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Pro II Automatic VLF Discriminator Operating Manual

NOTE: The following manual was scanned with OCR software. Be aware that there may be a few misspellings or anomalies due to the inaccuracies of the software translation. Images are excluded due to the memory requirements; therefore, there will be references to illustrations that do not exist in this text only document.


Bounty Hunter Pro II Automatic VLF Discriminator


Treasure Hunter's Code of Ethics:

1. Respect the rights and property of others.

2 Observe all laws, whether national. state or local. Aid law enforcement officials whenever possible

3. Never destroy priceless historical or archeological treasures.

4. Leave the land and vegetation as it was. fill all holes.

5. Remove all trash and litter when you leave.

6. All treasure hunters may be judged by the example you set. Always obtain permission before searching on private property. Be extremely careful with your probing, picking up and discarding trash, and ALWAYS COVER YOUR HOLES.


Assembly of this unit is easy and requires no special tools. The only assembly required is to attach the search coil and lower stem to the upper stem and control housing.

1. depress the button on the upper end of the lower stem and slide it into the upper stem. Push the lower stem up so that the button snaps into the third hole from the end of the upper stem.

2. Wind the search coil cable around the stem as shown.

3. Install the coil connector into the mating connector on the control housing.


This detector requires four 9 volt Alkaline transistor-type batteries. (Customer furnished. Such as: Eveready Energizer 522 or any equivalent. Access to the batteries is gained by pulling out on the battery doors located on the bottom of the control housing.

The Low Battery indicator light will come on and stay on whenever the batteries need replacing. It will always "flash" momentarily whenever the Power Switch is turned off. This lets you know it is working properly and batteries are good.

An audible warning loud tone that can not be tuned out) will also occur when battery life fall below the usable level. Turn the detector off and install new batteries.


The use of Alkaline batteries is specified for the detector. Alkaline batteries can supply the power needed for the many features and powerful performance packed into the sleek, lightweight Bud case.


The following tips will help you get maximum battery life. Use headphones. Using headphones can be very beneficial. Battery life will be greatly extended. Background noise. such as street traffic. 13 minimized. Targets are easier to hear.

Switch batteries around. Upon installing a fresh set of 9 volt Alkaline batteries keep track of your operating time. After approximately four or five hours use. switch the batteries around. Audio draws one battery side down slightly faster than the other. Thus, switching them around helps insure equal drain.

An audible warning (loud tone that can not be tuned out will also occur when battery life falls below the usable level. Turn the detector off and install new or recharged batteries.

Remember 95% of all detector malfunctions are either due to faulty batteries or poor conditions at the battery clip. Always check your battery condition if you feel your detector is not working properly. After you have connected and disconnected your batteries several times. the prongs on the clip may spread apart or the prongs on the battery itself may spread. Gently squeeze these prongs together with your fingers to insure a good snug fit.

Anytime you are going to store your detector make sure you remove the batteries. Storing the batteries in your refrigerator is the best place for them.

3) POWER/mode

4) Mode toggle

5) GND adjust

Sensitivity: This control is used to reduce the detector's sensitivity to conditions that may cause the unit to respond in an erratic manner. Broadcasting antennas power lines and intense mineralization changes can cause the detector to emit false signals Very large or multiple. closely spaced small trash targets can cause the detector to emit sounds. Generally these signals will sound 'chopped' and will not be repeatable and you will soon learn to recognize them. Turning down the sensitivity control will help reduce the detector's erratic response if the above conditions should ever occur. There will also be some loss of target sensitivity, so always set the sensitivity control as high as you can and yet still maintain smooth operation.

2. DISCRIMINATION/NOTCH: Allows variable rejection or notching of nonferrous trash items.

3. Power Switch: This switch is used to turn the detector ON or OFF. It is also used to select search modes In the DISC position the DISCRIMINATION control is activated. The operator can adjust the DISCRIMINATION control to accept or reject nonferrous target that fall into the pull tab to screw cap range. This range includes some larger gold rings and gold coins in addition to zinc pennies and some older Pennies. In the NOTCH position most pull tabs can be notched out. Iron and light foil will automatically be rejected. In the AUTO NOTCH position most pull tabs, screw caps, iron and light foil will automatically be rejected Thus, the detector will generally respond to COINS.

