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Exciting TDI Discovery


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To start with I must confess and hope the following information doesn't give the wrong impression about the TDI SL.  It has a lot of potential, but only in certain locations not loaded with a lot of nails. 

I started inquiring about some old locations I hunt. Most of the locations are old, shut down schools where coal was used as a heating source for decades.

Before the EPA was birthed most people did what ever pleased them when it came to disposing of waste, regardless of what it was and these old school sites are no exception. The burnt coal waste was spread over many acres of school property which created some extremely harsh ground conditions. Grass and weeds find it hard to get a start and most areas are void of any vegetation. Most of the school grounds look like Martian landscapes with small BB size or smaller pieces of coal waste everywhere. This material attracts to a magnet with little effort and can reduce depth of all VLF detectors by well over half. In fact until recently maximum detection depth was actually 2-3”, any target deeper would give a solid iron audio report if any sound at all. After many years of hunting these areas all but completely unsuccessfully I finally purchase a White’s TDI SL.

It turned out the SL opened up these old sites and many nice coins and relics were unearthed, but not without many trials and numerous adjustments.

Case in point: one particular area had been, in my opinion hunted out with many different VLF machines over a 10 year period and I was certain there were no good targets left. I had been hunting about 15 minutes and all the SL was giving were very short audio reports, which sounded more like chatter or EMI and not targets. This prompted me to increase the time delay to about 15 “which increases the time before a transmitted signal is analyzed” thinking the small pieces of coal waste were the short reports I was hearing. Continued hunting another 5 minutes and noticed the short audio chatter continued but not to the same magnitude. Stopping and increased the delay to around 17 and off I went hunting again. Suddenly I noticed the machine was running very quiet, to quiet.

A minute or two later and a very loud low tone, which on the SL means a high conductor, I stopped and reduced the delay to 10 and found my definite answer. The coal waste was causing all the ground chatter and false audio reports. Increased the delay to 17 and recovered a wheat penny around 4” deep. Now to be honest I had to stop for a moment and think about what just happened. Decided to start over I returned to where I began hunting and discovered I had passed right over many good targets. After digging a few more wheat’s I decided to start checking these targets before digging and discovered if I decreased the delay most of these targets became the short sounding audio reports I had heard earlier. The PI was just the trick to discovering some nice coins deeper than 4” in these barren areas.

I must add the SL is not the best choice to make if there is an over abundance of nails because of the very limited discrimination capabilities of this particular machine. As a final note I must admit this machine has opened up a lot of hunted out harsh ground sites.
 

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It's nice to see experimenting with settings and using one's head pay off.  Nice effort, Mark.

I might have missed it here (or in your other post about hunting in ground inundated with coal cinders), but what coil(s) are you using?

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2 hours ago, GB_Amateur said:

It's nice to see experimenting with settings and using one's head pay off.  Nice effort, Mark.

I might have missed it here (or in your other post about hunting in ground inundated with coal cinders), but what coil(s) are you using?

For this site I tend to prefer a smaller than 12" stock coil, but this discovery was made with the stock 12" dual field coil.

I use both the 12" and 7.5" dual field coils from White's

 

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