Look here, there is a Surf PI forum:-
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http://www.geotech1.com/forums/showthread.php?t=13810&highlight=pi+surf+coil&page=15
Read the whole forum of course but there are some coil details on page 15, posts 356, 367 and here:-
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http://www.geotech1.com/forums/showthread.php?t=13810&page=8
Page 8.
There may be a need to join the forum as well, but it is free.....
Regards
Andy
Posted on: October 24, 2011, 05:28:58 AM
I forgot to mention that larger coils search deeper, but may miss smaller objects, basically you need then to have two coils that you can swap when needed. A small one and a large one. By small say around 20cm and by large say around 30cm.....but they can be even larger if searching for big pieces of metal, very deep though I have never built a Surf PI myself......it may not be 100% true.....
Also, do not forget that you need to
shield the coils correctly for a good working PI detector, especially where ground is mineralized.
There is a blog on the forum that I mentioned for coil construction, read, read and read......otherwise your detector will not work as well with a badly made coil.....the work time is as good as the same for a good or a bad coil!!! Costs too.......
Regards
Andy
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http://www.thunting.com/smf/index.php/topic,28087.msg199410.html#msg199410
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