Pinpointing and Mode Toggle Switch: This is a three (3) position switch with one 1 ) 'momentary' and two (2) 'lock' positions. The center 'lock' position is the ALL METALS pinpointing mode. From this center position the momentary' position can be used for instant retuning or faster detuning of the ALL METALS auto pinpointing mode. The second 'lock' position (away from center places the detector into its normal silent search motion mode.

5. GROUND (GND: This control is used for adjusting out the effects of mineralized ground or the effects of saltwater.

6. BLANKER: This is the variable control that sets the amount of surface blanking from 1 to 4 inches. the operator can then search only for those coins that are deeper than what the blanker is set for. When the Blanker is not used, the control should be turned all the way left until it "clicks" off.


ATI - Audio Target Identification: When operating in the GND/DlSC mode the detector automatically ignores (rejects) iron and most foil trash, when foil rejection is selected. All other metal targets will cause an audio response. Through ATI these targets can be placed into three general categories for identification of the detected item.

The chart demonstrates various targets and their corresponding tone l.D.'s.


N0 Low response tone

Medium tone

High tone


Your new detector has been designed with simplicity and optimum performance in mind.

1. Sweep the search coil as shown:

NOTE: This detector relies on motion to activate the GB Disc Mode.



2. The presence of any nonferrous metal will be indicated by an audible signal each time the coil is passed over the buried objects

3. To locate the object for recovery, set the mode toggle to "ALL Metals:' Position the coil (as shown over the object at point of loudest response.

4. To continue hunting, return the mode to 'DISC.' If, due to ground mineralization, a more precise ground adjustment is needed or you would like to search in the All Metals mode, the GND ADJ. should be set as follows:

a. Make the ground adjustment in a spot devoid of metal.

b. With the search coil about 12 inches above the ground--switch the Mode Toggle to All Metals (center position).

c. Lower the coil near to the ground If mineralization is present, the detector's tone will increase in volume

d. Turn the GND control counterclockwise (CC') to about the word "Ground. "

e. Raise the coil back up, 10 or 12 inches, and press the Mode Toggle to 'TUNE' and release it.

f. Lower the coil back near to the ground again If there is still a change in the tone. repeat steps 5 and 6, each time making a minor adjustment to the GND control until there is no change in the tone.



If the Ground Balance Control is not correctly set, moving the loop up and down will cause a significant change in the threshold audio.


With the Ground Balance Control correctly set there will be little or no change in the threshold audio as the loop is moved up or down near the ground

The detector is now ready to operate in the All Metals mode In this mode any metal (ferrous or nonferrous) will be detected

SALTWATER BALANCE: To balance the effects of saltwater use the same general procedures as used for ground balancing. The difference is that the GND control will balance salt around the counterclockwise area of its range.

NOTE: If there is difficulty in making the adjustment you may be over a hidden metal object Move to another area and try again.


FOR ALL METAL TUNING always push MODE switch to SET/TUNE, then release to center position. FOR DISCRIMINATE, place MODE switch in Pre-Set Disc. position.

1. Power/Mode Switch: This is a four position rotary switch which basically turns the detector ON and OFF. The OFF position cuts off all power to the detector. The DISC position of the switch, in conjunction with the Variable DISC./NOTCH control, functions as a standard variable GB Discriminator. The NOTCH position of the switch, in conjunction with the variable DlSC NOTCH control, functions as a rejection NOTCH. The AUTO NOTCH position is a fully automatic setting. The detector will automatically ignore the most common forms of trash and the newer zinc penny.

2. Mode Toggle: This is a three position toggle switch with two 'lock' positions and one 'momentary' position. The 'center' lock position is the ALL METALS mode. From the center ALL METALS position the toggle can be pressed into the 'momentary' position and released to quickly retune the ALL METALS if needed Or the toggle can be 'held' in the momentary position for DISC and NOTCH operation. The 'lock' position away from center is used for normal DISC and NOTCH operation.

