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Offline wb1951Topic starter
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« on: July 01, 2010, 10:34:47 pm »
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I'm a new member. I want to construct a giant search coil to find big/deep treasure & meterorites. I want to pull it with a four wheeler. I can't seem to find any place to get info on size & type of wire, ratios, construction of frame etc. Any one point me in the right direction??
I din't know if I need to build a detector or adapt the coil to one of my current detectors. Thanks, All

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Offline BitburgAggie_7377
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« Reply #1 on: July 02, 2010, 12:11:04 am »
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welcome, wb1951.   

  What you want to do is nearly as easy as you might think it is.   I suggest you start your quest by reading all the posts at this thread

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  (and follow all the links in each post).
 

BA in Arizona

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Offline Eugene52
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« Reply #2 on: July 04, 2010, 08:53:56 pm »
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Hello wb1951 . Welcome to the Forum !!  The large search coil you want to build is powered by a PI [Pulse Induction] Metal Detector . Just keep posting on the Forum and your questions will be answered .


HH.........Eugene

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Offline Chief Allen
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« Reply #3 on: July 05, 2010, 09:13:39 am »
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i watched a special on tv about a giant search coil which was constructed with pvc pipe pulled behind a 4-wheeler. the grid was built on a small trailer they were on the show Trash and Tresures.on wnin channel 9 which is a public broadcast television. the locater was carried on the front of thr rider,and the coil ran through tbe pipe they were loojing for geodes in mexico.

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Offline Eugene52
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« Reply #4 on: July 05, 2010, 09:46:02 am »
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Hello wb1951 and Everyone . Here are 2 photo's to give you some ideas . And the link has more information . Not very often do I post links to other Forum's but this large search coil is used with the Hammerhead PI and everything is posted over there . 
wb1951, do not forget our forum and please post your progress over here on Thunting.com !!! 

HH..............Eugene


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http://www.geotech1.com/forums/showthread.php?t=13060


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Offline mikebg
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« Reply #5 on: July 08, 2010, 10:57:11 am »
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The size of the TX loop should not be increased arbitrarily because on it depends the GND signal generated by soil .
Typically, the soil has a conductivity and so the metal detector causes eddy currents in it. They run a loop that mirrors the TX loop,ie seemed there is second TX loop having the same diameter but buried in the ground.
From this follows that the soil conductivity creates GND signal having fundamental time constant that we can change designing properly the diameter of the TX loop. We can not change the timeconstant of target because its size is smaller than the diameter of the TX loop.
The task of the designer is to choose so the diameter of the TX loop, that to obtain the time constant of GND less than timeconstant of the target. This achieves lower GND signal and the detector can distinguish from its background the target signal.
The rule is that the diameter of the TX loop is limited by soil conductivity. For example, when searching in a salt sea, the diameter of TX loop must not exceed 26 cm.
Attached photos show large frames that are not applicable to high conductive and saline soils.

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Offline wb1951Topic starter
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« Reply #6 on: July 31, 2010, 11:56:21 pm »
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Thanks for the info. WB1951
Thanks ma lot. I'll follow the links. WB1951

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