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How Deep Do Today's Detectors Go Compared To Older Technology?

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2 hours ago, auminesweeper said:

I bought a few of their coils back about 12 years ago and was not overly impressed with them but this last 5 or 10 years their coils are about as good as it get, Right when I had all but given up on  my quest for more depth I was doing the Ebay Tango and saw the one coil I was told not to buy back in the day so last year I bought it, Not only is it a delight to swing but it has added 2 or 3 inches on coins and close to 12"+ on larger items, So I ordered a second one just in case, It can see bits weighing 0.03gm within an inch or so and it has the power ta boot.

I have come to a point where I now believe that the extra horsepower now lies within coil technology because my detech has really opened up my machine and the other 8+ coils have become more like accessories and I am more than happy with depth on a daily bases, to the point where although my machine is getting on in years by design although it is only 2 years old I just don't want another machine and I think that this is bought on by my choice of coil/s.

I truly believe that the future lies in coil selection and design because my VLF now whoops my SL by a fair margin.

John.

The Dtek, (actually spelt D-Tex) I speak of, were only trading in the early MD years to my knowledge. Their main products were the Search King, the Gold King and there also was a Money King I believe. I have found some info on them as per below but there is probably more on the net.

https://www.treasurelinx.com/d-tex.html

 

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On 12/3/2017 at 4:17 AM, Steve Herschbach said:

“Sharp is similar to Normal but creates a more powerful detection field. It is capable of an improvement in depth, but is more susceptible to interference and will increase the severity of false signals in difficult grounds. This timing is best used in quiet conditions and can work well in combination with Deep Search Mode with a reduced Rx Gain setting. Sharp is an excellent tool for pinpointing faint signals due to the very "sharp" signal response. Sharp will work best with DD coils in most gold field locations.”

 

Have a guess who wrote that? :rolleyes:

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On 12/2/2017 at 3:37 PM, goldenoldie said:

Actually just found this video test between a GPZ and GPX on an undug target using larger coils.

 Hopefully Nenad does not mind me posting his test here on this forum and subject.

There appears to be very little difference between both the GPX and GPZ on this target.

Share away no probs. 

The big difference is that the GPZ in Normal with a slightly lower sensitivity could easily be run in that ground. The GPX would need the Sensitivity dropped to minimum, and you'd need to have good tolerance to noise. If I had a time machine, I would love to go back and try a big DD on the GPX. 

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7 hours ago, PhaseTech said:

 If I had a time machine, I would love to go back and try a big DD on the GPX. 

Hi there Nenad.....nothing stopping you from still doing that mate :biggrin:

Good luck out there

JW :smile:

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23 hours ago, Jin said:

In one of your videos JP,  Bruce Candy said that when you get up over 20" that the magnet field in the ground starts to play havoc (or something like that)

He was referring to the salt signal, once a coil size reaches the tipping point salt dominates the signal negating the depth advantage.

JP

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Yep but mainly it relates to PI machines, In short ground noise = Mineralization or mineralized hot spots, with VLF's it presents much larger issues, With new machines we have fast auto-track etc which deals with the changes but not with the feedback from the ground, It can be dealt with in a number of ways IE Whites V-SAT systems or/and running at a much lower gain but with the Older machines they were far better at dealing with such conditions, Where you could ground balance to help cancel out the ground like you can with newer machines but on the older models you could also adjust the DISC to cancel out any ground noise completely, and also they had a lot more power to the point of what a modern day machine can achieve using a 15" Concentric Coil the older machines can/could do using a 9.5" Coil.

When I spoke to a Whites engineer earlier this year he told me that a lot of power was lost when Detectors switched from Analogue to Digital, Because It was the Analogue components that created the Power, where as now it is all done via digital software,

Until a person can run side by side tests as I have done comparing the two technologies only then will you see the differences between them, and to be honest it is a Bitter pill to swallow.

John. 

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1 hour ago, auminesweeper said:

 

When I spoke to a Whites engineer earlier this year he told me that a lot of power was lost when Detectors switched from Analogue to Digital, Because It was the Analogue components that created the Power, where as now it is all done via digital software,

 

This is true however there is no reason why a manufacture could not increase the power output in a digital device.  Its not that the output devices for power are analogue its the drivers and receivers being analogue requiring that power to give us that information to dig or not to for machines of that vintage. :) 

Thing is, to me, there is no reason to do so as digital devices do not really require high power outputs to pull the most information out of the data they process.  In fact I expect it would be detrimental to a digital device with higher outputs as it would create more noise in the data than information.

I feel older tech is still good tech just have to have an operator behind the wheel to get the most from whatever they are using.

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Yep, there is good and bad from both types of tech, I just wish my VLF had the Raw grunt that my older machine has, Although my newer machine is very powerful now I have the coils sorted compared to all others, That old timer  has a heap of power and a Velvet Threshold that is rock solid even when flat out, and the use of the GB and the Disc to deal with the ground is dearly missed on modern machines.

J.

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Interesting thoughts on the coils fellas.

Chatted with the Detech bloke in Daisy Hill the other day and he told me the 15 inch DD flatwound spiral coil will punch 200mm deeper than a conventional 18DD. Not sure if it was sales talk or not but if one was chasing big gold with DD coils then that claim is food for thought.

200mm is a fair margin...

 

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