Whites Spectra VX3 User manual

White’s Electronics, Inc.
Sweet Home, Oregon USA
Building the World’s Finest
metal detectors for over 60 years.

Congratulations! You have pur-
chased a quality instrument that
was designed and manufactured in
the USA.
The Spectra series is the result of years of research and develop-
ment, time-proven manufacturing and testing techniques, and,
most of all... listening to our customers.
The Spectra VX3represents the state-of-the-art in metal detect-
ing technology. Three frequencies, color display, advanced fea-
tures, and the ability to use wireless headphones produce a
powerful and capable detector. VX3has preset programs devel-
oped and refined by experts, leaving you ready to find what oth-
ers have left behind.
This instruction manual covers the features of VX3 and intro-
duces the detecting basics you need to get started. There are no
substitutes for field experience; study this manual, and practice
using your Spectra VX3. Before long, you may well be teaching
the experts a thing or two.
I am proud of the Spectra VX3, and the people here at White’s
who designed and built it for you. We’ve been designing, build-
ing, and distributing world-wide for over 60 years from our fac-
tory in Sweet Home, Oregon, USA. We put our “Made in
America” label on every metal detector we build!
Happy Hunting!
President
White’s Electronics, Inc.

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Spectra VX
3
User’s Guide
VX3Specifications
Operating mode . . . . . . . . . . . . . . . . . . VLF/induction balance
Frequencies . . . . . . . . . . . . . . . . . . . 2.5kHz, 7.5kHz, 22.5kHz
Ground balance range. . . . . . . . . .Ferrite to salt (approx. 95°)
Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8, all modifiable
Discrimination segments . . . . . . . . . . . . . . . . . . . . . . . . . 191
Audio modes . . . . . . . 4: Std, all-metal, mixed mode, pinpoint
Audio tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 or 191
Audio output . . .Speaker, headphones, wireless headphones
Display . . . . . . . . . . . . . . . . . . . .320x240 QVGA Color, backlit
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.3 lbs
Length. . . . . . . . . . . . . . . . . . . . . . 45 - 52.5 inches, adjustable
Search coil . . . . . . . . . . . . . . . . . . Eclipse 950 9.5” concentric
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (8) AA, alkaline
Battery life . . . . . . . . . . . . . . . . . . . . . . . . . 8-10 hours typical1
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . 2 years, transferrable
Customer Support
Questions concerning your VX3? There are three ways to con-
tact us:
Internet: http://whiteselectronics.com/support.html
Phone:
1-800-547-6911 (US) (0044) 1463 223456 (UK)
Or mail us:
White's Electronics White's Electronics
1011 Pleasant Valley Road 35 Harbour Road
Sweet Home, OR 97386 Inverness, Scotland
IV1 1UA
1. Alkaline batteries, backlight off, no wireless headphones

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Spectra VX
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User’s Guide
Table of Contents
1Introduction
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
The Basics of VLF Operation . . . . . . . . . . . . . . . . 1-7
2QuickStart
Turn On & Go . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Programs and Memory . . . . . . . . . . . . . . . . . . . . 2-2
Ground Balance . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Electromagnetic Interference (EMI) . . . . . . . . . . 2-4
Menus & Controls . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Live Control Bar . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
VX3Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Search mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Pinpoint mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
VX3Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Metal Detecting Basics . . . . . . . . . . . . . . . . . . . . . 2-8
3 Basic Settings
Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Rx Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
All-Metal Sensitivity. . . . . . . . . . . . . . . . . . . . . . 3-5
Discrimination Sensitivity . . . . . . . . . . . . . . . . . 3-6
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Ground Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

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Spectra VX
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4Operating Modes
Frequency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Three Frequency . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Salt Compensate . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Single Frequency . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Frequency Offset. . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Ground Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
AutoTrac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
LockTrac. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
All-Metal Audio . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Discrimination Audio . . . . . . . . . . . . . . . . . . . . 4-10
Mixed-Mode Audio . . . . . . . . . . . . . . . . . . . . . 4-12
Pinpoint Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Speaker and Headphones . . . . . . . . . . . . . . . . . . . 4-15
Preset Icon Tables . . . . . . . . . . . . . . . . . . . . . . . . 4-16
5Display Screens
Search screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
VDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Depth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
SpectraGraph . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
Status Bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Pinpoint Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Salt Mode Anomaly . . . . . . . . . . . . . . . . . . . . . . 5-9
6Advanced Features
Main Menu. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Filters & Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Ground Filter. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Recovery Delay. . . . . . . . . . . . . . . . . . . . . . . . . . 6-4
SAT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Sensitivity Probe . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5
Ground Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

