Fisher GEMINI-3 warranty Receiver, Sources of Error

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PROSPECTING TIPS

Sources of Error

    The most common nonproductive zones of conductivity are:

1.Dissolved mineral salts - Mineral salts become conductive when dissolved in water. As a result, the presence of saline water or water saturated soil high in salt content, may render the GEMINI-3 useless.

2. Rough terrain - In very rough terrain it may be difficult to maintain the GEMINI-3 parallel to the ground, resulting in frequent false signals.

3.Irregularities in the overburden bedrock - The GEMINI- 3 may detect sharp changes in conductivity which are of no important geological significance.

4.Fault zones - Fault zones often give positive indications because they are highly fractured and usually contain concentrations of water and minerals.

5.Alluvial deposits along creek bottoms - Conductive deposits along 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 scrap iron, tin cans, etc.

7.Magnetite - Heavy concentrations of magnetite will cause false signals and/or loss of penetrating power.

    It is obvious from the above that every response by the GEMINI-3 does not indicate the presence of valuable ore, but rather an indication that the earth’s conductivity has changed. It remains for the operator to properly interpret this data. The successful prospector will have some understanding of the ore he is seeking and of the existing geological conditions. The successful operator will also have studied that area and will know in advance what ore he is seeking and where the best opportunity exists for locating it. Under these conditions, the GEMINI-3 can provide valuable information. On the other hand, random wandering and prospecting for no ore in particular can be an expensive waste of time.

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Gemini-3manual-.ind2 7

RECEIVER

Speaker: Provides audible indication of the receiver signal for balancing and detecting.

Meter: Provides visual indication of the Receiver signal response for balancing and detecting. Also used as a battery test indicator. Sensitivity Control: Used to control 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 plugged in. (Stereo/mono headphones should be in “stereo” position.)

Power Switch: Pulling switch out turns on receiver.

Meter

Speaker

Sensitivity

Control

Battery

Test Switch

Power Switch

Headphone Jack

Figure 3. Receiver

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Contents Gemini-3 Contents About Your Detector SpecificationsBasic Theory of Operation Where To Use Your Metal Detector In The U.STreasure HUNTERS’ Code of Ethics DepthTransmitter Battery ReplacementReceiver Sources of ErrorMapping SearchingProspecting Tips Narrow Scan Inductive SearchOperating TuningConductive Trace Set UpInductive Trace TracingWide Scan Wide Scan Inductive Search

GEMINI-3 specifications

The Fisher GEMINI-3 is a sophisticated metal detector designed for both hobbyists and professionals seeking high-performance in treasure hunting. Launched by Fisher Research Labs, this model offers a myriad of features that make it one of the most popular detectors on the market.

One of the standout characteristics of the GEMINI-3 is its dual search capabilities. The detector is equipped with both a 10-inch coil and a 5-inch coil, allowing users to operate in various terrains and conditions. The larger coil is perfect for searching wide areas, while the smaller coil helps in pinpointing targets in more cluttered sites.

The GEMINI-3 utilizes advanced VLF (Very Low Frequency) technology, which provides enhanced sensitivity to both ferrous and non-ferrous metals, helping users to distinguish between valuable items and common trash. This technology significantly reduces the chances of missing hidden treasures beneath the surface.

Another impressive feature is the detector's digital target identification system, which provides users with a numerical readout corresponding to the type of metal detected. This identification system enhances the hunting experience, allowing users to make informed decisions about whether to dig or move on to the next target. Additionally, the GEMINI-3 boasts multiple discrimination modes, enabling operators to filter out unwanted items like iron and foil while honing in on more valuable finds.

The GEMINI-3 is built for durability and usability. The control panel is user-friendly and designed to facilitate quick adjustments in the field. The lightweight construction of the detector ensures comfort during prolonged use, making it an ideal choice for long treasure-hunting sessions.

Moreover, the detector is powered by a rechargeable battery, providing extended use without the inconvenience of constantly changing batteries. The impressive battery life allows treasure hunters to focus more on their quest and less on equipment management.

In conclusion, the Fisher GEMINI-3 combines advanced features with user-friendly design, making it a top choice for metal detection enthusiasts. Its versatility, technology, and practical characteristics empower treasure seekers to explore various environments efficiently, unearthing hidden treasures with ease.
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