IMPORTANT INFORMATION TO KNOW BEFORE PURCHASING A DETECTOR
Metal detectors�How they work and which one should you purchase?
For the sake of being brief and not to tire our audience lets just say that there are currently 3 main types of metal detectors on the market.
1- 1- VLF detectors: This type of detector can be ordered from detector specialty stores or even purchased in department or retail stores are grouped under the category of VLF (very low frequency) detectors. They account for 99% of the detectors on the market. These detectors specialize in discrimination of metal objects close to the surface (small objects and coins). The performance varies from attaining depths between 0 to 14 inches maximum for large targets. If the target is below maximum depth, with some exceptions, it will no longer give an audible signal or even cause a variation in the threshold tone. The manufacturers are unable to improve this system to ensure attaining greater detection depths with the detector. All manufacturers make outrageous claims about how their particular brand is improved and the deepest but this is merely marketing hype and they cannot hold up to realistic tests of their equipment. In order to detect targets at greater depths your best bet is the pulse induction detectors that prove themselves time and again in test after test.
2 � 2 coil detectors (2 box detectors): For example the Gemini, TM900, or Thor are actually VLF detectors in which the coil wiring is separated in two pieces in order to make two large coils, one for transmitting and one for receiving. They are more powerful but also more expensive, difficult to use, unstable, difficult to adjust and adapt to changing ground conditions. A North to South sweep will almost always cause a 5 degree shift in ground balances without the operators knowledge. Most professional treasure hunters that fall for the marketing hype start out with this type of detector but quickly realize their limitations and defects.
3 � The Pulse Induction detectors (PI)
The Pulse Induction detectors were invented at the early part of the century and appeared on the market long before the VLF detectors. The First World War lead to the development of early American mine detectors but since then there have been huge improvements in pulse technology making it the technology of choice for professionals. Pulse frequency varies from 500 to 3,000 PPS (pulsations per second) depending on the make and model. In relation to their power and the size of the detection coil, they are able to locate under ideal conditions a large metal mass at depths up to 10 or 13 feet. By comparison, a VLF detector detects, with some exceptions, targets up to a depth of 10 to 12 inches. Pulse detectors are less sensitive to the mineralization of the ground than a VLF (Very Low Frequency), i.e., a quasi detector used for recreation or play that you will not find in the Pulse Induction trade. The sensitivity of the Pulse detector in regards to ferrous objects is equal to the VLF but the latter has a system of discrimination which allows it to reject iron to a certain degree especially small ferrous targets which can be ignored in the �Discrimination� mode. However, they are unable to ignore ferrous targets of a certain volume, or shape such as soda or food cans, iron rings, horseshoes, pieces of agricultural instruments, bottle caps, old tools, containers, cans, or scrap metal which will be robustly pointed out as a �good target� unless you lower the sensitivity of the detector to a degree that makes it impossible to locate a large gold coin such as the French Gold Louis De Orr at no more than 3 or 4 inches. The price you pay for the discrimination on a VLF detector equates to a big compromise on depth. On the other hand, the Deepers MF is equipped with a rejection system for important ferrous targets (same ones mentioned above) located in the first 16 to 20 inches of depth, where most of the modern trash without any value is in plentiful supply. This system eliminates 100% of the undesirable surface trash while maintaining its capability of finding deep and possibly valuable (ferrous or non ferrous) targets at great depths. Deeper iron targets are more than likely valuable targets placed at a greater depth in order to hide valuables for example, an iron pot containing gold coins, an iron or iron bound chest with treasure or even an iron meteorite that buried itself deep on impact. Other Comparisons: the VLF detectors are passive measuring apparatuses that merely measure magnetic anomalies at ground level (10 to 12 inch maximum depth), they consume very little energy (30 to 40 mAh that affords the user 40-50 hours of continued use. Pulse detectors are active apparatuses which emit strong induced currents that penetrate deeply into the ground (up to a depth of 10 or 13 feet), they consequently consume more power that is directly proportional to their energy �greediness� (180/200 mAh or 18 hours of detecting with our very latest model, the new Deepers MF).
Final important technical detail: The VLF does not have a great ability to detect gold (a coin made of this metal will not be easily detected if at a depth of more than 6 inches). The Deepers MF has an internal clock that is finely gauged to have an 8 micro second (delay) that enables it to easily discover objects or coins made of gold (or other noble metals) with exceptional accuracy and speed and double the depth of any other detector currently on the market.
From a single small gold coin found at a depth of more than 12 inches to an ancient silver plate found at more than 7 feet under ground, the pulse detector is the best option for discovering deeply buried metals without the risk of missing or passing over a good deposit (they exist by the thousands out there�and yet undiscovered). Other types of inconsistent detectors exist, are very expensive, difficult to use and not very effective for locating buried metal. The GPR or ground penetrating radar is the most notable example. Deepers�your best option for consistently locating deep and valuable targets.
For further information please contact our Deepers technician karl Backus: [email protected]
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