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Spectra VX
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User’s Guide
7 Programs
VX3Memory Structure. . . . . . . . . . . . . . . . . . . . . . 7-1
Saving Programs . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Restoring Programs . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Rearranging Programs . . . . . . . . . . . . . . . . . . . . . . 7-3
8Wireless Headphones
9Troubleshooting
10 Shortcuts
Back Cover: Warranty; Code of Ethics

Page 1-1
CHAPTER
White’s VX3represents the latest technology in metal
detecting. The heart of VX3is a high-performance ARM-9
RISC microprocessor which simultaneously analyzes signals
from 3 transmitted frequencies. Those frequencies — 2.5kHz,
7.5kHz, and 22.5kHz — were chosen for their diverse
responses to a variety of metal targets, resulting in a superior
system of target analysis and identification.
The face of VX3is a stunning 320x240 color display with an
easy-to-use menu-driven interface. Along with three frequen-
cies, there are three search modes and a three-level Spectra-
Graph®display which provides detailed target information for
each frequency. With a level of simplicity for the novice user
and advanced features to satisfy the experienced user, VX3is a
metal detector for everyone.
This manual is organized to provide progressive informa-
tion, a format that attempts to minimize information overload.
If you are a new detectorist, the QuickStart chapter will allow
you to get a quick jump on using VX3. Then, as you run across
new features and want to find out more, continue reading the
manual to get progressively detailed information.
If you are already familiar with high-end detectors (espe-
cially those with a menu interface), you might want to read over
the QuickStart chapter to get a feel for VX3’s features. VX3’s
graphical interface makes the rest easy.
While VX3is easy to use, it does have more features than
many other detectors, and can appear overwhelming. Don't be
intimidated! Start with the preset programs and go at your own
Introduction
1

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Spectra VX
3
User’s Guide
pace. There is no need to master all the features to get excellent
performance.
If you need help, White's Electronics is a phone call or
mouse click away. Your dealer is an excellent resource, and the
White’s web site has a VX3help forum for questions & answers,
tips, and sharing programs. Go to www.whiteselectronics.com
and click on the Forum link. There are also many other on-line
forums for metal detecting where you can chat with other
White’s users and ask questions. Finally, look for a detecting
club in your area. Members are often eager to help people get
started, and there is nothing like having that help close by in the
field.
Conventions
In discussing the features of VX3, we will use Arial-Bold-
Caps to distinguish keypad buttons and menu selections. For
example, “press ENTER” means to press the “Enter” key on the
keypad, and “select Enable” might mean to select the “Enable”
menu option, probably by using the arrow keys to highlight it
and then pressing ENTER. VX3keys and menus work just like a
modern computer graphical interface, so things are fairly intui-
tive.
In some cases, you need to use multiple key combinations,
or combinations with the trigger switch. “Press MENU, ENTER”
means to press and release the MENU button, then press and
release the ENTER button. But “press MENU+ENTER” means to
press and hold the MENU button, and while holding it down
press the ENTER button. Order often matters, so MENU+ENTER
is not the same as ENTER+MENU. If you find that you have acci-
dentally pressed the wrong key or key combo, pulling the trig-
ger switch will usually back you out.
Tip: Keypad buttons usually take you into menus, trig-
ger gets you out.

