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WHITE'S ITALIA

VIA PEDIANO 3A

40026 IMOLA ITALY

www.whitesitalia.com 

The MXT series, which by design marry “versatility & high performance” with “simplicity of use”, is a wildly

successful metal detector design. I’m proud to put my name on the MXT Pro. As well, I’m proud the MXT

is grouped among a handful of landmark metal detector designs. Among the highest tribute, success in

the fi eld has earned the MXT “benchmark status” for which all other metal detectors are judged.

Listening to successful MXT users, the MXT Pro adds the three things MXT users have been asking

for, Backlight, Multiple Tone ID, and Ground GRAB, a convenient way to update ground tracking from a

locked setting or temporarily lock ground tracking for multiple passes over questionable signals.

This instruction manual will give you a good understanding of the basics. There are no substitutes for fi eld

experience. Practice using your MXT Pro and then study this manual further. Before long, you may well

be teaching the experts a thing or two.

It is with pride we put our “American Made Label” on every metal detector we build. At our facility here in

Sweet Home, Oregon, USA, we’ve been proudly designing, building from scratch, and distributing worldwide,

the world’s fi nest metal detectors for nearly 60 years.

It has always been my philosophy to keep our people in Sweet Home, Oregon working by keeping our

customers happy. I’m proud of our metal detectors and the people here at White’s who build them for you.

Happy Hunting!

President

White’s Electronics, Inc.

5

MXT Pro Table of Contents

Standard Battery Holder..............................................................................................7

Using the Standard Battery Holder..............................................................................7

Battery Check..............................................................................................................7

Optional Accessory Rechargable Battery....................................................................8

Control Summary........................................................................................................9

Gain Control................................................................................................................9

DUAL Control..............................................................................................................9

TRAC Control..............................................................................................................10

Tone Selection............................................................................................................12

Relic...........................................................................................................................12

Display Blocks..........................................................................................................13

VDI Numbers............................................................................................................14

Display Blocks..........................................................................................................14

VDI Numbers............................................................................................................16

6

Trigger (on handgrip)...............................................................................................18

“Music Notes” Tone ID.............................................................................................19

Trigger (on handgrip)...............................................................................................19

Trigger (on handgrip)...............................................................................................20

Concerning All Modes.................................................................................................21

TRAC Toggle...............................................................................................................21

Ground.....................................................................................................................21

MXT Pro Table of Contents

7

Chapter 1 MXT Pro Assembly

Twist and insert each end of

handle (provided) through top

of shipping carton into

second fl ap.

(CARRY CARTON)

WASHERS

BETWEEN EACH

LOOP EAR &

CLEVIS

LOOP OR

SEARCH COIL

CABLE RETAINER

ELBOW

CUP STRAP

CAMLOCK

LOOP

CONNECTOR

CABLE

RETAINER

“S” ROD

LOOP

CABLE

CLEVIS

LOWER ROD

Trigger behind display has multifunction

capability depending

on which of the three

modes you select.

ELBOW CUP

FOAM PADS

INSIDE ELBOW

CUP

8

the assembly page to make sure all parts are present.

fi ber bolt, and thumb nut to secure loop/search coil to

clevis/lower rod.

into curved “S” rod so that stainless steel spring clip

buttons line up and lock into one of the adjustment

holes in the curved “S” rod. Turn camlock to secure.

The second or third adjustment holes are suitable for

average size adults. Individuals 6’ or taller should use

the fully extended position. Individuals well over 6’ tall

should purchase the optional Tall Man Rod.

clevis and rod assembly, fi rst revolution over the top

of the rod. Wind cable all the way to the top of the

curved “S” rod, about fi ve revolutions. Use the black

cable retainers, one near the loop, and one near the

top of the curved “S” rod, to hold the loop cable in

place.

“S” rod so that stainless steel spring clip buttons line

up and lock into the rod on top of the control box. The

“S” rod is designed to curve up toward the display.

However, those who prefer to sweep the loop close to

their feet may desire to assemble the “S” rod to curve

down toward the ground. Turn camlock to secure.

Plug loop connector into control box, screw lock ring

to secure.

the elbow cup with strap secure, and sweep the loop/

search coil over the fl oor. If the instrument fi t feels

uncomfortable, adjust the elbow cup by removing and

repositioning the bolt/thumb nut and installing

in one of the optional positions. If necessary, readjust

clevis/lower rod length with the spring clip buttons so

that the search coil can be held near the fl oor without

requiring stooping over.

elbow cup foam pads. Carefully align pads on the inside

of the elbow cup, one on each side of the center

rod, and press fi rmly into place.

enough for you to slide your arm in and out without

loosening each time you want to set the detector

down. The elbow cup strap provides extra leverage

and control. However, some prefer not to use it.

facing toward inside of battery compartment.

might not work as expected indoors due to the

high degree of metals used in modern construction.

It is best to tune and practice out-of-doors to ensure

stable, predictable results. Additionally, freshly- buried

targets will not produce the normal depth and discrimination

results of targets that have been naturally

lost and settled in the ground. Due to the abnormality

caused by digging a hole in the ground matrix, and

the sophistication of the ground rejection circuitry, it

may take a number of years for freshly buried targets

to respond at true depths and discrimination accuracy.

The best way to determine true detection depth

is in real search conditions.

Chapter 2 MXT Pro Assembly

9

holder) by applying gentle upward pressure on

the tab of the door so that it unlocks. Slide the door

away from the battery box exposing the cell positions.

and (-) positions of each cell and the (+) and (-) for

each position marked inside the cell tray. Install new

If the cells are installed incorrectly, the detector

may require service by an Authorized Service Center.

the decal is facing down, with the battery holder

door tab and metal contact points facing toward the

inside of the battery compartment. Close the battery

compartment door and secure the two latches on the

bottom of the case. Hook the front of each latch fi rst,

and then press down on the rear.

batteries equaling 12 volts total. Alkaline batteries are

recommended for use with this model. During normal

searching conditions you can expect about 40 hours

of hunting time from a quality set of eight alkaline batteries.

When non-alkaline batteries or rechargeable “AA”

cells are used, detecting time (before replacement/

recharge) may be reduced to about 30-35 hours.

display when the Gain is used to turn the MXT Pro

“ON”. Once the batteries become weak (8 volts) “Lo

Bat” will automatically appear on the display during

searching. At that point the batteries should be replaced.

Alkaline batteries provide some reserve time

after “Lo Bat” appears, rechargeable batteries do not.

down on the front of each of the two latches (on the

bottom of the control box) releasing the catch and

hinging open the door.

Headphone use prolongs all battery life. Battery life

will vary a great deal with temperature, number of

target signals, battery type, brand, and shelf life. Alkaline

Batteries may be used (in a pinch) well into the

“Lo Bat” indication. Rechargeable batteries cannot.

When traveling far from home it is always a good idea

to carry 8 extra penlight alkaline batteries with you.

Backlight use will slightly reduce battery life, 10% at

the lowest brightness, 20% at medium, and 30% at

the highest setting.

Chapter 1 MXT Pro Batteries

10

Chapter 2 MXT Pro Batteries

A rechargeable battery system is not standard equipment

with your MXT Pro, however, two different high

quality systems are available.

White’s rechargeable battery #802-5211, and charger

#509-0022 are the recommended standard system

and offer quick charge and overnight charge options.

on 220-240 volt.)

White’s Premium system, #509-0037 NiMH Charger,

#802-5285 NiMH Stand, and #802-5281 NiMH rechargeable

battery offers extended search times, the

latest Nickel Metal Hydride capabilities for the MXT

Pro.