3. Sensitivity: The primary function of this control is to reduce the detector's sensitivity to those influences that could make the operation more difficult for you. There are some things that can cause the response of the detector to become erratic as you are using it. Normally you will not hear any sound from the detector unless you pass the search coil over 8 good target Sometimes a multitude of closely spaced, smaller rejected trash targets can cause the detector to emit choppy, stuttering sounds CB radios. broadcasting antennas, intense mineralization changes snd other sources of electrical noise can also cause the detector to emit false signals The false signals will generally sound 'chopped' and will not be repeatable 80 you will not have any trouble recognizing them. They can be distracting though, and turning down the sensitivity control will help. This will also cause a small 1088 of target sensitivity, 80 always set the sensitivity control as high as you can, while still maintaining smooth operation.



Notch REI.



4. DISCRIMINATION and NOTCH control: This variable control allows the operator selective response lo targets that are in the foil/screw cap range. When the POWER switch is set to 'DlSC: the control functions as a standard variable discriminator. As the control is increased from its full

counterclockwise position, iron, foil, nickels, pull tabs., screw caps, pennies and dimes will be rejected in that order.

Often it is desirable to eliminate some pull tabs without also rejecting nickels, since many types of gold rings are also rejected along with the nickel.

This can be done by setting the POWER switch to 'NOTCH;'. The DISC; NOTCH' control now functions as a variable notch rejection window., he notch can then be adjusted to reject, or 'notch out.' selected types of pull tabs or other trash. When using the notch feature, most iron and small foil will be automatically rejected by the discrimination circuits.

To set this notch, use a pull tab of the type to be rejected Adjust the NOTCH;1 control to the point at which the tab is notched out, or rejected Now check a nickel to be sure it is still accepted. Note that some pull tabs or tab pieces have nearly the same detection properties as nickels and some gold rings. These items can not be separated.

5, BLANKER CONTROL& TOGGLE: The Pro II metal detector features automatic detection of deep coin targets, while at the same time ignoring all shallow surface targets and trash. Most experienced Th'ers know that the majority of trash targets they encounter are shallow--generally less than three inches deep. They also know that most older coins, rings and other relics are often deeper than three inches.

Until now, the detector sensitivity to targets could be reduced only to deep targets but not to shallow often less desirable targets. This is just the opposite of what most experienced TH'ers wanted.

The Blanker control activates an automatic circuit which reduces, and in most cases completely eliminates, detection of all shallow targets and trash. Yet, maximum sensitivity and discrimination of the deeper targets is still maintained.

The following is an illustration of the old sensitivity control system and the new Blanker feature.

Sensitivlty Control (reduced)

Surface Blanking (Set at 3")

No detection deeper than this point

No detection first 3", detection past 3" to maximum depth

BLANKING To use blanking, simply set the variable blanker control to the desired depth and turn the blanker "ON." CAUTION: When using the 3 and 4 inch blanker settings the SENSITIVITY control must be set at maximum, or as near maximum as conditions Permits If the blanker setting exceeds the sensitivity setting nothing can be detected. Besides being useful in locating only deeper targets, the blanker can also be used as a depth indicator. When searching with the blanker ON, any detected 'good' target must be deeper than the blanker setting

The blanking feature can be a valuable tool in locating the deeper, often more valuable targets However, a word of caution--use of the Blanker feature can eliminate detection of most all shallow items Including newer, recently lost coins and rings. In addition, if there are very few or possibly even no deep coins in the area being searched, then It is possible you could search for hours and not recover a single coin.


6. "AUTO NOTCH"" is a unique automatic, auto notch windowing system. When the power switch is set to AUTO NOTCH--the most common forms of trash will automatically be ignored by the detector. At the same time the most commonly found U. coins, including the nickel, will automatically read "good".

Note, however, that the new zinc pennies and some older, thin, copper pennies are rejected by the windowed area These items will normally not be detected.

If you want to find a lot of coins without wasting time on trash or zinc pennies, then this is certainly the mode to use.

