Instruction manual

45
Due to the design characteristics of an X-TERRA Concentric coil, (think
of a circle within a circle with the outer coil being the transmit winding
and the inner coil being the receive winding), the detection eld near
the surface is much broader than the Double-D coil. However, as the
detection eld of a Concentric coil penetrates the earth, it narrows from
all directions. Because of this, I try to overlap my sweeps by at least a half
when using a Concentric coil.




Understanding your X-TERRA - Coils




Freq. Type Size
Small targets Medium targets Large/deep targets Best pinpointing Best ground coverage Waterproof Water resistant
3 kHz Concentric 9”
a
7.5 kHz Concentric 9”
a
18.75 kHz Concentric 9”
a
7.5 kHz Double-D 10.5”
a
18.75 kHz Double-D 10.5”
a
18.75 kHz Double-D 10” x 5”
a
7.5 kHz Concentric 6”
a
18.75 kHz Double-D 6”
a
(not compatible with
X-TERRA 305)
X-TERRA coils comparison table