Non-rechargeable batteries will start to drop in

voltage as soon as they are put into use and then

steadily diminish in voltage till they no longer provide

adequate power. The optional Nicad rechargeable

battery pack, however, will diminish slowly (plateau)

in somewhat of a fl at line and then, near the end of

their useful life, very quickly decline. Regardless of

the battery used, for long search periods, backup

cells are always suggested.

Rechargeable batteries deliver fairly constant voltage

until they require a recharge. If you use them well

beyond low, they may be damaged, will deteriorate

more quickly than if you only use them till their voltage

starts to drop signifi cantly. Therefore, rechargeable

batteries should be taken out of service and

recharged as soon as you notice “Lo Bat” on the

display.

Rechargeable batteries (depending upon the type)

may not provide the same amount of continuous use

per recharge compared to “one use life” set of quality

alkaline batteries.

11

Chapter 3 MXT Pro Basic Controls & Quick Start

Three position switch for setting

operating mode. Coin & Jewelry, Relic,

Prospecting.

Turns the MXT Pro ON/OFF and adjusts

the signal strength of targets, ground,

and electrical interference.

In Coin & Jewelry and Relic Modes

establishes the level of trash metal

rejection (Discrimination). In the

Prospecting Mode establishes

Self Adjusting Threshold (SAT),

the speed at which the THRESHOLD

“hum” recovers from the affects of

inconsistencies in ground mineralization.

Three position switch selects Ground Mineral Tracking,

Ground (for most searching), Salt (for salt water beaches

or conductive alkali ground types), or Lock (to Lock

or hold a particular ground setting).

Establishes the slight background sound “faint hum” or

edge of sound that is heard continuously during searching.

Once this edge of sound has been located some

operators prefer to adjust slightly counterclockwise of

it to achieve silent search, no continuous background

hum, during searching.

12

Chapter 3 MXT Pro Basic Controls & Quick Start

Selects different types of variable tone or pitch options.

setting (disable tracking) for multiple search coil passes over a week or small target signal,

thus avoid tracking out such weak target signals.

rejection level to the (continuously monitored) current ground rejection (tracking level). This

update is where the ground rejection would have been had the TRAC control been set to

the Ground or Salt setting continuously. Grab is a far more convenient way to update the

Locked tracking level. Instead of having to reach over and switch TRAC, from LOCK to an

active position, reestablish a usable ground setting, and then switch TRAC back to LOCK.

With GRAB you simply press and release the key right under your thumb, and you have

updated to current ground conditions. Note, last used TRAC position before Locking (Salt

or Ground) determines the ground balance range available to Grab. If Ground was the last

TRAC position used, Grab will grab the best available setting within the Ground Range of

rejection. If Salt was the last used TRAC position, grab will grab the best available tracking

level well into the conductive salt range.

Select and adjust the display backlight level for use in low light conditions. Minor additional

battery life cost.

1. Center (Primary Search)

2. Squeeze and Held (Pinpoint)

3. Forward (Locks Pinpoint)

4. Prospecting Mode Only, Trigger Squeezed

and held, or pushed forward and locked,

temporarily disables ground tracking (same

function as holding Grab)

13

Chapter 3 MXT Pro Quick Start

With the MXT Pro properly assembled and the batteries installed,

follow the instructions below to start fi nding valuables!

normal dirt, Salt position for saltwater beaches or alkali desert

regions when wet.

Search) position.

searching desire, Coin & Jewelry, Relic, or Prospecting.

& Jewelry and Relic Mode or to the SAT ring “Triangle” for the

Prospecting Mode.

Rotate the GAIN control clockwise to “Triangle”.

“hum” (faint sound).

and down 2” - 4” a couple of times and the MXT Pro will balance

or track out the ground mineralization, indicated by a steady

threshold hum.

overlap each other 50% as near the ground surface as possible,

scrubbing grass, a half-inch above rocky or ruff surfaces, listening

for solid repeatable “beeps” over multiple search coil passes.

search coil passes; consult the display information, squeeze and

hold the Trigger switch (on the handgrip) and “+” the area (Coin

& Relic) noting the largest bar blocks and the shallow depth

indicates target center. Dig targets with good sound over multiple

search coil passes, good display indication, and consider (Coin &

Relic) depth as another likely clue as to target value.

or popping) and you are not near common sources of electrical

interference, set TRAC to LOCK and/or reduce GAIN (counterclockwise)

slightly and try again. It is normal to hear minor but

noticeable fl uctuations in the THRESHOLD “hum” as the MXT

Pro tracks out the ground mineralization and rejects trash metals

particularly noticeable at higher GAIN settings.

When operating in the Prospecting Mode, if experiencing

instability false signals fi rst try reducing the Gain and/or increasing

the SAT speed (DUAL Control). SAT speeds as high as HYPERSAT

may be necessary in some ground conditions. If Gain

and SAT adjustments do not smooth performance, then switch to

the TRAC Lock position.

14

Chapter 4 MXT Pro Display

The MXT Pro display and reference label below the display

provide a wealth of information about the metal target.

Important; consult the display information only after a solid

repeatable audio tone “beep” has been located over multiple

search coil passes.

The MODE selection changes both the audio sound presentation

and the type and content of the information shown on

the display, better suiting the MXT Pro to the application,

Coin & Jewelry, Relic, or Prospecting.

In all MODES, upon fi rst turning the GAIN “on” the display

will momentarily show a software version and battery voltage,

followed by the Mode and Tone selection.

Turning off and on, the MXT Pro will always return to the

original factory default Tone selections;

tones depending upon Discrimination control setting, with

iron (if accepted) the lowest pitch and +95 the highest pitch

tone. Press “music notes” to turn ON/OFF Tone ID. When

OFF all accepted targets indicate with the same basic pitch

or tone.

current Discrimination setting) produce a lower pitch tone;

accepted targets (those above current Discrimination setting)

produce a high pitch tone. Press “music notes” Tone ID

to select among two other tone options for the Relic mode;

Iron ID (all iron low tone, all non-iron high tone) Discrimination

Control disabled, or, 1 Tone (above current Discrimination

setting high pitch tone, below discrimination setting

audio suppressed, iron if accepted = low pitch tone).

80% and greater probability of being iron produce a unique

grunt tone. Press “music notes” to turn ON/OFF. When OFF;

all targets produce the same basic VCO audio varying only

upon their size or signal strength.

Backlight will always revert to OFF during ON/OFF cycles.

The MXT Pro operates on a twelve volt battery system.

which with new quality batteries will indicate 12 + volts. During

searching “Lo Bat” will start appearing on the display at 8

volts and anything 8 volts and below are suspect for replacement.

If using rechargeable batteries 8 volts is absolutely

the end of their usable performance. Use after 8 volts can

damage rechargeable batteries and the MXT Pro will not

perform normally. If you are using quality alkaline batteries

you do have a reserve after 8 volts. The MXT Pro utilizes a

low voltage regulator. Quality alkaline batteries will provide

normal performance (in a pinch) well into the Lo Bat indication.

MODE provides 5 different signifi cant indications on the

display.

is a reference number dictated by the metals targets

exact alloy, size, and shape. The reference label below

the display provides a comparison of known targets and

their common VDI numbers. Like targets produce like VDI

numbers. Similar targets produce similar VDI numbers. And

different targets produce different VDI numbers. Different

metal targets, however, may share the same VDI numbers

based on their electrical characteristics. VDI numbers from

-95 to +94 are available and cover the entire range of alloys

and sizes.

