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Offline vector180Topic starter
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« on: March 01, 2009, 04:45:35 pm »
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excuse my ignorance on this subject, learning fast Smiley

is it possible to build a larger coil that covers a larger area at the cost of less penetration into the ground? I know my artefacts (arrow heads) are close to the surface, only a few inches. But I want to cover large areas quickly.

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Offline Christian
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« Reply #1 on: March 01, 2009, 04:49:04 pm »
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Using a bigger coil will cover a larger area. Larger coils generally have greater depth on bigger items but will loose depth on small items such coins. If your arrows only metal parts are their heads / tips you can go with a bigger coil like e.g. 15''. However if the whole arrow consists of metal you mide consider a 1 x 1 meter (3 x 3 feet) PI coil and design.

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Offline Cornelius
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« Reply #2 on: March 01, 2009, 04:49:39 pm »
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The larger coil will go deeper but will not show the smaller items like coins . The smaller your coil the more consentrated your search will be .  Cornelius

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Offline vector180Topic starter
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« Reply #3 on: March 01, 2009, 05:14:49 pm »
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thanks Christian, While some arrows maybe aluminium I have to contend with carbon and wood from other archers so the only real common part is the head or point which is 99% always steel or brass.
the arrows don't often bury themselves in the dirt. More so its a matter of them running along the roots of the grass. Totally concealed by the grass but not really under the soil. Quite often, with bare feet, walking over the grass you can feel them  in fact:) But not always.
Most archers know roughly where their arrow is but on the 125yard shots and after 6 or so arrows one does tend to loose track of where each one has landed. Depth perception at that distance is quite difficult. It can easily be 20 m or so beyond or in front of the target.
With say 20 archers  firing 6 arrows ea (all helping to look) most arrows get found..On average maybe we loose 2 arrows in a session.
some are cheap, some have taken maybe an hour to produce if nicely crested etc and we tend to become attached to them Smiley

Its an interesting problem to solve Wink

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« Reply #4 on: March 24, 2009, 04:17:32 am »
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They have soved that problem over here .

                             What they did is put a small bend in the shaft of the arrow and it will boomerang back to you

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« Reply #5 on: May 11, 2009, 01:10:03 pm »
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Depth sensitivity is proportional to the diameter of the coil. Sensitivity to small targets is inversely proportional to the diameter of the search coil. What you need is a long ... thin search coil. That is why oval coils are all the vogue.

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