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Spectra VX
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User’s Guide
Two keypad buttons have dual names. MENU/TAB is used
both as an entry button into the menu system, and to “tab” from
one screen area to the next. This tab method is identical to how
a PC interface uses it. So in some cases we will tell you to press
MENU, in other cases press TAB. It’s the same button. ZOOM/
VIEW works the same way. VX3also has four arrow keys, and
these may be either called UP DOWN LEFT RIGHT (or UP DN LT
RT) or represented with the symbols  . Any of these
representations might be used.
Most menus are nested, so instead of telling you to press
MENU, then select the Audio menu, then select Search Audio,
then select Discrimination, then select Modulation, we may
instead say, select MENUAudioSearch AudioDiscrimina-
tionModulation. This means to drill down through the stated
menu path.
Finally, there is a trigger switch under the pod. It has a nor-
mal (center) position, a forward position, and a momentary
pulled position. When we say “pull the trigger,” we mean to
pull it to the momentary position and release it. If we say “Pull/
hold the trigger,” then pull it back and hold it there. This might
be in conjunction with a key press, such as, “Pull/hold the trig-
ger and press ENTER,” which is the same as “Trigger+ENTER.”
Layout
The VX3interface consists of a keypad and a color screen.
The next page has a picture of the pod face with the default lay-
out for the search screen. The search screen has four major
regions:
1. Target information
2. SpectraGraph
3. Status Bar
4. Live Control Bar
The target information includes the “VDI” number, the depth,
and icons representing the likely target. SpectraGraph displays

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Spectra VX
3
User’s Guide
signal strength versus VDI and gives a detailed look at the VDI
response. The status bar shows a few operational pieces of
information, and the Live Control Bar provides quick on-the-fly
access to operating modes and adjustment parameters. All of
these will be covered in detail in subsequent chapters.
Target VDI
Icons
Target
Depth
Spectra
Graph
Live
Control
Bar
Disc.
Mask
Status
Bar
Toggle Switch
(front of handle)
Navigation
Keypad

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Spectra VX
3
User’s Guide
Assembly
1. Remove all parts from the shipping carton. Check the
assembly page to ensure all parts are present.
2. Insert the 2 rubber washers (b)
into the recesses of the lower rod
clevis and use the fiber bolt and
thumb nut to secure the search
loop to the lower rod.
3. Insert the lower rod into the “S”
rod (unlock the cam lock if necessary); the spring clip but-
tons will click into the adjustment holes. Turn the cam lock

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Spectra VX
3
User’s Guide
to secure. The second or third adjustment holes are suitable
for average height adults. Exceptionally tall users may wish
to consider purchase of the “tall-man” lower rod (500-0242-
3) and/or the “tall-man” S-rod (500-0240-1).
4. Wind the search loop cable around the rod assembly, first
revolution starting over the top of the rod. Work your way to
the top of the S-rod. Use the Velcro retainers, one near the
loop and one near the top, to hold the cable in place.
5. Insert the rod/loop assembly into the control box rod
(unlock the cam lock if necessary); the spring clip buttons
will click into the holes. Turn the cam lock to secure. Nor-
mally, the S-rod should curve upward.
6. Two adhesive black foam pads are included; they can be
placed on the insides of the arm cup.
7. Adjust the Velcro arm strap so that you can easily slip your
arm in and out. The strap provides extra leverage and con-
trol, though some prefer not to use it.
8. Install the battery pack (see next section for details).
9. Hold the detector normally and check for comfortable angle
and balance. Adjust the lower rod extension and/or the arm
cup position if necessary.
Batteries
VX3is provided with an 8-cell AA battery pack. For best
results, use either alkaline batteries or high-capacity recharge-
able (such as NiMH) batteries. Also available from White’s is a
NiMH rechargeable pack plus recharging station; contact your
dealer or White’s directly for details.
To install the batteries:
• Release the battery door latches on VX 3to open the battery
door.
• Slide the battery pack in, with the metal contact plates facing
forward.

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Spectra VX
3
User’s Guide
To replace the batteries, slide open the battery holder lid by gen-
tly lifting the tab.
A fresh set of alkalines will operate VX3 for about 7-8 hours
with no backlight. Use of the backlight will reduce battery life.
When you first power-up VX3 a start-up screen will display
briefly with the battery voltage at the bottom. During operation,
if the battery voltage drops below 8 volts a low-battery icon will
display in the status bar:
You can also check the voltage at any time by selecting Back-
light,VIEW from the Live Control Bar, or pressing
MENU+ENTER to bring up the Info screen.
VX3automatically powers off if no activity occurs in a 20
minute time span. Activity is defined as the use of the keypad or
the trigger switch.
The Basics of VLF Operation
VX3is a multi-frequency (MF) induction-balance (IB) very
low frequency (VLF) transmit-receive (TR) metal detector. In
order to understand what all the user adjustments do, it is
important to have at least a rudimentary understanding of how a
modern metal detector works.
Metal detectors work on the principle of induction, discov-
ered by Michael Faraday in 1831. The typical induction-balance
metal detector1uses a transmit coil to produce a magnetic field,
and this magnetic field in turn produces a small reaction in
nearby metal targets. A receive coil is used to detect this small
1. The first practical metal detector was an induction-balance
design, built by Alexander Graham Bell in an effort to locate an
assassin’s bullet lodged in US President James Garfield. He
failed — not enough sensitivity. Ever since then, “more sensitiv-
ity” has been the goal of every detector.

