Iron discriminate mods

[sjm]

Hi,

I built a HH over Christmas, and am very happy with it's performance at finding iron
objects...

I live in the goldfields region of Central Victoria, Australia, and during my first test I found more than 30 old nails, 10 bolts, 3 horse shoes, a plumb-bob, a button, plus dozens of other scrap iron objects. This was in old mullock heaps and tailings from shafts. I know the HH can detect my gold wedding ring at more than 12" in air, but how can I modify it so it's no so sensitive to iron? I am only interested in gold detecting, not general metal. Is there a simple way to make the HH discriminate against iron?

Thanks,
steve

[Igor MN]

Steve,when you decided to made HH,u should know that pulse induction detectors can't discriminate metals! U need a VLf or BFO metal detector.they are more complex for building.search in forum,there is so mutch schematics here.also u can made faster coil,look in coils forum