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5

DEPTH

   

The GEMINI-3 was designed to locate large, deep objects such 

as an iron chest, pipe or an ore vein. It will not detect small coin-
sized objects. A quart jar full of coins, however, may be detected 
one-to-three feet deep. A 55-gallon drum may be detected as 
deep as 10 feet. A very large object, like an automobile, may be 
detected at 20 feet or more. 
    The ability of the GEMINI-3 to detect objects at various depths 
depends on several factors: 

1. Ground Mineralization:

 The penetrating power of the 

GEMINI-3 is adversely affected by the presence of 
magnetite (a black iron oxide) and wet conductive 
mineral salts. For example, an object that can be 
detected  at  15  feet  in  neutral  ground  may  be 
detected no deeper than 5 feet in highly mineralized 
ground. 

2. Size and Depth of Object:

 A 4-inch diameter target 

will produce signal 64 times stronger than a similar 
1-inch diameter target at the same depth. An object 
1-foot underground will produce a signal 4,000 times 
greater than the object 4 feet deep. 

3. Length of Time Object is Buried:

 An object that has 

been buried for a long time may be easier to detect 
than a newly buried object. Rust and other oxides as 
well as mineralization caused by the interaction of 
the metal with soil chemicals are good conductors 
and aid detection. 

4. Shape of an Object:

 Ring or looped shaped objects 

lying flat produce the best results. Flat or dish shaped 
targets are also easy to detect. Rod shaped objects, 
especially when scanned on end, are very difficult 
to detect. 

5. Operator Skill:

 Probably the most important factor of 

all, practice over known buried targets is essential. 

20

LET’S PRESERVE OUR TREASURED SPORT!

Laws governing the use of metal detectors are common in some 
areas. In many countries, the use of metal detectors is illegal or 
severely restricted. DON’T LET THIS HAPPEN IN YOUR COUNTRY!

• Always check Federal, State, County and local laws before 

searching.

• Respect private property and do not enter private property 

without the owner’s permission.

• Take care to refill all holes and leave no damage.
• Remove and dispose of any and all trash and litter found.
• Appreciate and protect our inheritance of natural resources, 

wildlife and private property.

• Act as an ambassador for the hobby, use thoughtfulness, 

consideration and courtesy at all times.

• Never destroy historical or archaeological treasures.
•  All  treasure  hunters  may  be  judged  by  the  example  you  set; 

always  conduct  yourself  with  courtesy  and  consideration  of 
others

.

TREASURE HUNTERS’ CODE OF ETHICS

Содержание Gemini-3

Страница 1: ...Gemini 3 Operating Manual 2 Box Metal and Mineral Detector for Deep Search and Cache Locating 1813...

Страница 2: ...ing pg 14 Inductive Tracing pg 14 Set Up pg 14 Tuning pg 14 Operation pg 15 Conductive Trace pg 15 Set Up pg 15 Tuning pg 16 Operation pg 16 Prospecting Tips pg 17 Mapping pg 17 Locating Placer Deposi...

Страница 3: ...1950s The new GEMINI 3 goes 10 to 20 percent deeper than its predecessor It will trace most pipes and ore veins at least 50 percent farther and the new crystal controlled circuitry is rock stable The...

Страница 4: ...uency RF signal down to a conductive object and generate an electromagnetic field around that object When used in any of the Inductive modes the RF signal travels through the ground to the object When...

Страница 5: ...per than 5 feet in highly mineralized ground 2 Size and Depth of Object A 4 inch diameter target will produce signal 64 times stronger than a similar 1 inch diameter target at the same depth An object...

Страница 6: ...e 2 Transmitter Power Switch Pull out switch turns on power Ground Plate Jack Used with the optional Ground Plate Assembly for the Conductive Trace Mode Battery Level Meter Gives a visual indication o...

Страница 7: ...sensitivity level The circled 7 indicates the starting level used for Narrow Scan Inductive Search Mode Headphone Jack Accepts stereo or monaural headphones and silences speaker when headphones are p...

Страница 8: ...Tighten the two center knobs finger tight until there is no wobble Place the transmitter on its back and insert the end of the handle with the single brass shaft into the V shaped slot Turn the knob...

Страница 9: ...ome asphalt you may not be able to use it with the strap fully lengthened You will know this during tuning if you cannot reach a silence null Not reaching a null can also indicate the presence of near...

Страница 10: ...ument properly tuned and held in the hand or suspended by the strap slowly walk directly toward your test object Keep the handle as level and steady as possible while in motion or the tuning may chang...

Страница 11: ...han 100 as you move in half or quarter steps back and forth to get your peak reading 8 If at all possible practice over some buried targets of known size and depth 9 There are several things to consid...

Страница 12: ...e together direct air coupling will result meaning the receiver is detecting the Transmitter signal directly through the air instead of through a buried conductor Set Up Two operators line up at least...

Страница 13: ...ly the same time the receiver tone and meter will rise to indicate its presence The receiver operator should alert the transmitter operator that they have detected a conductive object 3 The receiver o...

Страница 14: ...oth facing the same direction The transmitter should be on the ground and the receiver should be held by the operator Tuning 1 Set the transmitter Power ON 2 Set the receiver Power ON Sensitivity ZERO...

Страница 15: ...pipe each time a T junction or lateral is encountered the signal will split and weaken Conductive Trace This is the best method for tracing a single pipe in the presence of other pipes A portion of t...

Страница 16: ...rating 1 Locate the buried pipe by circling the contact point keeping the receiver in line with the contact at all times Stay at least 30 feet from the transmitter 2 Once the pipe has been located by...

Страница 17: ...and plotted on a map The map should include all creek bottoms gullies outcrops and other physical features The ideal map on which to plot the conductive zones is a topographic and geological map of t...

Страница 18: ...creek beds usually have no economic value or importance in determining the geology 6 Conductive debris Unexpected high readings are often due to highly conductive debris near the surface such as scra...

Страница 19: ...s compartment and do a battery test Refasten the access plate Both the transmitter and receiver will work from 30 to 40 hours on a set of 8 standard quality carbon zinc batteries Alkaline batteries wi...

Страница 20: ...ivate property without the owner s permission Take care to refill all holes and leave no damage Remove and dispose of any and all trash and litter found Appreciate and protect our inheritance of natur...

Страница 21: ...to use your detector Bureau of Land Management BLM Lands Some areas are open for metal detecting and some are not Always check with the district office City or County Park Lands Most are open to meta...

Страница 22: ...dle 1 7 lbs 75 k Frequency RF Search and Trace 81 92 KHz Crystal Controlled Audio Target Response V C O Operating Modes Search 1 Narrow Scan Inductive 2 Wide Scan Inductive Trace 1 Inductive 2 Conduct...

Страница 23: ...oratory does not warrant suitability to specific use Fisher Research Laboratory shall in no event be liable for any direct incidental consequential or indirect damages SPECIFICATIONS Using headphones...

Страница 24: ...this belief with a 5 year limited warranty Proof of purchase is required to make a claim under this warranty NOTE TO CUSTOMERS OUTSIDE THE U S A This warranty may vary in other countries check with yo...

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