Instruction manual
Coil Options
46
With the Double-D coil, one “D” is the transmit wire winding and the
other “D” is the receive wire winding. This is easier to understand when
you think of the coil as being two capital letter D’s, with the right side
facing properly and the left side reversed. The detection eld on a
Double-D coil is down the center of the coil, front tip to back tip, at a
fairly consistent depth. This detection eld does not diminish in the same
regard as the Concentric coils. But all coil designs have a diminishing
detection eld, the farther they penetrate into the earth.
Even though the detection eld of the Double-D doesn’t diminish as
quickly as the Concentric coil, I still like to overlap the swaths on a
Double-D coil by at least 1/3. Now, with all that said, let me reiterate
that ALL X-TERRA coils are capable of nding ALL metals. Some just do
it better than others. It all depends on the site you are hunting and the
targets you are looking for.
Understanding your X-TERRA - Coils