15

portion of the display and line up with the indications on the

reference label below the display. It is important to note

these blocks are a different separate opinion compared to

the VDI number and they may or may not agree. There is

signifi cance to how these blocks appear. A full block indicates

the MXT Pro is confi dent of indication. A half block

indicates the MXT Pro is not confi dent but is making an

educated indication. A quarter block indicates the MXT Pro

is not confi dent at all, guessing based on what little information

the target is producing.

in some cases) to indicate that particular Block is listed

on the display as well as referenced in an expanded format

on the label below the display. If two targets are listed the

fi rst to be listed is the most common and the second listed

slightly less common than the fi rst.

and held or pushed forward to lock, the display indicates the

depth of coin-sized metals. Starting at 12 inches and indicating

in descending order (as the target gets closer to the

bottom of the search coil), the DEPTH = 12 (twelve inches

deep) provides not only an aid in better locating the target in

the ground (how deep you will need to dig) but also clues as

to if the metal target is likely worth digging. For example if

the display is unsure (quarter block indication), is indicating

in the FOIL range, and the depth reads deep 6 to 12 inches,

you should dig the target. Only the heavier more valued

targets get deeper into undisturbed ground. If the display

reads unsure (quarter block), indicates in the FOIL area,

and the depth reads shallow 0 to 2 inches, the target is most

likely not worth digging. Foil will not sink deeply into undisturbed

ground. Targets that indicate depth readings from 3

- 5 inches are not as predictable. The shallower Depth readings

typically have fuller Blocks to warrant digging. A large

target that is very deep will tend to provide a small pinpoint

area as well as an inaccurate shallow depth indication. Use

this to your advantage; a shallow depth indication (0-1 inch),

having dug six inches and not found the target, is a larger

deeper target.

Chapter 4 MXT Pro Display

Half block indicating detector is not

16

sixteen fi lled in Blocks as Coin and Jewelry mode to further

confi rm, on the reference label, the connection between the

VDI number and software’s best determination of the target

identity. The vertical size (one quarter, one half, or the whole

block) tells one how sure the MXT Pro is of the target ID.

Full bar and half bar usually means dig. Quarter blocks are

uncertain.

Chapter 4 MXT Pro Display

held or pushed forward to lock, the PP blocks aid in pinpointing

the exact center of the metal target. Only when

the search coil is directly over the center of the metal target

(longest possible length PP Blocks) is the depth reading

giving you the most accurate depth indication in inches.

Also of importance is that with some experience the relative

size and shape of the metal target can be recognized during

pinpointing. Small pinpoint = small target. Relatively larger

pinpoint = larger target. Elongated pinpoint = elongated target.

The exception is that a large target that is very deep will

tend to provide a small pinpoint area as well as an inaccurately

shallow depth indication. Use this to your advantage;

a shallow depth indication (0-1 inch), having dug six inches

and not found the target, is a larger deeper target.

The Relic MODE also provides 5 different signifi cant indications

on the display.

relic VDI (Visual Discrimination Indication) is a reference

number dictated mostly by the metal targets exact alloy,

size, and shape. And just like coins and jewelry, relics can

indicate with similar VDI numbers for different objects because

their makeup and electrical characteristics are similar.

Using the reference label below the display one can see that

iron relics are still in the low VDI numbers and objects like

brass buttons and buckles with a high concentration of nonferrous

metal or alloy rate higher VDI numbers compared to

their size and purity.

top display is

a sure ID. The

bottom display

with its quarter

size bar suggests

uncertain

unless the

Depth reading

is 6-12.

Mode toggle

switch Center

for Relics

17

Chapter 4 MXT Pro Display

in the upper right of the display. The text labels are Hot

Rock, IRON, BUTTON, BULLET and BUCKLE. Obviously

there are many more relic items possible. Just keep your

imagination open for what possible objects were produced in

metal and how they might compare in size and alloy to the

ones mentioned above.

and held, the display indicates the depth of coin-sized metals.

Just as in the Coin and Jewelry mode, Depth not only

tells you how deep the target is but combined with the block

reading and target label on the right side of the display it

can indicate if the item is worth digging. A 6-12 Depth and

any size Block indication means dig. Shallower targets and

a quarter or half size block suggests trash. This is because

the older, heavier, more desirable targets, settle deeper into

undisturbed ground. The shallower Depth readings typically

have fuller Blocks to warrant digging. Again Small pinpoint

= small target. Relatively larger pinpoint = larger target.

Elongated pinpoint = elongated target. The exception is that

a large target that is very deep will tend to provide a small

pinpoint area as well as an inaccurate shallow depth indication.

Use this to your advantage; a shallow depth indication

(0-1 inch), having dug six inches and not found the target, is

a larger deeper target.

the trigger, the

quarter Block reading

is questionable.

A depth reading can

help you decide to dig

or not.

A depth of 5

suggests you

should dig.

technique to “pinpoint” the exact center of the target.

18

Chapter 4 MXT Pro Display

The Prospecting MODE changes the audio and display

information more dramatically compared to switching from

Coin & Jewelry to Relic.

Gold in its natural state can be any size and shape from

very tiny pinhead size fl akes to large placer gold nuggets as

well as veins of various sizes in quartz rocks. The Prospecting

MODE takes these facts into consideration and changes

the display accordingly.

When prospecting, an operator must expect to dig nonferrous

(not of iron) trash metals such as aluminum, lead, and

small brass. Any of these metals can and do illicit the same

response as gold and MUST BE DUG. Attempts should be

made to avoid only IRON targets and only when possible.

The MXT Pro displays information, which is intended to help

the user determine whether the target is NON-IRON (dig) or

IRON (don’t dig). In heavy mineralized ground tiny pieces of

gold can sometimes look like IRON to a metal detector and

small pieces of IRON can look like gold. The VDI numbers

and Iron Probability scale both provide help in determining

when to dig.

The Prospecting MODE provides four signifi cant display

indications.

on the label below the display. Gold can indicate anywhere

from slightly negative to +80 on the scale, however,

most small nuggets indicate in the -20 to +40 range. Metals

that indicate above +80, or below -20 are highly unlikely to

be gold unless they are conglomerated with highly unusual

alloys. If the VDI number tends to jump back and forth from

small negative numbers to small positive numbers it is usually

a small piece of some metal and should be investigated

by digging.

Remember, small fl akes of gold in bad ground can read into

the small negative range. A magnet on your digging pick can

sort out a small shard of iron quickly.

is ferrous (iron) expressed in a %. This indication can be

different in different areas depending upon the degree of

mineralization. As a general rule targets registering 60%,

70%, 80%, and 90% are going to be iron. 80% and over will

produce the audio grunt using the standard turn-on & go settings.

Targets that register 10%, 20%, 30% or 40% are going

to be gold or (lead, copper, aluminum, brass). All targets registering

50% or below should be investigated. As mentioned

under the VDI section, iron ground mineralization can distort

the way the detector reacts to gold. It is always a good idea

to place a penny-weight test nugget just under the surface

of the ground where ever you are going to be prospecting

and note how it reacts to the IRON TARGET %. If a small

test nugget is not available, a USA nickel or lead bullet will

respond identically to most similar sized gold nuggets. This

will give you a gauge as to what to expect. Ground minerals

and the size of the target affect the degree of dependability.

It is not uncommon for a small piece of gold in very bad

ground to read 70% probability of being iron. Remember

when in doubt… DIG. Use both the VDI and % IRON PROBABILITY.

Dig often at fi rst, till you get a feel for the area and

accuracy in that ground. When searching a new area, retest

the sample target and % Iron Probability accuracy.

with a proper VDI number for gold and a low % iron target

Mode toggle

switch Down for

Prospecting

19

Ground phase indications are a doubled edged sword.

