Operating frequency (for metal detector)
The operating frequency is a key aspect in the design and functionality of metal detectors because it affects how deep and what types of metal objects the detector can identify. Different frequencies have different characteristics that affect the behaviour of the electromagnetic field generated by the detector:
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Low frequencies (e.g. 3-5 kHz) penetrate deeper into the ground and are better at detecting large and medium-sized metal objects such as older coins and large artifacts. These frequencies are also less sensitive to soil mineralisation.
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High frequencies (e.g. 15-20 kHz and above) are more sensitive to small metals such as small gold jewellery, needles and small coins. These frequencies have a better ability to distinguish between different types of metals, but their range is less deep compared to lower frequencies.
Advantages of multi-frequency detectors
Multi-frequency detectors, such as the Minelaby Equinox and Manticore, combine the advantages of different operating frequencies in one device. They offer several key advantages:
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Flexibility: users can switch between different frequencies or use multiple frequencies simultaneously (Multi-IQ technology), allowing the detector's performance to be optimised for specific search conditions and targets.
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Performance. This leads to more accurate identifications and fewer false signals.
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Efficiency: Multi-frequency detectors are generally more effective in a variety of terrain types, from mineral-rich soils to saltwater, making them ideal for use in a wide range of environments.
The difference between single frequency and multi-frequency detectors
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Single frequency detectors operate at a single, fixed frequency. They are technologically simpler and can be optimised for specific search purposes. However, their capabilities are limited by the type and size of metals they can best detect, and they are also more susceptible to interference from soil mineralisation.
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Multi-frequency detectors offer the possibility of using different frequencies simultaneously or adapting them as required. This flexibility means they are suitable for a wide range of prospecting activities and terrains, from gold prospecting to beachcombing. Multi-frequency systems provide greater accuracy, better target discrimination and generally greater depth of detection.
Specific advantages of high frequency single frequency detectors for gold prospecting:
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Better sensitivity to small objects: high frequencies are much more sensitive to small gold pieces that may be missed by detectors operating at lower frequencies. This sensitivity is key when searching for gold in areas where small gold nuggets are common.
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Resolution in mineralized soils: In areas with high levels of mineralization, such as gold-bearing areas, high frequencies can better handle ground disturbance and reduce false signals, allowing users to focus on true finds.
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Increasing the chance of a find: While high frequencies may not offer as deep penetration as lower frequencies, their ability to detect smaller gold particles increases the chances of a successful find in gold-bearing areas.
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Gold Specialization: Detectors designed for gold prospecting are often equipped with special features that further improve their performance at high frequencies, such as different gold detection modes and special filters to eliminate interference.
High frequency single frequency detectors are therefore ideal for gold prospectors who need maximum sensitivity to small gold nuggets