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I hear a lot on other forums that the stock 12" coil that comes with the TDI SL is not the best coil. I find it hard to understand their statements, because the 12" coil is all I've ever used. It has good depth, or better said it hits well on all my test garden targets (that have been in the ground an undisturbed for over 7 years now). The only time I notice an issue is in the trashy areas, it takes quite a bit of extra work to swing and rotate around some targets to locate them prior to digging.
I guess before asking my question I should indicate they type of hunting I do.
First off I use my SL to hunt for the missed coins and relics in some of the worst ground conditions for my area. These areas are littered the coal waste "after burnt", these sites are all but impossible to hunt with the traditional VLF machine. I have found many coins in these areas, see next paragraph.
Secondly I plant to make one trip to the beach each year.
Second hunting trip:
Went to an old school where the coal cinder waste has been dumped for years and hunted for 1 ½ hours. This area has been grid hunted for years and I was sure there were no goodies left to be found. Well wrong again.
GB to a little over 8, pulse 10, gain 10 and off I went; very first signal was a wheat penny at 4-5 inches and perfectly vertical. You can see the scratch I made with my shovel. Wow, was I off on my pin pointing skills. Couldn’t believe how I could have missed that one because it gave a very good, consistent audio response from every direction. One thing I noticed, it didn’t give a double beep like a VLF machine would on a vertical coin.
Thought I had the sound nailed down, but was I wrong. Started digging nails, three to be exact, all sounded fairly good but I could tell there was something wrong, but I’m learning, so I dug anything that sounded remotely good.
A few minutes later, not more than 10’ from the penny, another signal that sounded different, not sure what sounded different, still learning. Wow, a silver dime and not quite 5” deep. Now I am wondering how I could have missed that one, not a clue yet.
Well anyway, the next two targets were nails, then another perfectly vertical copper penny. Had a very good hunt, for an area that basically dried up over a year ago. Wonder what I'll find once I have a little time on this machine?
Question 1:
When it comes to ground coverage is the entire coil used or only the one in the center?
If the 12" is not the best for my type hunting what is?
I guess before asking my question I should indicate they type of hunting I do.
First off I use my SL to hunt for the missed coins and relics in some of the worst ground conditions for my area. These areas are littered the coal waste "after burnt", these sites are all but impossible to hunt with the traditional VLF machine. I have found many coins in these areas, see next paragraph.
Secondly I plant to make one trip to the beach each year.
Second hunting trip:
Went to an old school where the coal cinder waste has been dumped for years and hunted for 1 ½ hours. This area has been grid hunted for years and I was sure there were no goodies left to be found. Well wrong again.
GB to a little over 8, pulse 10, gain 10 and off I went; very first signal was a wheat penny at 4-5 inches and perfectly vertical. You can see the scratch I made with my shovel. Wow, was I off on my pin pointing skills. Couldn’t believe how I could have missed that one because it gave a very good, consistent audio response from every direction. One thing I noticed, it didn’t give a double beep like a VLF machine would on a vertical coin.
Thought I had the sound nailed down, but was I wrong. Started digging nails, three to be exact, all sounded fairly good but I could tell there was something wrong, but I’m learning, so I dug anything that sounded remotely good.
A few minutes later, not more than 10’ from the penny, another signal that sounded different, not sure what sounded different, still learning. Wow, a silver dime and not quite 5” deep. Now I am wondering how I could have missed that one, not a clue yet.
Well anyway, the next two targets were nails, then another perfectly vertical copper penny. Had a very good hunt, for an area that basically dried up over a year ago. Wonder what I'll find once I have a little time on this machine?
Question 1:
When it comes to ground coverage is the entire coil used or only the one in the center?
If the 12" is not the best for my type hunting what is?
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