Higher numbers simply mean predominately ferrous (iron)

such as black sands / magnetite. Lower numbers simply

mean less iron and/or predominately conductive nonferrous

(not of iron) content, such as gold per ton of rock. So

in a dry wash, outcropping, or vein, a shift in either direction

(higher or lower numbers) may be of interest. For example a

black sand streak may have a lot of fl our gold at one end. It

will indicate a high ground phase number on the end without

the fl our gold, and a lower ground phase on the end with the

fl our gold. The same applies to veins or an outcropping. It

is the change that brings about the interest more so than if

it is either high iron (high number) or high conductive (lower

numbers).

Knowing that the ground is high iron (magnetite), outlining

black sand pockets (the likely area gold will be found),

checking veins for consistency (change), and comparing

rock samples for possible assay, are the common uses of

ground phase. Again, change is of the most interesting,

more so than the direction of the change.

Chapter 4 MXT Pro Display

ground. This is useful in two different environments.

Bearing Ground in a Dry Wash. Within a dry wash the

gold will settle with the heavier materials (black sands).

When searching you notice the ground phase is declining

(lowering in number), generally you are working

further away from the heavy black sand deposits. If

you notice the ground phase is increasing, generally

you are working toward (closer) to the heavier deposits.

By following the more intense ground phase (higher

numbers) you increase your likelihood of fi nding nuggets

within the heavier material (black sands).

can also be useful in a similar way by indicating the

consistency or change of the veins ground phase.

Generally speaking, the ground numbers will hold fairly

consistent in most open terrain areas, such as hydraulic

sites and desert areas. GND readings in the high

70’s and 80’s are considered heavy iron mineralization.

Alkali or salt areas will display much lower numbers,

possibly into the 30’s and 40’s.

number indicating high mineralization or black sand. When that streak is identifi ed you will then look for the Ground Number

to lower again at one end of the streak indicating where the fl our gold or gold ore may be concentrated.

Alkali or salt area in a dry wash

Black sand streak-heavy iron mineralization Flour gold

concentration at

one end of black

sand streak

GND = 30

GND = 83

GND = 45

20

Chapter 5 MXT Pro Controls

Selects the operating MODE or type of searching desired

on that particular outing. Major audio and display changes

occur with the selection between the three available operating

MODES. For example the audio and function / information

on the display changes between the three MODES, the

function and available features of the TRIGGER switch on

the hand grip changes between the three MODES, and the

DUAL CONTROL function changes between the MODES.

For quick fi eld reference, the silk screen painted on the bottom

of the control box is provided to simplify these changes

and features.

Further explanation is provided as follows;

MODE

21

Chapter 5 MXT Pro Controls

DUAL CONTROL

DISC- DISCRIMINATION (outer ring)

When in COIN & JEWELRY and RELIC MODE

VARIABLE SELF ADJUSTING THRESHOLD SPEED (SAT)

When in Prospecting MODE.

22

Chapter 5 MXT Pro Controls

23

Chapter 5 MXT Pro Controls

on, Iron Grunt provides a distinctive grunt for all

targets certain to be iron (80% and higher probability).

If turned off by pressing “music notes”

Tone ID the same VCO audio tone will be heard

for all targets.

The TRAC toggle selects the type of ground mineral rejection

(ground balance) and automatic tracking to ground

mineral changes best suited to the specifi c area. Three different

positions for a specifi c ground condition (ground type)

are provided.

conditions. In this position the MXT Pro will quickly compensate

for ground minerals in a few pumps of the search

coil over the ground being searched and automatically track

to any ground changes as you sweep the search coil during

searching. For most operators the Ground position will be

used for over 90% of your searching conditions.

changing ground conditions. Man made iron decomposes to

the point of tricking the Ground and Salt position tracking

into thinking it is a mineralized part of the ground. This

can create noise and instability during searching as the

tracking system bounces radically up and down the scale,

always searching for a good ground rejection setting and

never able to fi nd it. This makes it diffi cult for an operator

to recognize worthwhile targets and/or run at the higher

performance GAIN settings. In these conditions it is recommended

to fi rst go to the Ground or Salt position and pump

the search coil over a clean area of ground representative

of the area (free of man made iron) then switch the TRAC

control to Lock. By doing so stability and success searching

these trashy areas will improve dramatically. Because

ground changes are monitored during Lock, pressing and

releasing the GROUND GRAB button, or switching back

to either Ground or Salt tracking positions, updates to the

appropriate ground setting (ongoing tracking) are virtually

instantaneous.

Another example of when Lock would be used is if a

particular mineralized rock or patch creates diffi culties in

searching an area. A hard rock mine for example with a low

mineralized quartz based rock and random high-mineralized

magnetite rocks or patches. Place the TRAC control

in the Ground position and balance “pump the search coil”

over a representative sample of the high mineral rock or

patches. Then Lock in that ground rejection setting “place

the TRAC control in the Lock position”. The entire area can

then be searched without the distraction of the inconsistencies

the high mineral patches create.

and tracking range to compensate for conductive salts also

called alkali. Ground rejection against salt/alkali slightly

overlaps the lower end of the conductive target (metal)

range. In other words if you ground balanced against signifi -

cant salts, some loss of sensitivity to lower conducting

metals (metals low on the VDI target scale) can be expected.

The advantage and performance improvements of

rejecting the salt, however, far outweigh any loss. Because

the Salt TRAC setting can track well into the target range it

is not recommended for normal conditions, only for areas

known to contain salt.

24

Salt water beaches for example or alkali desert regions.

The Ground setting will not track into the nonferrous metal

region. The Salt setting will. The MXT Pro ground rejection

system is capable, in both the Ground

and the Salt settings, of considering some iron a ground

mineral. If operating in a known salt area, salt water

beaches for example, it is not necessary to balance in the

Ground TRAC setting. Simply select the Salt TRAC setting

and proceed to pump the search coil over the ground to

be searched. The Salt setting will balance and then track

to changes identically to the Ground setting only with an

extended range, well into the conductive target area.

recommended for most searching conditions.

established in the Ground or Salt TRAC positions. Lock is

recommended for areas that cause detector instability due to

spotty extreme ground peculiarities such as a lot of decomposing

man made iron or random but regular high mineral

pockets or rocks in a low mineral base.

for conductive salt/alkali conditions. The Salt setting

can ground cancel extreme enough to reduce sensitivity to

low conducting metals, metals that appear low on the VDI

scale. The Ground TRAC setting will not balance nor track

into the nonferrous metal region. Despite this draw back the

Salt setting still provides improved overall performance while

operating in the salt/alkali ground condition.

Chapter 5 MXT Pro Controls

With the GAIN control, you turn the instrument On/Off and

select the signal strength. You might expect increased signal

strength to always fi nd more at greater depths. However,

high ground mineralization will mask good targets. It is

therefore necessary to adjust GAIN to give you the maximum

allowable signal strength without masking targets or

overloading the circuit and at the same time allowing you to

operate the detector with a constant faint threshold hum so

that faint signals (deep or small targets) can be detected.

The MXT Pro will indicate when ground mineralization is too

high for the current GAIN control setting. When the display

with an audible “squawk” reduce the GAIN till the overload

warning ceases.

On occasion, while searching, you might sweep the search

coil over a very large or very shallow target. The message

a little higher over the area and note the display and audio

indications to check for a real metal target. The MXT Pro self

corrects after the message and you can continue to search

as normal.

