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Hi all and thanks for the usefull posts in this forum!!! I am new at metal detecting so i got my self a surf pi kit.The kit is build and running as it should be. I have made a 25cm diameter coil using 24awg speaker wire (1,2 ohm coil resistance).I have made this coil just to trim and test the circuit.Now here is my problem...I have been searching geotech threads to find a coil design that is less sensitive but it seems to me everybody tryes to make their coils sensitive to be able to find small items (such as coins and gold flakes)I need a coil for the surf pi 1.2 to be able to find an iron/steel box lets say for example the size of a lunch box at 1 meter deep but overlook small metal parts that may be closer to the surface (coins cigarette papers and such..) First of all is this even possible? If yes would a big square coil be better? lets say 1meter by 1 meter.What is the best wire to fabricate such a coil?? Imagine i have to locate a metal box as described above burried 1 meter deep at the most in a 50sq meter area.Any input would be much apreciated, thanks in advance!!!
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As the coil gets bigger it starts to loose sensitivity to smaller objects, test your system on a metal box like you are wanting to find.
For large coils you may find you need to reduce the pulse rate down and increase the current in the coil by useing thick wire. -
Thanks for your reply.It gets me to the right direction!!! I will try to build a 1x1 meter coil using the chart you provided and some simmilar coils using defferent thikness wire.Ill see what works better.I will then simulate the real enviroment in my back yard since i know what i am looking for and how deep it is so ill have a more precice result!!!! Thanks for your time and answer!!!Comment
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Good luck in your treasure hunt.Comment
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