Goldscan Depth Question

[Mr.Bill]

Your mentioning defective ??? It may not be the fault of the detector at all. It would need to be looked at, before that could be determined. Anything other is pure speculation.

If it were something in the unit, not caused by someone else's fingers, most certainly it would be taken care of. By not letting someone else like Eric look at it, how can it be determined ?

You had some quite raving reviews that you pened on your forum about the GS5.

 

[prospectinginoz]

Yes I understand that,the ML will retain (or remember) in fixed the last Gb position so yes there is no straight GB mode. In fixed on a ML the tracking is disabled or paused on all signals above threshold amplitude.
But the key point on the gs5b is the difference in depth between straight Pi mode and GB mode on my machine. I have done very extensive air tests on the GS5b with the GB set from fully anticlockwise to fully clockwise vs pulse delay with a variety of coins and nuggets and in all cases I find a big difference between straight Pi mode and GB mode. If my Gs5b is defective than the importer should offer to replace it at no cost and send mine back to Eric to be checked out or import another circuit board and replace mine again at no cost.I don't intend to comment any further on this matter publicly until I have spoken personally to Eric to discus this matter and to inform him of what the importer has been saying and doing in connection with the Gs5b and other matters.
Doug

 

[prospectinginoz]

I have done very extensive air tests on the GS5b with the GB set from fully anticlockwise to fully clockwise vs pulse delay with a variety of coins and nuggets and in all cases I find a big difference between straight Pi mode and GB mode.

pulse delay in the above post should read sample delay.
Doug

 

[Reg]

Hi Doug,

You mention you have a 20% depth loss when switching from straight PI to GB mode on the GS 5 and somewhere up to a 30% depth loss on certain nuggets.

Now, my basic questions have to do with the new ML 4000 and other ML's and their comparisons to the GS 5. Do you find about the same percentage of loss when using the smooth mode on the ML 4000 detector when compared to the normal or one of the other modes?

My guess is the losses will be similar.

What I have seen from all the various posts is Eric's detector operates smoother and quieter over hot ground and hotrocks than most of the ML's but has less depth even when when compared to your GP 3000.

Now, along comes the ML 4000 with a smooth mode and suddenly, it displays depth losses also but also reduces the hotrock problem and quiets the ground. This reduction in hotrock problem and quieter ground also sacrifices depth.

Anyone besides me see the what this is telling us?

Cheers,

Reg

 

[prospectinginoz]

Yes Reg you as always make some very astute points. But if we forget about using mono coils over very mineralized ground then we don't need to use smooth mode on the gpx 4000. I always use DD coils on my 3000 and have never found ground I can't detect. Yes you will have some ground noise even with DD coils on our very worst ground,but I will still go 20% deeper than a Gs5B with a comparable mono coil. To me we can be far to manic about ground noise sometimes and also about using mono coils. What some forget is the DD coils over very extreme mineralization will actually go deeper because of a better S/N. I love it when I find very high mineralization in the gold fields that has only been gone over with mono coils (often recognized by dozens of abortive holes!) because I know that if the ground is deep enough then there is a good chance that many deeper nuggets have been missed. Even the dedicated,expert mono users here in Vic will go back over a good patch in very mineralized, deeper ground with a big DD coil and often recover more nuggets.
Doug

 

[Eric Foster]

I saw ground in Australia where an experienced 3500 operator using a DD coil, had problems with ground noise to the point that it was hardly worth detecting. This apart, users tell me that there are many sites in Australia where there is not only ground noise, but em noise from power lines, telephone cables, cell phone towers, railways, road traffic, over the horizon radar, aircraft, lightning, and if it is to be believed, solar flares and wind static. The GS5B ignores all of these to a very large degree. You will have seen pictures posted on this forum of nuggets found with the GS5B from one such area, near power and telephone lines, and a road.

Eric.