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Spectra VX
3
User’s Guide
reaction. A so-called “induction-balanced” coil arrangement
prevents the receive coil from being overwhelmed by the trans-
mit signal, allowing it to see very small target signals.
Phase & VDI
Practically all VLF-IB detectors operate as phase discrimi-
nators. The received signal is converted to phase, and the phase
is a strong indication of what the target might be. The particular
phase of a target can vary with the frequency of the transmitted
signal, so different detectors designed to use different frequen-
cies can report completely different phase results.
To keep users from having to learn all these different phase
response scales, White’s has chosen to normalize them all to a
standard “VDI” scale. VDI stands for Visual Discrimination
Indicator and is simply a consistent numerical value assigned to
targets regardless of the frequency being used. Therefore, a US
nickel detected with a 6kHz detector will have the same VDI as
with a 15kHz detector. For historical reasons, the standard VDI
scale is based on a 6.592kHz detector and is shown below.
The ability to separate targets by VDI is what allows a
detector to discriminate. Targets with a negative VDI are usu-
ally ferrous (iron), and targets with a positive VDI are usually
non-ferrous. Small gold tends to have low VDI’s while thick sil-
ver coins have high VDI’s. Other targets like cupro-nickel
coins, brass and bronze relics, and aluminum trash can have
wildly varying VDI’s depending on their alloy, size, and thick-
TX RX

Page 1-9
Spectra VX
3
User’s Guide
ness. This means you need to apply your own discriminator —
your brain — in deciding what the VDI responses are telling
you.
Ground Response
Unfortunately, buried metal is not the only thing the detec-
tor sees. Most soil contains ferric oxide minerals, and this min-
eralization looks like a target2. In terms of VDI, practically all
ground mineralization falls in the extreme negative range of the
scale, even beyond most iron targets. But it can vary somewhat
as shown by the gray range in the prior diagram. At most loca-
tions the variation is small, so you can ground balance at a par-
ticular spot and be very close for the entire area. Some locations
have significant variations and you should occasionally re-
ground balance as you hunt, or use automatic ground tracking.
Many locations have enough mineralization to create quite a
strong ground signal, often much stronger than that of a moder-
ately deep target. The VDI diagram on the preceding page uses
vectors to represent specific target responses, with the angle of
the vector representing the VDI value. We can also use the
length of the vector to represent the strength of the target
2. In this manual, we’ll refer to the signal resulting from ground
mineralization (including salts) as the “ground signal” or the
“ground response.”
0o
90o
-95 180o +95
0
R
a
w
P
h
a
s
e
V
D
I
S
c
a
l
e
R
a
w
P
h
a
s
e
V
D
I
S
c
a
l
e
Ferrous Non-Ferrous
Normalsoil
Salt
USQuarter
USNickel
Nail

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Spectra VX
3
User’s Guide
response, so that a strong ground and weak quarter response
would look like:
The detector will see both signals at the same time, and the
combination of the two can be represented with a third vector as
follows:
The resulting signal appears to be a fairly strong ferrous tar-
get instead of a quarter. This is the downfall of the old TR-dis-
criminator designs. Fortunately, since the VDI response for
ground is usually far away from the response of desirable tar-
gets, there are ways to deal with it. In a modern VLF motion
discriminator, the receiver determines what part of the signal is
the ground response and, using special filter techniques, nor-
malizes the whole VDI scale to the current ground signal,
resulting in the ground signal being ignored. Graphically, this
looks like:
WeakQuarter
StrongGround
-95 +95
0
WeakQuarter
StrongGround
-95 +95
0
ResultingSignal

