Bobbing - Fisher M-Scope CZ-20 QuickSilver Operating Manual

RECOVERY TOOLS
1. Sand scoops
beachcombers and shallow-water treasure
hunters are available at metal detector outlets.
2. Divers use a variety of recovery tools, depending
on the condition of the sea bed or lake bottom. A
sturdy dive knife will suffice in packed mud or small
rocks. Most divers prefer to use their hands in loose
sand. Professional treasure hunters often use an air
hose fed by a surface compressor to blow away
loose sand, gravel or mud.
3. For land recovery, a sturdy hunting knife with a 5-
inch blade will suffice in most soils. A high quality,
double edged "survival" knife is an even better
choice (and more expensive) because it will be
almost impossible to bend or break.
CAUTION: Using a jack knife without a locking
blade is a good way to lose a finger.
4. A heavy duty, blunt screwdriver is commonly used
for shallow targets where digging or "plugging" is
objectionable.
designed especially
GROUND BALANCING
for

BOBBING

1. AUTOTUNE and the SENSITIVITY control is set so you
2. Lower the coil an inch or two above the ground
3. Your objective now is to adjust the GROUND control
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can just barely hear a threshold hum. Hold the
search coil parallel to and 6 to 12 inches over the
ground and at least 3 feet away from any metal
objects. Do not use the PINPOINT button during any
part of this procedure.
and then quickly raise it. Note that as you lower
the coil, the tone disappears then gets louder as
you raise it and finally returns to normal when you
stop it 6 to12 inches above the ground. Conversely,
if you set the GROUND control to "1," the threshold
hum will get louder as you lower the coil and
disappear when you raise it.
so that there is no change, or only a minimum
change in the threshold hum, as you move the coil
up and down. Start by lowering the GROUND
control to "9." Lower the coil and raise it again.
One of three things will happen to your theshold
hum:
a) It will fade again as you lower the coil and
increase as you raise it. Continue to lower the
ground balance setting in small increments until
the threshold hum remains the same (or changes
very little) as the coil is lowered and raised.
b) lt will get louder as you lower the coil and go
silent as you raise it. You have gone past the
correct ground-balance setting. Increase the
ground-balance level (rotating the control
counterclockwise) in small increments until there
is little or no change in the threshold level.
c) The hum will remain the same, or if it changes
slightly, the change is the same whether you
lower or raise the coil. Your CZ-20 is properly
ground balanced, and you are ready to begin
your search.
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