Again, OVERLOAD over a large area indicates Gain is too

high for the ground minerals. Overload over an isolated area

GAIN Control

25

self-adjusting threshold) control will help to maintain a reasonably

smooth THRESHOLD “hum” particularly at higher

GAIN settings and will be covered in a later section.

on the display, if a relatively smooth background THRESHOLD

“hum” doesn’t continue, or if ground noises are a

problem reduce GAIN.

more accurately when the GAIN is set at a level that allows

for reasonably smooth operation. Too much GAIN can cause

bad ground to distort the proper identifi cation of iron and

non-iron targets.

coming from the audio (speaker) during GAIN adjustments

as the circuit shifts between hardware and software gains

(different electrical parts of the circuitry). The GAIN control

adjusts both the hardware gain (hard physical component)

as well as the software gain (computer code) alternating

between the two throughout its range. As the MXT Pro shifts

between these two intricate parts of the circuitry an audio

indication notes the transitions. This can be helpful. If you

adjust the Gain slightly, the audio notes signifi cant rather

than slight change with these audio shifts.

typically useful assuring performance. Few areas will allow

maximum GAIN (full clockwise) without at least some degree

of noisy operation. Setting in the + area requires a high

degree of operator skill.

Chapter 5 MXT Pro Controls

indicates a very large target, sweep loop higher over area to

confi rm if the target may be of interest.

target message.

and controls the GAIN. Starting from the POWER OFF

position and going clockwise, the power is turned ON and

the dial increases the GAIN from a minimum level of “1” to a

maximum level of “+3”. Set the control to the “Initial Setting

Triangle” (between level 9 & 10).

GAIN, if the ground mineralization is low enough, you might

attempt to raise the GAIN above this level toward +3.

available depth from the detector WITHOUT causing diffi

culties in recognizing real metal targets, and without the

(when the search coil is over ground, IS NOT over

a metal target) indicating a ground mineral overload of the

circuit.

BE at the expense of maintaining a reasonably smooth and

constant THRESHOLD “hum”. False signals, beeps and static

from bits of mineralization, erratic behavior, and prolonged

lapses in THRESHOLD, all can be the result of running with

too much GAIN.

26

Chapter 5 MXT Pro Controls

MODES the Dual control operates as a DISC (discrimination)

control. DISC (Discrimination) is used to adjust the level

of audio rejection against trash metals.

The “Triangle” just below NICKEL is recommended for most

general purpose searching. In this position, the detector

will provide a reject response to most iron and light foil and

respond to most valuables including jewelry.

Positions lower than “triangle” (counterclockwise) will provide

less trash metal rejection, to the point of detecting virtually

all types of common metals.

Positions higher than the “triangle” (clockwise) will reject

more trash metals including aluminum pull-tabs. The display

will continue to indicate I.D. even though the audio discriminator

will signal with a reject (suppressed or broken) sound.

Nickels and some jewelry will also be rejected with DISC

settings much greater than the “triangle”.

The “triangle” position is recommended for most MODES.

If when searching at the “triangle” position you feel you are

digging too much trash, adjust DISC slightly clockwise and

try again. Using the lowest (furthest counterclockwise) position

that is practical considering the common trash metals

in your area is important in order to fi nd items of jewelry.

Settings that suppress the USA nickel, and/or a medium 14K

gold ring, will also suppress most other gold jewelry. For

jewelry, it is best to keep the Discrimination at or near the

“triangle” and rely on the display and depth indication to sort

out aluminum.

When in the Prospecting MODE, the DUAL CONTROL is

used to adjust the level or speed of SAT (Self Adjusting

Threshold).

The Threshold or continuous faint hum heard during operation

of the MXT Pro can increase or fade due to environmen-

DUAL CONTROL

DISC- DISCRIMINATION (outer ring)

When in COIN & JEWELRY and RELIC MODE

VARIABLE SELF ADJUSTING THRESHOLD SPEED (SAT)

When in Prospecting MODE

27

Chapter 5 MXT Pro Controls

tal interference or from inconsistencies in ground mineralization.

This can be heard as chatter when excessive. Faster

SAT speeds tend to calm this interference allowing target

sounds to be separated and identifi ed compared to non-target

or ground noise.

The MXT Pro is computerized, which allows improved SAT in

ways not practical in the past. These improvements “kick in”

progressively at higher settings allowing better ground silencing

in highly variable ground. At these higher settings, cold

rocks (rocks well below the current ground mineral rejection

level) will sound “different” giving a “double blip” sound or

vanishing entirely, rather than giving the “boing” sound you

will get at lower settings. A major difference between a gold

nugget and a cold rock response is that when you sweep

back and forth, the gold nugget will “stay in one spot” but the

cold rock will seem to keep wandering around. This can also

be the case with a pocket of negative mineralization.

The TRAC feature compensates for common ground minerals

in the area. The SAT control compensates for the inconsistency

of the ground mineralization. The greater the degree

of inconsistencies, the more SAT is needed to quiet ground

noise. If the THRESHOLD becomes too erratic or noisy, it

might be necessary to use the SAT feature and/or reduce

the GAIN control. This noisy behavior will make it diffi cult

to recognize a true target (possible nugget) from pieces of

mineral, commonly referred to as “hot rocks”. It is not wise

to keep a high level of GAIN if the detector will not operate

smoothly. This is a false sense of security. Maintain as

smooth a threshold as you can. Recognizing a true target

is the most important part of detecting. This is an example

of when less GAIN will produce more nuggets. You must be

the best judge of just how much noise you can tolerate and

still identify nuggets, and thus the amount of SAT and GAIN

to use to produce the desired results in your area. If you

have been operating your MXT Pro at the full level of GAIN

(+3) and you determine that this is too high because either

the threshold is erratic or the detector is giving false signals;

always begin by reducing the GAIN toward the Initial

Setting triangle. If this does not correct the problem, start

adding some SAT speed by turning the SAT control slowly

clockwise. If this does not correct the problem, go back to

the GAIN and reduce it a little more and add a bit of SAT. It

is sort of like seasoning a pot of soup. Some salt and some

pepper. Remember any drop in GAIN below (7-8) will result

in some loss of depth. Any increase in SAT speed above the

“P” setting may also affect overall depth.

However, before reducing the Gain below 7 - 8 you might

try to experiment a bit with the HYPERSAT range of the

SAT control. This function is unique to White’s SAT. The

Threshold will almost buzz and loss of depth will be minimal.

Reserve this option for situations where ground is unusual

or conditions extreme.

If the Threshold cannot be stabilized with small reductions

in Gain and small increasing SAT, then “jump start” SAT into

the HYPERSAT range. Before attempting this, you might

practice sweeping over a test nugget to learn to identify it’s

sound with HYPERSAT. We like to use the analogy of driving

on a straight road versus a curvy road. The object is to

get from point A to point B. 65 mph might get you there on a

straight road, but you will have to slow to 35 mph if the road

is curvy, or you will end up off the road. The straight road is

like low mineralized ground and the curvy road is like heavy

mineralization. High Gain and slower SAT will not recover as

much Gold in heavy mineralization as lower GAIN and faster

SAT.

GAIN Control

SAT SPEED CONTROL

(Prospecting Mode Only)

28

Chapter 5 MXT Pro Controls

The THRESHOLD control sets the loudness of the background

“hum” or edge of sound. This background “hum”

should normally be maintained during searching. In order

to hear the tiniest and deepest targets the THRESHOLD

“hum” should be set at the faintest audible level. It can be

slightly scratchy, chatter or static like but it must be constant

so as to not miss that small or deep targets. At this point, we

can’t recommend too highly the advantage of using HEADPHONES.

With HEADPHONES you can lower THRESHOLD

“hum” levels, and hear the faintest of target signals while

canceling out environmental background noise and improving

concentration.