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Spectra VX
3
User’s Guide
Any error in the ground balance point can result in an error in
the target VDI response so it’s important to maintain a decent
ground balance point.
Ground Tracking
In order to better handle variations in ground mineraliza-
tion, many detectors now incorporate automatic ground track-
ing (White’s uses the term AutoTrac®). The detector attempts to
determine what part of the signal is due to ground and continu-
ously track the phase and strength of that signal, and eliminate
it. One trick is to limit the range of VDI’s for normal ground
(the grayed area in the VDI scale) and consider anything else a
target. This works for most soils, with two caveats.
Besides “normal” ground mineralization, some areas con-
tain rocks or small pockets consisting of material with slightly
different mineralization than the surrounding ground. The dif-
ference in VDI between these anomalies and the surrounding
ground isn’t enough to consider them a true target, but they are
small enough to act like a target to the detector’s ground filters.
These so-called “hot rocks” can create annoying responses in
many detectors.
Another situation concerns soils with significantly conduc-
tive salts. A pure salt response lies all the way in the non-fer-
rous region of the VDI scale, roughly in the midst of foil. Some
salt-water beaches are close to having a pure salt VDI, while
other beaches include black sand mineralization that creates a
WeakQuarter
-95 +95
0
New Origin
StrongGround
-95 +95
0

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Spectra VX
3
User’s Guide
composite VDI that can land anywhere between pure ferrite
(VDI = -95) and pure salt. Other areas, like fertilized fields with
residual salt ions, can also have a composite ground response.
Many deserts have a layer of surface salts that have been
leached from the soil; this is generally not a problem as long as
it is dry.
Frequency
Metal detectors are produced using a wide range of trans-
mitted frequencies, from 1kHz up to around 100kHz, though
the vast majority fall in the VLF range of 3kHz - 30kHz. Low
frequencies usually favor thicker targets and metals of higher
conductivity, while high frequencies favor thin and low-con-
ductive targets.
Low frequencies also do a better job penetrating ground
mineralization, including salt. High frequencies tend to gener-
ate stronger ground and salt signals which can limit the ability
to distinguish weak targets. Obviously, when trying to detect
thin low-conductive targets (like nuggets and jewelry) in harsh
ground (like wet salt sand or black sand) there are competing
frequency requirements, so a compromise is necessary. With the
ability to run 3 simultaneous frequencies or any one of them
individually, VX3has the ability to deal with a wide variety of
conditions.
Interesting Experiment: Thickness matters because of a
phenomenon known as skin effect. To demonstrate this,
cut several identical flat squares (say, 1”x1”) of aluminum
foil. Test the VDI response of a single square, and see how
the VDI varies as you stack more squares (tightly)
together.

Page 2-1
CHAPTER
Turn On & Go
VX3is highly programmable and includes several factory
preset programs which provide good overall performance and
allow a new user to quickly start hunting.
1. Press ON/OFF: VX3briefly displays a start-up screen, and
after 2 or 3 seconds goes straight to the search screen:
2. At the bottom of the screen is the Live Control Bar, which
gives you direct access to most of VX3’s settings. The first
item is Program Select; if you highlight this and press
ENTER you will see a pop-up selector listing all the avail-
able programs:
QuickStart
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Spectra VX
3
User’s Guide
Select a desired program, pull the Trigger, and VX3is ready
to start hunting.
Programs and Memory
VX3has 8 preset factory programs:
•Coin- Accepts most common US coins, including nickels.
Most other VDI regions, including where most jewelry is
found, are rejected.
•Coin & Jewelry - Accepts most common coins, along with
rings and jewelry.
•Salt Beach - Coin & Jewelry using salt subtraction mode.
•Relic - Mixed mode, no Tone ID, no VCO.
•Prospecting - All-metal mode optimized for nugget hunting.
•Deep Silver - Optimized for deep silver.
•Hi-pro - Advanced Coin & Jewelry.
•Demo - Extra program for whatever you want. Factory set-
tings for this program are weak, intended for in-store demos.
These programs are designed for good performance under most
conditions and provide an excellent starting point. However,
ground conditions vary considerably, so some adjustments may
be necessary. Changes to factory programs are automatically