Weird coil behaviour - 5" coil ids 1$ coin differently from 11" coil

Gadgetguy2005

Tenderfoot
Apr 29, 2016
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Weird coil behaviour - 5" coil id's 1$ coin differently from 11" coil

Hello all,

I am using a Fisher Gold Bug Pro - with two coils: the small 5" coil and the larger 11" coil.

The two coils ID most items similarly (for example - pull tab as 59 or 60, silver coin as 95 etc.).

However, for the Canadian 1$ coin they behave very differently: the small coin ID's it with a number in the 40-50 range (not very stable), while the large coil ID's it as 10.

I have done this test in many different ways (air test, outside with coin on the ground etc.) but I am always getting the same result.

What is going on - what would explain this difference?

Thank you for any ideas...

PS: I just received a Nel Hunter coil today - that coil also ID's the $1 coin as a 10
 

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