise... mono and not DD as some prefer ... tracking but when digging I go to fixed

I also find that early morning is the time when there is little noise arond here up to about 10.30 - 11am

Ray

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Post  Tarnagulla on Sun Jul 26, 2009 12:35 pm

Thans for that Ray, do you use sensitive extra at all?
Ron

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Post  Qld Sandy on Sun Jul 26, 2009 2:00 pm

Tarnagulla wrote:Just wondering if any one can help with the best settings for maximum depth in reasonably hot ground.
I am using a gpx4000 with a 18 inch mono coil, I have flogged the area in sensitive smooth and have done very well but the ground is very deep .I have tried a few settings in normal timings but found it to noisy to hear faint signals.Thanks in advance for any help.
ron.

Ron,
If the ground is warm and the EMI levels are not too bad then try a larger mono coil. A 25" would be good and try to run the highest motion speeds and gain levels that interference will allow you to, and also run in Deep audio if possible. It might take some fiddling to get a combination of all these settings to suit.

The other option is the largest DD coil you can get a hold of, and try to run in Normal timings, Deep audio and fixed preferrably, or in tracking and switch to fixed to check and signals. Deep audio, high gains over 8, and high motion settings all allow in interference with a mono coil, especially a large one, so it might take some experimenting to get it right. Cheers and good luck.
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Post  Guest on Sun Jul 26, 2009 8:41 pm

I find with my 4000 not much ground i can use in normal mode.

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Post  Tarnagulla on Sun Jul 26, 2009 9:03 pm

Thanks for your reply Ray ,Qld Sandy and Claimpeg but I have tried dd coils and still found them noisy and as claimpeg says I still have trouble in normal timings.
regards Ron

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Post  Mark on Mon Jul 27, 2009 9:27 am

Hi Ron,
My 4000 is also noisy in "Normal" in hot ground, I have tried using a DD and de-tuneing other settings with no success. As suggested you could try a larger mono for extra depth in "sensitive", I think you may have reached the "limit" of the 4000. You may have to wait and go back to your spot with the new 5000.
Cheers Mark. Laughing
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Post  Guest on Mon Jul 27, 2009 9:50 am

When the 2100 came out after the 2000, it had a couple of knobs etc...stable... i went out and found about 7 ounces in the first week on old 2000 spots, these things...4000 s etc etc....20,000 settings whatever, dont find any big gold, or much small gold either. Lets hope that Minelabs next machine will really be a giant leap.

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Post  Guest on Mon Jul 27, 2009 9:56 am

Anyone used a 25 inch mono in sensitive smooth????

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Post  Tarnagulla on Mon Jul 27, 2009 11:07 am

Claimpeg, I hav'nt used a 25 inch mono in s/smooth but I have used a 20 inch mono in s/smooth and found it very good. I always detect in fixed, gain 7 or 8,deep on front panel, deep audio when using large coils.
Ron

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Post  spidertice on Mon Jul 27, 2009 4:35 pm

Hi
i find that when my 4000 gets noisy and wont settle down, if you try and ground balance it out on your pick, then do it normally and it runs as quite as a mouse,, must wake the system up or something ????? and while we are on settings for a 4000, when i work underneath power lines turn the gain up, boost, cancel, deep, normal timings,fixed tracking, slow motion, and i use the standard 11'' dd coil

spider


Last edited by spidertice on Mon Jul 27, 2009 6:04 pm; edited 1 time in total (Reason for editing : add more info)
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Post  Guest on Fri Jul 31, 2009 7:17 pm

Hey Claimpeg..
Yes I have a 25 N/F Mono... works fine in sensitive smooth... the only problem I find with such a big mono is pin pointing and dragging round the excavator.... I carry a small 10X5 for pinpointing thou....

Ray

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Post  Tarnagulla on Sat Aug 01, 2009 5:38 pm

Hi Ray, What is the deepest nugget or speciman you have dug using the 25 inch mono on your 4000.
regards Ron.

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Post  Guest on Sat Aug 01, 2009 9:19 pm

Hi Ron,
The deepest was a horse shoe down about a bit over a metre..... didnt meaure it but it was a damn long way down.

Ray

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Post  hoolahoopa on Mon Sep 28, 2009 10:47 pm

sorry to revive perhaps a dead subject.
but i tried to run my 4000 with the standard 11inch dd on some ground i have been detecting with no success. i gave up in the end and went back to my 14x9 mono as i could get that much quieter/stable, probably because of sensitive smooth. with the dd i used the basic factory settings (the ones in the manual). any body have any ideas as i thought it should of been a bit quieter with the dd.

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Post  Mark on Tue Sep 29, 2009 11:32 am

Hi Hoolahoopa,
Sensitive smooth (ss) is the secret to the 4000, I am in Victoria where most of the ground in the goldfields is noisy, ss also allows you to use a mono coil which gives a better coverage than a DD. The only time I get the DD out is to use discrimination in high trash areas. Many areas were no go zones before ss even with a DD, the loss of depth you get with ss is more than compensated for with access to the area and the ability to use the more sensitive mono coil. I believe thats the reason more gold was found after their release. The 4500 appears to have addressed this area where many users say they get better depth with the ss settings on the 4500. I would expect any improvements to a new model will futher improve this area. Your not alone, wishing for a quiter machine with more depth.
Cheers Mark.
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Post  Tarnagulla on Tue Sep 29, 2009 6:56 pm

What I am trying to say is that the gpx4000 runs beaut in s/smooth with a mono coil but runs noisey with a dd coil no matter what setting is used in even normal settings which is strange for a dd coil.

Regards Ron

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Post  Guest on Tue Sep 29, 2009 8:57 pm

Hi Ron
It is strange that your machine is noisey on a DD coil.Theres a lot of moisture in the top level of the soil at the moment that can affect running Monos in normal timings,But this has a lesser impact with DD coils.Set your machine on factory presets.If its still noisey I would suggest you return the box to the dealer your purchased it from.From memory I think there is a five year warranty on the box.
Cheers Dig

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Post  hoolahoopa on Tue Sep 29, 2009 9:07 pm

same deal ron, i might do as dig suggests as it needs to go back for the power switch upgrade anyway. thanks for the reply mark.

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Post  Guest on Tue Sep 29, 2009 9:23 pm

Hi Mark
Thats one of the great things about Minelab is their after sales service .Like all products things can go wrong.My 4000 left coiltek Maryborough on a thursday and was back running like a dream on the following tuesday Thats Service
Cheers Dig

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Post  Guest on Tue Sep 29, 2009 9:47 pm

Hi all...
I have to agree with old Dig... the 4k should b running quite with a DD... I had a similar problem and sent mine back to minelab and its as quite as now...can even run mono's in normal timings normally... not with all the moisture in the soil thou...


Last edited by raymondj on Wed Sep 30, 2009 8:11 pm; edited 2 times in total

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