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15

TARGET DISPLAY and AUDIO

SIGNAL Indicator

The lower-left bargraph designates
SIGNAL strength only when operating in
Discrimination mode.
The signal strength indicator at the bottom-
left of the screen indicates how large or
close the buried metal target is.

If all bars are illuminated, the target is

large or close to the searchcoil.

If one or two bars are illuminated, the

target is far away or small, or both.

DEPTH Indicator

When operating in Discrimination mode, a
target’s location and size can be verified
using the PINPOINT control.
Press PinPoint to temporarily detect metal
without searchcoil motion, and a
monotone hum.

While holding the PinPoint button, the

DEPTH indicator will appear.

The

number beneath DEPTH represents the
distance of the object, in inches, from the
searchcoil. The Depth scale is calibrated
to coin-sized objects. For objects other
than a coin, the numeric value is a relative
measure of the target’s depth.

AUDIO FEEDBACK

When a target is detected, the Gold Bug will
respond with two types of sound:

1. V.C.O., or

Voltage Controlled

Oscillator, is an audio response
with variable pitch and volume.

2. A LOW tone beep.

In Discrimination mode, targets which fall

into the zone along the arc whose
segments are shaded will be identified
with a LOW tone beep and solid segments
with V.C.O. tones.

As the user sets the discrimination level

with the 

+

and 

-

buttons, he is determining

which targets will induce the low tone, and
which will be eliminated.

All targets’ audio responses in All-Metal

mode will be V.C.O..
V.C.O., or Voltage Controlled Oscillator, is
an audio response which provides a good
feel for the target.

The stronger the target signal, the higher
the volume and the higher the audio pitch.
Very weak signals will have the faintest
volume and lowest pitch.
For this reason, the use of headphones
is always recommended for detecting the
smaller and deeper targets.

2-DIGIT TARGET INDICATOR

In Discrimination mode the 2-digit target
indicator, in the middle of the screen,
provides a specific target value to help
identify buried targets more accurately.
With practice in the field, you will learn to
associate target values with the probable
identification of buried objects. The target
value can vary each time the searchcoil
passes over the target, depending upon
the orientation of the object and its
distance from the searchcoil.
As a starting point, refer to the table below.

T

T

A

A

R

R

G

G

E

E

T

T

 

 

R

R

e

e

a

a

d

d

o

o

u

u

t

t

The table below lists some common
approximate target values. With
experience in the field, you will
recognize many types of metal
objects by their numeric value.

O

O

B

B

J

J

E

E

C

C

T

T

T

T

A

A

R

R

G

G

E

E

T

T

 

 

I

I

.

.

D

D

.

.

foil from gum wrapper

40 - 55

U.S. nickel (5¢ coin)

typically 58

aluminum pull-tab

60 - 75

aluminum screwcap

70 - 80

zinc penny (dated after 1982)

typically 78

aluminum soda pop can

75 - 85

copper penny, clad dime

typically 83

U.S. quarter (25¢ coin), clad

typically 89

50¢ coin, modern clad

typically 92

old silver dollar coin

typically 94 

US silver Eagle $1 coin

typically 95

Caution:

The target indications are

visual references. Many other types of
metal can also be represented by a given
target I.D.

2. + and -

a. In Discrimination mode, 

+

and 

-

change the level of discrimination (target

rejection)

b. In All-Metal mode, 

+

and 

-

provide a manual override to the Ground Balance

Setting.

CONTROL PANEL

GAIN versus THRESHOLD

“Gain” increases, or multiplies, the strength of signals from buried metal objects.
For maximum detection of the smallest or most deeply buried objects, increase
the Gain.  To minimize the weakest signals, reduce the Gain.
“Threshold” controls the detector’s audio level. Positive threshold values
amplify the audio response of weak target signals. Negative threshold
values suppress sensitivity.

For searching at maximum sensitivity, first set the gain at a low level. Then
set threshold into the positive region, with a comfortable background-hum
volume level.  Then increase Gain to a comfortable level, free of chatter.

For silent searching, set threshold to a negative number, and also reduce
Gain if necessary.  Silent searching will result in the loss of some sensitivity.

TOUCHPAD CONTROLS

1. GG / PINPOINT

This button has a dual function, depending on the detection mode.

a. In DISC mode, press-and-hold the button to activate PINPOINT. 