7. GND ADJ.: This is a "one turn" variable control. The control can be used to adjust (balances out the All Metals mode's response to mineralized soils or saltwater. However, for most land and freshwater uses, the 'preset' setting of the control may provide satisfactory performance when mineralization is low.

The basic method for "balancing" this detector has already been explained.


The detector should be held in a position that is comfortable for you. Sweep the detector from side to side in about a three foot arc The Bounty Hunter does not need to be hurried, so go at a pace that doesn't wear you out.

Sweep in a slightly overlapping pattern as shown. Use as you would any normal detector --the search signal should 'Peak' as the target center is passed. Try to keep the search coil parallel to the ground at all times and avoid lifting the coil off the ground at the end of each swing. This will prevent 108s of detection of some deeper targets, since you are putting more distance between the coil and the target on a careless swing.

In areas with well-kept lawns. sweep the coil as close to the ground as possible without touching. Hitting the ground or rocks may cause a false signal much like a desired target would sound. Sweeping the coil too high above the ground results in a loss of depth.

When operating the detector. some false signals may occur at the end of your swing. At the point where the coil reverses direction, the detector is most susceptible to trash induced noise. There are ways to tell whether these noises are deep good signals or trash. The first is by repeatability. Trash-induced signals will not be repeatable as you swing the coil over the suspected target several times. while a good target response will be repeatable. You may also want to use the Blanker to ignore the surface targets. Another method is to switch to ALL ME--TALS mode and check the target response. If the response is weak, it may well be a deep good target, but if it is very strong, it is probably trash.

If the trash in an area is so heavy that you are getting a lot of choppy sounding false signals, you can get better results by slowing down your sweep speed and using shorter sweeps. It is also helpful to hunt areas twice, the second time at right angles to the first time. This will allow detection of some targets that were hidden by trash the first time due to the sweep direction.

If there is any doubt whether a target is good or not, DIG IT.

If you don't dig any junk at all, you are surely passing up good finds too.


NOTE The search coil must be moving to detect a target using the DISC or NOTCH system. However, the detector operates very efficiently, even at very slow speeds.

The DISCRIMINATION MODE is not affected by the ground mineralization, and when used at the beach it will go from wet sand to dry snd back without changing tune. The DISCRIMI NATION MODE is recommended for areas of heavy surface trash. Any level in this mode will reject small surface area targets such as wire, nails tacks and rivets--that to other detectors may look like coins. Larger junk targets are easily identifiable because of their erratic signal or widespread signal area

Often you will receive a signal from a target that is difficult to 'read' to really determine what it is. What may seem to be a baa target because of the signal pattern, may be a combination of targets

Let's take an example: With the detector set in the DISC MODE and DISCRIMINATION level set to reject pull tabs

With the audio signal produced at first you may be tempted to pass on and forget it. Don't. A situation like this may be worth an investigation.

1. Switch to the ALL METALS (VLF) MODE for pinpointing.

2. sweep the search coil across the target area in both directions to see if you can isolate the signal into more than one target.

3. If you do determine that there is more than one target present, try sweeping the coil over It at a more favorable angle in the DISCRIMINATION or NOTCH MODE to get a more reliable reading.


While searching in DISCRIMINATION/NOTCH, an iron bottle cap may 'blip,' but can be identified quite easily.

Once a target signal has been received, take notice of its audio strength and your sweep direction. Now sweep over the same target at 90° to the first sweep and compare the strength to the first response. If the signal diminishes at all, you may leave it for a bad target (iron bottle cap). However, it It remains strong, it is a good target. With very little practice. this procedure will become second nature and you will begin to experience the real joy of using your detector.

Accuracy: Although your detector is very accurate on finding coins it is not perfect. Certain items that may read 'good' on other detectors will also read 'good' on ours. An example of this would be a pull tab that detects like a large gold ring.

Halo Effect-: Gold and silver coins don't oxidize much so they have very little halo effect. However, nickels and pennies do oxidize quite a bit and this oxidization surrounds the coin and not only makes the coin appear more conductive it makes the coin appear larger than normal.

