Table of Contents
Advertisement
BATTERIES
T
w
o
9
-
V
o
l
t
b
a
t
t
e
r
i
e
s
T
w
o
9
-
V
o
l
t
b
a
t
t
e
r
i
e
s
a
r
e
s
u
p
p
l
i
e
d
w
i
t
h
a
r
e
s
u
p
p
l
i
e
d
w
i
t
h
t
h
e
F
4
.
t
h
e
F
4
.
The batteries have
been inserted
backwards in the
compartment for
storage during
transportation.
Please remove
batteries, turn them
around, and install
correctly.
A
L
K
A
L
I
N
E
Use A
L
K
A
L
I
N
E
batteries only.
D
o
n
o
t
m
i
x
o
l
d
a
n
d
n
e
w
D
o
n
o
t
m
i
x
o
l
d
a
n
d
n
e
w
b
a
t
t
e
r
i
e
s
.
b
a
t
t
e
r
i
e
s
.
To install the batteries:
1
1
Remove the battery cover by disengaging the clip at the back.
Do not hinge door upward; pull straight back
2
2
Align the polarity of the batteries correctly, with the positive "+"
toward the coil plug connection, as indicated by the + and –
indicators on the housing.
3
A
L
K
A
L
I
N
E
3
Insert (2) 9-Volt A
L
K
A
L
I
N
E
batteries, with the contacts pointed inward,
and press down on the back of the batteries to snap them into place.
Some brands of batteries will require moderate force to clear the
retaining tabs.
4
4
Replace the battery door.
Most metal detector problems are due to improperly installed
batteries, or the use of non-alkaline or discharged batteries. I
d
e
t
e
c
t
o
r
d
o
e
s
n
o
t
t
u
r
n
o
n
,
p
l
d
e
t
e
c
t
o
r
d
o
e
s
n
o
t
t
u
r
n
o
n
,
p
l
HEADPHONE JACK
Using headphones (not supplied)
with your metal detector makes it
easier to identify subtle changes in
the threshold levels for better
detection results, and also reduces
drain on the batteries. Any stereo
headphone with 1/4" jack will work.
4
4
e
a
s
e
c
h
e
c
k
t
h
e
b
a
t
t
e
r
i
e
s
.
e
a
s
e
c
h
e
c
k
t
h
e
b
a
t
t
e
r
i
e
s
.
SENSITIVITY ADJUSTMENT
ELECTROMAGNETIC INTERFERENCE
Use the Sensitivity Control is to eliminate
Electromagnetic Interference (EMI).
The F4 metal detector is an extremely sensitive
device; the search coil creates its own
magnetic field and acts like an antenna. If
your detector beeps erratically when the
search coil is motionless, the unit is probably
detecting another electromagnetic field.
Common sources of EMI are electric power lines, both suspended and buried,
motors, and household appliances like computers and microwave ovens.
Some indoor electronic devices, such as dimmer switches used on household
lighting, produce severe EMI and can cause the detector to beep erratically.
Other metal detectors also produce their own electromagnetic fields; so if
detecting with a friend, keep two metal detectors at least 20 feet apart.
-
If the detector beeps erratically, R
S
e
n
s
i
t
i
v
i
t
y
-
S
e
n
s
i
t
i
v
i
t
y
Pad on the left of the control panel.
In most urban environments, you should be able to search without chatter from
interference at the default sensitivity setting (default setting is the sensitivity level
at power-up, 4 bars), or at one level reduced from default. At maximum
sensitivity, the F4 will "chatter" in proximity to underground or overhead power
lines, or to indoor or outdoor electrical devices. In fact, if you notice rapid
chatter with the searchcoil near the ground, you may be able to trace the
approximate location of the underground power lines by following the chatter.
To manage chatter, which is most likely from electrical interference:
1
.
R
E
D
U
C
E
1
.
R
E
D
U
C
E
2
.
2
.
Try sweeping it over the ground.
If the F4 chatters while held still, or held up in the air, it may be much
quieter when sweeping over the ground.
3
.
3
.
Operate in AUTOTUNE mode
I
f
t
h
e
f
t
h
e
Interference is much more tolerable in this mode, even at high sensitivity.
SEVERE GROUND CONDITIONS
A secondary use for the Sensitivity Control is to reduce false detection signals
caused by severe ground conditions. While the detector contains circuitry to
eliminate the signals caused by most naturally occurring ground minerals, 100%
of all ground conditions cannot be anticipated. Highly magnetic soils found in
mountainous and gold-prospecting locations can cause the detector to emit
tones when metal objects are not present. High saline content soils and sands
can sometimes cause the detector to beep when no metal target is present.
If the detector emits false, non-repeatable, signals, REDUCE THE SENSITIVITY.
R
E
D
U
C
E
T
H
E
S
E
E
D
U
C
E
T
H
E
S
E
t
h
e
S
E
N
S
I
T
I
V
I
T
Y
t
h
e
S
E
N
S
I
T
I
V
I
T
Y
until the chatter stops.
N
S
I
T
I
V
I
T
Y
N
S
I
T
I
V
I
T
Y
by pressing the
1
7
1
7
Advertisement
Table of Contents