Pinpoint temporarily engages a no-motion detection mode. Searchcoil
motion is not necessary to detect metal. Any metal within the searchcoil’s
detection field will induce a sound.  Pinpoint is generally used to verify a
target previously detected in Discrimination mode.  

b. In ALL-METAL mode, press-and-hold the button to activate GROUND GRAB.  

Ground Grab allows you to set the detector’s internal ground setting equal
to the phase of the ground you are searching over.  See the section on
Ground Balancing for a more thorough explanation of this feature and the
reason for using it.

 

 

 

 

 

 

 

           

 

 

          

   

 

         

 

 

 

 

 

Summary of Contents for Gold Bug DP

Page 1: ...its all FCAP Replacement Accessory Search Coils 11 DD Standard Coil 11COIL GB 199 95 5 DD Accessory Coil 5COIL GBUG 159 95 Coil Covers Specially made to protect your coil from abrasion and damage 11 D...

Page 2: ...2 39...

Page 3: ...Objects 12 EMI 12 Operation and Controls 13 Control Panel 13 Control Knobs Off On Gain 14 Disc All Metal Threshold 15 Touchpad Controls GG Pinpoint 15 and 15 Operating in All Metal Mode Ground Grab G...

Page 4: ...adio peut fonctionner avec une antenne d un type et d un gain maximal ou inf rieur approuv pour l metteur par Industrie Canada Dans le but de r duire les risques de brouillage radio lectrique l intent...

Page 5: ...fferent tones for different types of metals and when the detector eliminates certain metals we refer to this as the detector discriminating among different types of metals Discrimination is an essenti...

Page 6: ...d dispose of any and all trash and litter found Appreciate and protect our inheritance of natural resources wildlife and private property Act as an ambassador for the hobby use thoughtfulness consider...

Page 7: ...ovided one on the Lower Stem close to the Searchcoil and one on the Upper Stem close to the housing Leave just enough slack in the Cable at the Searchcoil end to be able to rotate the Searchcoil a sma...

Page 8: ...ndicator at the bottom of the display indicates the battery condition The detector requires a single 9 volt ALKALINE battery Do not use ordinary zinc carbon batteries Do not use Heavy Duty batteries R...

Page 9: ...rface Never swing the searchcoil like a pendulum WRONG CORRECT QUICK START DEMONSTRATION I Supplies Needed a Nail a Zinc Penny dated after 1982 a Nickel a Quarter II Position the Detector a Place the...

Page 10: ...termittent nature than electrical interference The second most common cause is a loose searchcoil connector The noise from a loose connector will usually be very erratic or intermittent in nature Try...

Page 11: ...ect metal detectors Overall the potential for electromagnetic interference is greater than it was just a few years ago Modern high end metal detectors are a lot more sensitive than older units this al...

Page 12: ...always carry a magnet to help discriminate gold from hot rocks and iron Gold will not be attracted to a magnet Pieces of iron will always be attracted to a magnet Negative hot rocks will almost alway...

Page 13: ...e gold areas a lot of the terrain is under claim so you need to learn how to recognize posted claims and stay off of them unless you have the claim owner s permission Prospecting clubs such as the Gol...

Page 14: ...e the loss of sensitivity resulting from discrimination is enough to cause those little nuggets to vanish If you have gone many hours without finding gold and are wondering if there is something wrong...

Page 15: ...nd its distance from the searchcoil As a starting point refer to the table below T TA AR RG GE ET T R Re ea ad do ou ut t The table below lists some common approximate target values With experience in...

Page 16: ...sed to find all types of metal objects in the ground The searchcoil must be in motion for objects to be detected Ground Grab GG Naturally occurring minerals in soil look like metal to a metal detector...

Page 17: ...g it difficult to know where it is located It will not have the sound and feel of a metal object GROUND BALANCING Reading the Display Most gold prospecting and relic hunting is done by ear Listen for...

Page 18: ...ll be achieved by first performing the GG procedure in All Metal mode The ground balance setting achieved using GG will carry over into this mode Setting the Controls As you adjust any of the controls...

Page 19: ...increase with target strength The approximate target depth in inches will be indicated in the center of the screen The depth scale is calibrated to coin sized objects Relative depth is indicated for l...

Page 20: ...20 will NOT BE DETECTED Values from 20 to 49 will induce a LOW tone Values from 50 to 100 will induce V C O tones see p 25 Suggestion Try changing the settings watch the screen and pass objects over t...

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