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I would be open to any suggestion as to selecting a PI land machine. <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)"> I've read about some that can estimate mass. I plan on using one to civil war relic hunt, but I'm concerned about problems I might incounter with electrical power lines, and trash. <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> I read were Jim Pugh in Mississippi had developed a circuit on a water PI that would give a different sound to ferrous and non ferrous, but I haven't been able to contact anyone.
Also the terrian that I'm wanting to hunt is pretty hilly so I'm also concerned that I'll have trouble keeping the coil cosistant to the ground. Also the terrian has some places that are open, say big enough to use a real large coil, and some places are heavely wooded, so the use of a small coil would need to be used in those areas. Most of the good targets ae extreamly deep. This place has been pounded by VLF detectors of all types, and awhile back I dug on a wash down about three foot and rolled out nighty eight French triangle base .69 calliber bullets. <img src="/metal/html/lol.gif" border=0 width=15 height=15 alt=":lol"> So you see I need something to get down a bit deeper.
 
Hi Eddie,
PI started out in 1966 as a land detector for searching archaeological sites for metal objects. In this it was very successful. Today it is generally favoured for beach and underwater detecting, or nugget hunting in areas where there is not much iron trash.
However, there are a few PI detectors that are used for land seaching, particularly if you are looking for larger objects that are buried beyond the range of other detector technologies. Pulstar 2 is one of them and Lorenz is another. A search on the Web will find details of these.
PI detectors for land use generally run at lower pulse rates, wider pulse widths and longer delays than beach detectors. This can make them more susceptible to power line and low frequency rf interference, particularly if large coils are used. However, improvements may have been done to counter this in the above detectors. Noise cancelling coils can also be used.
Eric.
 
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