The MXT Pro has an improved microprocessor driven

THRESHOLD control that is adjusted with a single turn. It

does not, therefore, require a 10-turn pot for precise adjustment.

Digital software provides much higher resolution, thus

you can set the “hum” faster and more accurately. Set the

knob all the way to the left or counterclockwise and then

rotate it clockwise until the faintest audible level of “hum” is

attained (edge of sound). If the “hum” disappears for any

reason (other than bumping the control) you may be either

swinging the coil too fast or your GAIN control is set too high,

or in the prospecting MODE you may need to increase the

speed of SAT.

With microprocessor driven THRESHOLD controls arguably

skillful operators can “cheat the system” and use silent

search with high performance results. Once the threshold is

found, edge of sound, setting the Threshold control slightly

counterclockwise achieves silent search where no threshold

hum is heard during searching. By further optimizing Gain

to radical levels, much of the resulting noise can be hidden

under the Threshold and thus produce good fi eld results.

Best reserved for more experienced operators, a balancing

act between higher Gain V.S. the stronger response required

to surpass the threshold setting, must be achieved and

understood.

THRESHOLD CONTROL

“HUM”

29

Due to the wide scan nature of modern search coils it can

be diffi cult to locate small targets under the physical center

of the loop. Use an “X” marks the spot technique as shown

in the diagram to identify the portion of ground the metal

target is in. Prospecting for small nuggets, because small

metal targets are more diffi cult to isolate to an exact location

compared to coin or relic hunting, may require removing the

soil under the center of the “X” until the target is no longer in

the hole, but in your pile of dirt.

Again, the procedure is to sweep over the target from sideto-

side noting the side-to-side center. Then turn 90 degrees

and sweep the coil side-to-side noting the center from this

new direction. “X” marks the spot that you need to dig. You

can practice with a coin or small pieces of lead or gold on

top of the ground to become acquainted with the technique.

During Prospecting it is a good idea to have a magnet

handy, preferably in the handle of your digging pick, to pull

iron out of the dirt pile. It will speed up your recovery time. It

will work on small almost invisible iron rocks as well.

Accessory “DD” search coils (recommended for extreme

ground mineral areas and/or prospecting with the MXT Pro)

pinpoint signifi cantly different than the standard equipment

traditional concentric search coil. Standard equipment

concentric search coils tend to center to a round spot close

to their physical center. “DD” search coils will center along

a line running front to back. Using a “DD” accessory search

coil the most isolated pinpoint is achieved side-to-side. By

using this side-to-side pinpoint on one plane, say east to

west, then, turning and again using this side-to-side north to

south, pinpointing with a “DD” search coil can be as accurate

as a concentric. With a “DD” accessory search coil pinpointing

in more of a “+” is far better than “x”. Center side-toside,

then turn 90 degrees and center side-to-side.

Chapter 6 MXT Pro Pinpoint Technique

movement and repeat for “+”ing the center.

30

The headphone jack on the MXT Pro is located on the

control box above the battery compartment. There is a dust

cover on the headphone jack that needs to be removed

before the stereo plug from the headphone is inserted. Replace

this cover when headphones are not being used. Most

users prefer high quality stereo headphones so White’s has

chosen to wire the headphone jack for stereo. If you have a

mono headphone, you can purchase an adapter that will allow

sound in both ear pieces. Some headphones come with

a switch for stereo or mono jacks.

In choosing headphones, make sure they have a VOLUME

CONTROL, as there is no target volume control on the MXT

Pro. This is an important comfort issue. Remember that you

want the faintest THRESHOLD “hum” possible but a strong

comfortable target signal. With headphones you will be able

to work with a lower THRESHOLD “hum”, hear fainter target

signals, avoid bothering others with a “beeping” box, and

save on battery life. Many high quality headphones from

full ear enclosure to lightweight summer models that offer a

bit more safety in snake and bear country are available on

the market. Higher impedance headphones (60 Ohms or

greater) give the most sensitivity and are better for hearing

the tiny targets most likely to be heard while prospecting.

Properly balanced impedance is important as well as low

distortion.

Chapter 6 MXT Pro Searching

31

Chapter 6 MXT Pro Searching

ground ceases to respond.

repeatable beep produced by a good metal target. It is

wise to plant metals just under the soil to practice on in order

to learn to recognize what it will sound like. Planting a metal

target disturbs the ground mineral, which usually reduces

the depth it would have been found in undisturbed ground. It

will take practice to determine the proper search speed and

technique. Do not go too fast, about 2 seconds from right-toleft

and two seconds returning from left-to-right. Overlap your

sweep path 50% so that you won’t miss the small and/or

deeper metal targets.

display information. If the target indicates in the mid scale

aluminum Pull Tab range, squeeze and hold the Trigger on

the handgrip “+” the search coil over the area and check the

depth. If it is shallow (0 - 2 inches) depending on the hardness

of the ground, it is most likely a Pull Tab and should be

ignored. If it is deeper (beyond 2 inches) depending upon

the hardness of the ground, it is likely heavier gold jewelry

and should be dug.

aluminum scraps or Pull Tabs it may be necessary to search

full time with the Discrimination control set high enough to

reject their audio response and save your time and efforts

for digging coins and jewelry that indicate outside the pull

tab range. However, note; when aluminum is rejected the

probability of digging jewelry substantially diminishes. The

highest (furthest clockwise) discrimination setting than still

responds to the USA nickel, or a medium sized 14K gold

ring, is the highest trash rejection level that still responds to

most jewelry.

above only with the TRAC toggle in the Salt position.

made iron (which may make the MXT Pro appear unstable

only during search coil sweeps), proceed exactly

as above only once you pump the loop over the ground,

then set the TRAC control to Lock.

The Coin & Jewelry MODE provides good general

purpose searching for a wide variety of targets and

environments. From residential yards, parks and school

grounds, farm fi elds, to beaches (for beaches use TRAC

Salt), the Coin & Jewelry MODE should be used if there

is any doubt at all regarding which of the three available

MODES is most practical for your current search.

As the name implies, Coins & Jewelry are the primary

goals of this mode, however, these settings and features

will also respond to any better alloy including common

relics and any other item made of a valued metal alloy.

The 1st option a user should consider is the selection of

an appropriate TRAC toggle setting for the area. The

Ground setting and Salt settings should be almost selfexplanatory.

If you are searching in typical ground, use

the TRAC Ground setting. If you are in a salt water or

desert alkali ground condition, use the TRAC Salt setting.

When to use the Lock setting can be less obvious.

If it seems like something is wrong with the detector,

wildly fl uctuating Threshold hum (only while sweeping

the search coil), try the Lock setting. If the detector

smooths out and starts operating more predictably, you

made the correct choice. If there isn’t any change, you

may need to reduce the Gain control counterclockwise

32

and/or increase the Dual control (Disc) clockwise and try

again. An area littered with man-made iron would dictate

the Lock setting. On the other hand an area littered

with small aluminum foil would not, such an area would

dictate the Reduced Gain and/or higher discrimination

settings.

The 2nd option is Gain. Some areas require, and some

operators just prefer the more predictable operation

reduced Gain settings provide, where as others prefer to

push Gain to the limits of their patience to fi nd the deepest

targets. There is a point of diminishing returns either

indicated by the display telling you OVERLOAD to lift

the loop due to a Gain setting too high for the ground, or

a user missing targets because they can not sort them

from sporadic noise experienced at high Gain.

