FIELD TEST

The Master Hunter 7 Ads By Garrett
By Jim Martin
From Page 52
July, 1985 issue of Lost Treasure

Joining the list of metal detec-tor sophisticates detectors with the ability to show and tell pertinent information about buried targetsis the Master Hunter 7 A.D.S., currently the top-of-the-line model in the Garrett fam-ily of VLF-Discrimination detectors.
The 4x2-inch multi~purpose meter mounted at the top of the control housing does the showing. The Mas-ter Hunter 7s special Coin Alert circuitry, which sounds off with a distinct audio signal when a goodie is encountered, does the telling. These two bonus features have been added to make the Master Hunter 7 A.D.S. the numero uno model in the Garrett line.
Designed as a general purpose treasure hunting instrument, the Master Hunter 7 A.D.S. offers two separate search modesthe Ground Elimination/All Metal mode for use when the operator wishes to receive signals from all types of metal ob-jects, and the Automatic Ground Elimination/Trash Elimination mode for use when coins, tokens,
rings and other types of jewelry are the primary targets. The operator can change mode quickly with a simple flick of the Master Control Switch positioned at the end of the carrying handle. This same toggle switch is used when pinpointing buried targets and taking readings on coin depths, and also retunes the detector to the original threshold setting each time it is pressed.
Located in the recessed panel on the left-hand side of the body is a septette of knobs and switches which enable the operator to properly adjust the Master Hunter 7 A.D.S. to cope with local search conditions when-ever the situation warrants. Yet be-cause such a degree of fine tuning is probably the exception and not the rule, the manufacturer has conve-niently provided suggested initial settings on both the Trash Elimina-tion and the Power/Depth controls to program the instrument for imme-diate use.
The Ground Elimination knob does not offer an initial setting be-cause it is a 10-turn control which
makes it impossible to preset. There is no stop to let you know when you have reached either the top or the bottom of the 10-turn control range, but heres an easy way to determine the middle-of-the-mad position to be used as a starting point.
Rotate the control knob a full 11 turns in either direction, which will bring you to either the top or the bot-tom of the range. Now, reverse the procedure and turn the knob five full revolutions in the opposite direction.
You will now be in center of the range.
Using this position as a base, fol-low the standard ground adjustment procedure by making compensating adjustments of the Ground Elimina-tion Control while performing the customary up and down movements of the search coil. When the audio signal is the same in both the raised and lowered positions, the instru-ment has been ground balanced.
While proper ground balancing is essential for optimum performance when operating in the All Metals mode, it is not required when search- ing in the trash elimination mode. Simply turn the Power switch on to activate the circuitry, press the tog-gle switch to the right to move into the discrimination mode, and com-mence search operations.
Depending upon your preference, you can operate with a slight thresh-old tone or run silent. I lean towards a slight sound, partially out of habit, but also because I feel that by so do-ing I am better able to hear those so-called faint whispers which indi-cate deeper coins.
To establish the desired threshold level, adjust the slotted control marked Audio. Adjacent to it is the Tone control which allows the opera-tor to adjust the pitch of the signal to that most pleasant to his or her ears. Theres certainly a wide enough range between the squeaky highs and the guttural lows to satisfy the most discriminating of audio preferences.
Operators are afforded a choice of either manual or automatic tuning by means of a quick-flip toggle switch on the side panel. When the switch is up, you are in automatic tuning; when down, its manual. Automatic tuning is possible only when the in-strument is being operated in the ground elimination/all metal mode. This posed no problem to me be-cause I prefer using manual tuning whenever possible, figuring that my busy thumb on the toggle switch is retuning the instrument anyway.
Another side-mounted toggle switch marked Audio Coin Alert is used to activate the circuitry which provides that welcome sound of suc-cess indicating the presence of a good target. Its the Garrett version of the same good target signal I found so beneficial on the Whites motion-detectors and the units in the Fisher l200-X series. I really get a kick when a detector provides a dis-tinct signal to tell me that a treasure is hiding beneath the turf.
In the instruction manual and their promotional literature, the Garrett folks describe the sound as being a bell-like tone, which led me to believe I would hear some type of a high-pitched dinging or ringing. However, I soon discovered that the sound is more of a low, resonant bong. However you choose to de-scribe it, the response is a sound I enjoy hearing and the fact that a de-tector is able to audibly call my at-tention to the presence of a target certainly adds to the fun of coin-shooting.
To better appreciate the Coin Alert in action, try this simple air test. With the Power and Trash Elimina-tion controls set at indicated initial positions, pass a pull-tab, screw cap, penny, dime and quarter across the face of the loop. Notice how the trash items produce a rather sharp re-sponse, while the coins evoke a vi-brant ring. Thats the sweet music you should be listening for. Inciden-tally, the Coin Alert feature is opera-tive only when the instrument is pro-grammed for searching in the trash elimination mode.
Operating in conjunction with the Coin Alert component is the Ad-vance Target Classification Meter which has indicated settings for nick-els, both zinc and copper pennies, dimes, quarters, half dollars, dollars and rings, as well as foil and pull-tabs.
After the ringing bong audio signal alerts you to the presence of a coin, a quick glance at the meter will let you know its probable denomina-tion. I use the term probable be-cause the needle may occasionally settle slightly off the indicated set-ting on the dial.
For example, during preliminary air checks I discovered that the nee-dle read right on the button when a copper penny, zinc penny and a nickel were used as targets. In the case of both clad and silver dimes and quarters, however, the needle readings were below the indicated settings on the dial. Such readings didnt bother me to any great extent because they seemed to be consis-tent.
To satisfy my curiosity, I checked with the Garrett home office in Gar-land, Texas where Director of Mar-keting Jack Lowry assured me the readings appeared to be normal. So dont be overly concerned if the nee-dle readings on some coins differ slightly from the indicated dial set-tings. Just accept such variances as being part of the coinshooting chal-lenge.
The Master Hunters ability to in-dicate the approximate depth of a buried target adds greatly to my en-joyment of coinshooting. Readings can be obtained by checking the coin depth band of the meter, which is scaled from 1 to 9 inches. Being told the approximate depth of a coin gives me far greater satisfaction than sim-ply being told of its probable denom-ination.
The shallow surface readings re-ally dont ring my chimes, but when I see that the little needle has moved to show a depth of 4 inches or more, I quickly get into the spirit of the oc-casion. In the locations where I am accustomed to searching, a coin at such a depth can easily turn out to be a silver prize.
Depth readings can be determined by pressing the Master Control tog-gle switch to the left and holding it in this position while moving the search coil back across the surface of the ground directly above the pinpointed target area. The needle will move out to the approximate depth and remain here until you release the switch.
Although the Advanced Target Classification meter certainly en-hances the enjoyment of coinshoot-ing, I have a hunch the engineers for-got about left-handed persons when the design was on the drawing boards. While the meter is easy to see and interpret when I hold the de-tector in my right hand, it becomes obscured when I use my left hand to grip the handle. A repositioning would be a big advantage if incorpo-rated into a future design change.
To demonstrate the coin sniffing capabilities of the Master Hunter 7 A.D.S., lets initiate a simulated search mission. Ill bring along my test unitSerial #1023-106. You se-lect the spot, preferably a lawn that dates back to the days when silver coins were in general circulation. Ill also bring along my coin gun for re-covering deeper targets. Lets be sure that the soil is moist at the time of our hunt.
Well launch the project by adjust-ing the control knobs to the initial settings as indicated, flicking the Au-dio Coin Alert switch upwards to the on position, and adjusting the audio control until a faint threshold sound is established. If you prefer running silent, dont hesitate to turn the audio control clockwise until the threshold disappears. Performance should be about the same with or without a threshold sound, although as indi-cated earlier, I like to hear a faint hum.
If relic hunting was our primary objective, wed press the Master Control Switch to the left to activate the All Metal mode. The next step would be to complete the customary ground balancing process. Because we are after coins, however, we can forget about ground balancing since the detector will perform this func-tion for us.
To activate the Automatic Ground Elimination/Trash Elimination mode, well press the master control switch to the right and release.
The detector is a motion machine, so well commence searching by sweeping the loop slowly back and forth just above the surface of the lawn. Since the cone-shaped search beam is small, the chances of picking up a deeper target will be greatly en-hanced by moving the coil with over-lapping sweeps. Although a surface coin offers a rather broad target, you must be right on the button with the tip of the cone to obtain a response from those which are hidden several inches down.
Listen attentively for that vibrant bonging of the Coin Alert which indicates that youve found a good target. When you hear this Sweet Sound of Moneyas the Garrett copy writers call itcheck the meter to determine the probable denomina-tion of the target.
Now press and hold the Master Control Switch to the left to activate the electronic pinpointing circuitry. Next, pass the loop back and forth over the target area as to zero in on
the hidden coin. After determining the exact location of the target, you can determine the approximate depth as follows.
Move the search coil away from the target. area, then place it directly on the ground surface. While holding the Master Control Switch to the left, make a sweep back over the spot. The needle of the meter will move out to indicate the target depth.