Some nails, nuts and bolts and other iron objects such as old bottle caps), oxidize very much and the halo effect around these iron objects makes them hard to reject. Try sweeping the loop at different directions over the target. A good target will have a fairly stable reading whereas a bad target will usually not.

Freshly buried coins may not respond exactly the same as coins buried for a long time.




Insensitlve detectors are very easy to use. However, you may not find much with them because generally they do not respond to much of anything.

By contrast, the Pro II is a very sensitive, deep seeking detector. It will loudly respond to many weak signals that most detectors will not even sense, or at best only whisper on; signals that if missed may mean lost valuable treasures.

However, this also means increased response to trash-induced signals and other sources of interference. At first these responses may seem confusing. One key to handling high sensitivity settings is "signal repeatability." As you sweep the search coil back and forth over the ground learn to recognize the difference between the signals that occur at random and signals that are stable and repeatable.

When searching very trashy ground, it is best to scan small areas with slow, short overlapping sweeps.

At first. concentrate your efforts only on the well-defined, easily repeated stable signals. As you gain proficiency you will then be able to better evaluate the more questionable signal responses.

Some trash items may have the same detection properties as the coins and rings you are searching for. A metal detector looks at the electrical properties of a target, not at its value.

Learn to recognize the "good" repeatable target signals from the often chopped or nonrepeatable signals that may occur when sweeping the search coil over very trashy ground

Check suspect targets from different sweep directions to determine the most reliable reading. When in doubt, recover the target and always check for any additional targets.


PROPER CARE FOR YOUR DETECTOR... Metal detectors are sensitive electronic instruments. Although it does not have to be babied reasonable care must be taken to help ensure a long trouble-free life for your detector.

KEEP IT CLEAN ... Take a few minutes after each use to remove dirt and dust. Wipe the housing and wash the coil, especially if it has been dipped in saltwater. A plastic bag over the control box at the beach will help protect the unit from sand and prevent corrosion due to salt air.

KEEP IT COOL... Never store your detector in an extremely hot environment such as an automobile trunk in the summer. for extended periods of time. The prolonged heat will not only shorten battery life considerably, but can cause electronic components to break down.

KEEP IT SAFE... Never transport your detector in such a manner that will subject it to extreme vibration or shock. The unit may the cushioned by wrapping it in a blanket or by putting it in a carrying bag or case designed for that purpose.

COIL . . . The coil is waterproof and may be submerged in either fresh or saltwater. Caution should be exercised to prevent water from entering the chassis. After the coil is used in saltwater, the coil should be rinsed well with fresh water to prevent corrosion of the metal parts.

EARPHONES... The use of earphones will benefit you in two ways. Most earphones will very effectively block out most of the ambient noise. such as traffic noises and wind noise. which will enable you to better hear the fainter signals caused by the deeper targets. Secondly, using earphones will greatly extend the battery life, since it takes much less power to operate them. Any good 8 or 16 ohm set with 1/4" stereo jack will do.

The following service tips may help if trouble is encountered.

1. The detector will not operate (dead):

a Check battery condition.

b. Check controls for intermittent operation.

c. Check the loop cable connection to case.

2. Erratic Operation:

a Check battery condition.

b. Check to see that the loop cable is wrapped snugly around the rod and properly connected

c SENS set too high.

3. Constant Oscillating Tone:

a This effect can be caused by external electrical sources such as--power lines, television sets, CB radios and/or other nearby detectors.

4. The detector 'drifts' or slowly changes in tone: a Sudden temperature changes can cause 'drift'--allow time to stabilize. Component failure can cause rapid steady drift.

5. No sensitivity or poor accuracy

a The DISC Target l.D. modes rely on motion to produce a sufficient signal for activating these circuits.

b. Heavy mineralization can reduce the accuracy of the TARGET IDENTIFICATION readings.

c. Check battery condition.

6. One or two hour batterv life: a Use of standard 9 volt general purPose or nickel cadium batteries may result in very short life and diminished performance.

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