The 3rd option is the level of audio Discrimination

(DUAL CONTROL). The “Triangle” provides a popular

setting rejecting most iron and small foil and accepting

USA nickels and most jewelry. Remember you have the

display to further sort out accepted metals. However, if

the common trash of the area consistently produces an

audio to the point of distracting from fi nding anything at

all, an operator can increase discrimination (clockwise)

and cherry pick the area for silver and copper. If a hot

spot of multiple coins is located an operator may then

want to search isolated spots within that area at lower

discrimination settings. Even with modern discriminating

metal detectors, it takes a good deal of patience to

search high trash areas. Remember a metal target that

indicates in the Pull Tab range however, provides a deep

depth indication, is more likely to be jewelry than a Pull

Tab. There are six types of targets that typically indicate

in the Pull Tab range, USA Nickels, Aluminum, Lead,

Brass, Small Bronze, and Gold. Without consistency

in size/shape, all a metal detector can tell you is that it

indicates within that mid-range of targets. It is up to the

operator to identify the common trash items of each area

and then gamble with the odds weighing the likelihood

of good targets compared to the degree of time digging

trash.

The 4th option is Threshold level. It is best to search

with a continuous hum or threshold (edge of sound).

You can hear rejected targets (threshold fades) and be

made aware when and where concentrations of trash

items lay, indicating traffi c areas more likely to produce

good targets. It, however, requires more patience and

concentration. Finding the Threshold, and then setting

the Threshold just counterclockwise of it (Silent Search),

provides good performance for those who cannot tolerate

the continuous Threshold hum all the time.

The 5th option is to turn off the TONE ID. Coin & Jewelry

starts out with TONE ID ON. Accepted targets, based

on the Discrimination control setting, produce higher

pitch tones the higher they measure on the Display VDI

number scale. Seven tones represent the entire VDI

scale. However, if one pitch tone is desired for all accept

targets, Turn Tone ID OFF.

until ground ceases to respond.

distinct repeatable beep (high or low tone) produced by a

metal targets. High pitch tones are targets above the Discrimination

setting. Low pitch tones are targets below the

discrimination setting. It is wise to plant metals just under

the soil to practice on in order to learn to recognize what it

will sound like. Planting a metal target disturbs the ground

mineral, which usually reduces the depth it would have

been found in undisturbed ground. It will take practice to determine

the proper search speed and technique. Do not go

Chapter 6 MXT Pro Searching

33

too fast, about 2 seconds per pass from right-to-left and two

seconds returning from left-to-right. Overlap your sweep

path 50% so that you won’t miss the small and/or deeper

metal targets. Targets to deep or small to achieve good

tone identifi cation will sound at the threshold level tone.

display information. Squeeze and hold the Trigger on the

handgrip and “+” the search coil over the area to pinpoint

and note how deep you will need to dig listed on the display.

above only with the TRAC toggle in the Salt position.

made iron (which may make the MXT Pro diffi cult to operate),

proceed exactly as above only once you pump

the loop over the ground in the Ground TRAC setting,

then set the TRAC control to Lock.

The Relic MODE also provides good general purpose

searching for a wide variety of targets and environments

although it will require greater patience to use

in populated areas compared to Coin & Jewelry as the

Relic MODE is designed to locate a wider variety of

metal alloys (lead and brass). As the name and target

labels imply, the Relic MODE is designed with encampments

and abandoned homesteads in mind as the

primary goals, however, these settings and features

will also respond to any better alloy including common

coins and any other item made of a valued metal alloy.

In the primary Trigger (on the hand grip) center position,

any target accepted by the discrimination setting

produces a higher pitch beep and any metal target

rejected by the discrimination setting produces a lower

pitched beep. Uncertain targets may respond in-between

with the Threshold pitch.

The 1st option a user should consider is the selection

of an appropriate TRAC toggle setting for the area.

The Ground setting and Salt settings should be almost

self-explanatory. If you are searching in typical ground,

use the TRAC Ground setting. If you are in a salt water

or desert alkali ground condition, use the TRAC Salt

setting. Highly fertilized farm fi elds (iron & ammonium

nitrate/oxides) when wet may also benefi t from the

SALT setting. When to use the Lock setting can be

less obvious. If it seems like something is wrong with

the detector, wildly fl uctuating Threshold hum (only

during sweeping the search coil), try the Lock setting.

If the detector smooths out and starts operating more

predictably, you made the correct choice. If there isn’t

any change, you may need to return to the Ground or

Salt setting and either reduce the Gain control counterclockwise

and/or switch to the 1 TONE and increase

the Dual control (Discrimination) clockwise and try

again. 1 Tone suppresses the audio of rejected targets.

Standard Relic mode 2 Tone produces a low pitch tone

for rejected targets. An area littered with man-made iron

would dictate the Lock setting. On the other hand an

area littered with small aluminum foil would not, such an

area would dictate Reduced Gain and/or 1 TONE with

higher Disc settings.

The 2nd option is Gain. Some areas require, and some

operators just prefer, the more predictable operation

reduced Gain settings provide, where as others prefer

to push Gain to the limits of their patience to fi nd the

deepest targets. There is a point of diminishing returns

either indicated by the display OVERLOAD telling you

to lift the loop due to a Gain setting too high for the

ground, or a user missing targets because they can

not sort them from sporadic noise experienced at high

Gain.

The 3rd option is the 1 TONE mode. In 1 TONE, the

audio of targets rejected by the Discrimination control

setting is suppressed. This feature provides traditional

discrimination for the RELIC mode producing fewer

noises suppressing any metal target signal below the

discrimination setting. This feature is best for those who

have no interest in iron type targets.

The 4th option is IRON ID TONE. In IRON ID, the

discriminate control is disabled (doesn’t have any infl uence).

Iron targets sound with the lower pitch tone. All

non-iron produces a higher pitch tone. If you are interested

in both Iron and non-iron targets, Iron ID might be

Chapter 6 MXT Pro Searching

34

preferred over 2 Tone.

The 5th option is Threshold level. It is best to search

with a continuous hum or threshold (edge of sound). In

many modes you can hear rejected targets (threshold

fades) and be made aware when and where concentrations

of trash items lay, indicating traffi c areas

more likely to produce good targets. It, however, also

requires more patience and concentration. Finding the

Threshold, and then setting the Threshold just counterclockwise

of it, provides good performance for those

who cannot tolerate the continuous Threshold hum.

position.

until ground ceases to respond.

the distinct repeatable beep produced by a metal

target. The Prospecting Mode utilizes a VCO (Voltage

Controlled Oscillator) audio, thus the pitch of the

beep varies with the strength of the target. It is wise to

plant metals just under the soil to practice on in order

to learn to recognize what it will sound like. Planting a

metal target disturbs the ground mineral, which usually

reduces the depth it would have been found in undisturbed

ground. It will take practice to determine the

proper search speed and technique. Do not go too fast,

two seconds from right-to-left and two seconds returning

from left-to-right. Overlap your sweep path so that

you won’t miss the small and/or deeper metal targets.

consult the display VDI number and % ? Iron. Squeeze

and hold the Trigger on the handgrip and “+” the

search coil over the area to pinpoint.

as above only with the TRAC toggle in the Salt

position.

man made iron (which may make the MXT Pro

diffi cult to operate), proceed exactly as above only

once you pump the loop over the ground in the

Ground TRAC setting, then set the TRAC control

to Lock.

to increase the Dual Control SAT adjustment

clockwise. Hyper SAT provides threshold maintenance

for the most extreme conditions. Search

coil motion becomes increasing more critical at

these higher SAT speeds.

