82 83Commander CoilsDetecting Tips
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– Do not try to eliminate what might appear to be a faint,
isolated ground noise by balancing the detector over the
target; you may be ‘balancing out’ the target response
from a deeply buried metallic target. It is better to Ground
Balance around the target, without going across it, then
switch to Fixed and try Pinpointing.
– Dig all target signals, even in previously detected areas. The
GPX Series have superior ground balancing and depth so it
is possible to find new targets in well-worked areas where
other detectors have been unable to cope with the high
degree of mineralisation and/or salt.
– In some mineralised soils a response may be received from
a concentration of orange/reddish dyke material or clay.
Remember, a metal target will get louder by moving the coil
even centimetres closer.
– If detecting areas of extremely variable mineralisation detect
along the ground contours rather than across them. This will
often stabilise the effect.
– In heavily mineralised areas the operator may need to sweep
the coil 10–20 mm ( ½”–1”) above the ground. This should
give a more stable Threshold and less ground noise.
– Very sudden or large changes in the mineralisation of an
area may produce a signal from the detector. Usually this
signal is very broad and often only present in one direction.
Large Deep Targets
Big gold or large relics at
depth produce a much
different response to the
smaller shallower pieces.
The signal is often quite
broad, and there is very
little pitch variance.
False Signals
If false signals are occurring
as you sweep the coil, check
that they are not produced
by any metal that you are
carrying, such as your pick,
battery or steel toe boots.
Move the coil closer, and
then further away from
your body, in order to check
if the signals are coming
from these items. If they
are, increase the distance
between the coil and
these items.
Avoid carrying metallic
objects in your pants
pockets as these are too
close to the coil.
The GPX Series are supplied with the 11” Double D coil. This
coil has an excellent combination of depth, sensitivity and
stability. It also works well with the Iron Reject function.
In addition to this there are also a number of other coils
available to give improved performance to your detector.
These range from smaller coils which give greater sensitivity
to small targets, are lighter and more manoeuvrable in heavy
vegetation, up to larger coils which give greater depth and
improved ground coverage.
10” x 5” Elliptical Double D
This is the coil every prospector and treasure hunter should
carry as its versatility is endless. Great in thick scrub vegetation,
heavy mineralisation and high trash, it has superb sensitivity
and surprising depth for such a small coil. It is also great for
pinpointing deep targets found with one of the larger coils,
and is extremely stable in all soils.
15” x 12” Semi-Elliptical Double D
This coil has greater depth and ground coverage than the 11”
DD and provides stable operation in all soils. This is a great coil
for all round use in highly variable mineralisation and a lighter,
more manoeuvrable alternative to the 18” DD when seeking
out large targets in heavy mineralisation. Its semi-elliptical
design provides impressive sensitivity for its size.
Monoloop
(Side view)
Monoloop Double-D
Double-D
(Side view)
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