By the way, don't worry about try-ing to remember the different posi-tions of the Master Control Switch and their functions. Details are shown clearly on a little yellow in-struction panel positioned on the top of the control housing.

Another bonus feature of the Mas-ter Hunter 7 A.D.S. that will be ap-preciated by budget-conscious beepers is the rechargeable ni-cad battery system that comes as stan-dard equipment. The four-cell pack which holds the ni-cads (Model #16047) has been designed to replace the six-pack of standard 1.5-volt caibon-zinc batteries that was used to power the Master Hunter ADS Ill. But just in case the ni-cads go kaput while you are on a search mission, a six-pack of 1.5-volt batteries (Model #23088) is supplied with the unit as a back-up.
More good news. That little plastic battery compartment cover on the ADS III has been replaced by a sturdy metal cover that is held se-curely in place by a pair of thumb screws.
The conditions of the batteries is checked automatically each time the power switch is activated. As soon as the switch clicks on, the meter nee-dle goes through its little battery-checking routine. In case the ni-cads need some juicing its a simple matter to open the compartment and plug in the recharging unit while the battery pack is still in the detector.
Can a Master Hunter 7 A.D.S. play a role in your future treasure hunting adventures? Why not drop by your local Garrett dealer and ask for a demonstration. For the name of your nearest dealer call the toll-free telephone number 1-800-527-4011. (Residents of Texas should call 1-
800-442-4889.)
Plan your visit at a time when the dealer has the time to explain each feature fully, and hopefully allow you to try out the instrument at a lo-cal park, lawn or test plot. By so do-ing you can obtain a feel that should answer your question.
But dont expect to become an ex-pert with the detector overnight. As the instruction manual clearly states:

After you have operated your Master Hunter 7 A.D.S. for only a short time, you will become very re-laxed and proficient with the detec-tor. However, do not expect to achieve the best efficiency and suc-cess until you have operated the de-tector for at least 100 hours. Of course, the longer you use the detec-tor, the better and more successful you will become.
Now I consider that sage advice no matter what make or model of detec-tor a person chooses to use. When you get to the bottom line, the key to success when coinshooting lies in practice, patience and persever-ance.D
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