The Prospecting MODE will require greater patience

to use compared to the Coin & Jewelry and

Relic MODES. It is designed to locate all varieties

of metal alloys and then give some indications as

to if the metal being detected is made of ferrous

(iron) or nonferrous (not iron).

As the name and target labels imply, the Prospecting

MODE is designed to fi nd gold nuggets, however,

these settings and features will also respond

to all metal alloys including common coins. Any

target likely to be iron (ferrous) produces an audio

grunt and any metal target not readily identifi ed

as iron (nonferrous) produces a traditional VCO

pitched beep (zip sound).

Upon repeated search coil sweeps, small or

weak targets can be obscured by ground tracking

Chapter 6 MXT Pro Searching

35

adjustments. If you are unsure if a response is a

real target, and/or wish to sweep over any target

repeatedly, if is best to do so either holding in the

Trigger on the handgrip, or holding the GROUND

GRAB button. Squeezing and holding the trigger

on the grip or squeezing and holding the GROUND

GRAB button, temporarily disables tracking.

The 1st option a user should consider is the selection

of an appropriate TRAC toggle setting for the

area. The Ground setting and Salt settings should

be almost self-explanatory. If you are searching in

typical ground, use the TRAC Ground setting.

If you are in a salt water or desert alkali ground

condition, use the TRAC Salt setting. When to use

the Lock setting can be less obvious. If it seems

like something is wrong with the detector, wildly

fl uctuating Threshold hum (only during search coil

passes), try the Lock setting. Before switching to

the Lock setting, be sure to pump the search coil up

and down over the ground a few times in the TRAC

Ground or Salt setting to insure that you have

achieved proper ground balance for that area. If

the detector smooths out and starts operating more

predictably in Lock, you made the correct choice.

If there isn’t any change, you may need to return

to the Ground or Salt setting and either reduce the

Gain control counterclockwise and/or increase the

Dual control (SAT) clockwise and try again. An

area littered with man-made iron would dictate the

Lock setting. On the other hand an area with very

inconsistent ground would not, such an area would

dictate Reduced Gain and/or higher SAT settings.

The 2nd option is Gain. Some areas require, and

some operators just prefer, the more predictable

operation normal “P” or reduced Gain settings

provide. Others prefer to push Gain to the limits of

their patience to fi nd the deepest targets. There is a

point of diminishing returns either indicated by the

OVERLOAD display telling you to lift the loop due

to a Gain setting to high for the ground, or a user

missing targets because they can not sort them

from sporadic noise experienced at high Gain.

The 3rd option goes hand in hand with the Gain

setting and the SAT speed or level controlled by

the DUAL CONTROL. Higher (faster) SAT speeds

are more user friendly, however, may compromise

some sensitivity particularly to small nuggets

as well as adding additional search coil sweep

requirements. On the other hand faster SAT will

allow for higher Gain settings and more inconsistent

ground conditions. A balancing act must

be achieved between the Gain control and SAT

speed that provides both good performance and

enough stability to recognize nuggets from ground

or external noise. A new SAT feature “Hyper SAT”,

provides for the most extreme conditions with very

unique characteristics.

The 4th option is Threshold level. It is best to

search with a continuous hum or threshold (edge

of sound). You can hear smaller and/or deeper

nuggets and be made aware when the SAT speed

is doing its job maintaining the Threshold hum. It,

however, also requires more patience and concentration.

Finding the Threshold, and then setting

the Threshold just counterclockwise of it, provides

good performance for those who cannot tolerate

the continuous Threshold hum.

The 5th option is if you prefer the distinctive grunt

on iron, or the same VCO audio tone for all targets.

Pressing “Music Notes” Tone ID, the Iron Grunt

feature can be turned on/off. When on, targets

certain to be iron will produce a unique grunt audio.

When off, all targets sound with the standard VCO

audio.

Chapter 6 MXT Pro Searching

36

Chapter 7 MXT Pro Information

cleaned with fresh water and mild soap. The control

box is not waterproof and must be kept dry. Never lift

a wet coil above the height of the control box as water

can run down the inside of the rod damaging the

electronics. A damp cotton cloth can be used to wipe

off a dirty control box.

car trunk during winter and/or summer extremes.

be protected from heavy rain.

turned OFF.

remove the battery holder from the instrument and

remove the batteries from the holder.

will be protected from abuse. Over the years White’s

has noted a higher percentage of service issues and

physical damage regarding units in storage than

those experiencing regular use.

set it down to dig.

standing up from a dig.

any part of your detector.

period.

37

Chapter 7 MXT Pro Information

White’s reputation has been built on quality products backed by quality service.

Our Factory Authorized Service Centers are factory trained and equipped.

They offer the same quality service as the factory. Service before

and after the sale is the cornerstone of our customer relations.

1011 Pleasant Valley Rd.

Sweet Home, OR 97386

(541) 367 6121

Fax (541) 367 6629

tmarshall@whiteselectronics.com

575 West Harrison

Lombard, IL 60148

(800) 392-3223

(630) 620-0618

(630) 620-1005 FAX

tony@ee-il.com

9437 Main Street

Manassas, Va. 20110

(888) 645-0202

(703) 367-7999

(703) 367-0868 FAX

bob@cwrelics.com

Tony Mills Distributor

76 Broadway, Dunolly Vic 3472

Telephone: (+61) 03 5468 1877

Fax: (+61) 03 5468 1667

info@goldsearchaustralia.com

www.goldsearchaustrali.com

38

Contact your Dealer. There may be a quick,

simple fi x or explanation that will prevent having

to send the detector in for service.

and try the detector in another area to be sure

there isn’t interference.

detector, such as batteries and holders, as these

items can result in symptoms.

your concerns, even if you have talked to the

Service Center by telephone.

Always insure your package.

If within two years (24 months) from the original date of

purchase, your White’s detector fails due to defects in either

material or workmanship, White’s will repair or replace at its

option, all necessary parts without charge for parts or labor.

Simply return the complete detector to the Dealer where you

purchased it, or to your nearest Authorized Service Center.

The unit must be accompanied by a detailed explanation of

the symptoms of the failure. You must provide proof of dateof-

purchase before the unit is serviced.

This is a transferable manufacturer warranty, which covers

the instrument two years from the original purchase date, regardless

of the owner. Items excluded from the warranty are

non-rechargeable batteries, accessories that are not standard

equipment, shipping/handling costs outside the continental

USA, Special Delivery costs (Air Freight, Next Day,

2nd Day, Packaging Services, etc.) and all shipping/handling

Chapter 7 MXT Pro Information

costs inside the continental USA 90 days after purchase.

White’s registers your purchase only if the Sales Registration

Card is fi lled out and returned to the factory address

soon after original purchase for the purpose of recording

this information, and keeping you up-to-date regarding

White’s ongoing research & development. The warranty

does not cover damage caused by accident, misuse,

neglect, alterations, modifi cations, unauthorized service, or

prolonged exposure to corrosive compounds, including salt.

Duration of any implied warranty (e.g., merchantability and

fi tness for a particular purpose) shall not be longer than the

stated warranty. Neither the manufacturer or the retailer

shall be liable for any incidental or consequential damages.

Some states however, do not allow the limitation on the

length of implied warranties, or the exclusion of incidental

or consequential damages. Therefore, the above limitations

may not apply to you.

In addition, the stated warranty gives you specifi c legal rights,

and you may have other rights which vary from state-to-state.

The foregoing is the only warranty provided by White’s as the

manufacturer of your metal detector. Any “extended warranty”

period beyond two years, which may be provided by a Dealer

or other third party on your detector, may be without White’s

authority, involvement and consent, and might not be honored by

White’s.

If for any reason you should sell your MXT Pro prior to the date