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Hi Eric, Reg, Kev. Math formula please?

W

Wirechief

New member
Hey Guys,
I am wondering about that formula that will tell you approximately when you increase the diameter of the searchcoil how much more depth there might be? I hope all of you are doing well and the weather is being good to you guys. It has finally cooled off here in West Texas. I also queried Trev at Coiltek about this too. I hope my email goes to the right place. I believe everyone pretty much recommends for a first coil project that an 11in. mono is best. Ok see y'all later and God Bless. John the Wirechief.
 
Re: Question on coils

Posted by: Eric Foster (ache-los-ac07.proxy.aol.com)
Date: May 18, 2005 12:26PM


Here are the curves I have used for many years. The range reaches a maximum when it is equal to the radius of the coil. Coils larger or smaller than this optimum will result in less range. To show how this works, along the bottom axis you see coil diameter, which is obviously 2 x the radius. So for an 11in coil, if we go up the vertical scale to A, we have 5.5in. Also note the diagonal line and the series of ever increasing semicircles. Everything to the left of this line shows increasing detection range up to the maximum where it intersects the line, then decreasing range to the right, where the semicircles are shown dashed.

If a certain metal object is just detected at 5.5in with the 11in coil, then going larger in coil size will cause a reduction (going down the dashed side), and going smaller in coil size will have a similar effect. Initially, it won
 
.

Posted by: Eric Foster (195.93.21.66)
Date: May 26, 2005 05:38AM


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Hey Mr.Bill!,
Thank you very much for the info and graph and this will give me some good stuff to ponder on. How are you doing Mr.Bill? I haven't talked to you for awhile and hope business is good. It is pretty dead here. At least the rattlesnakes are starting to look for their dens and won't be as risky to get out to detect. God Bless ya Mr.Bill and appreciate the info and nice to hear from you again. CU later de John the Wirechief.
 
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