The size and depth of the magnetic field is determined by the shape and size of the searchcoil. It generates a magnetic field and senses metallic targets in the surrounding environment. The searchcoil is a vital part of your metal detector. Part 1 covered search coil size, shape and depth. It’s important to know the benefits of using various size, shape and configurations of coils because simply changing the search coil on your metal detector is the next best thing to buying a whole new machine! Garrett is the global leader of ground search metal detectors, pinpoints, coils, and other accessories. For this reason, it is highly recommended when hunting over mineralized ground commonly found when prospecting and relic hunting. The Double-D will, however, significantly outperform the concentric coil over mineralized ground. Because of its small positive detection field, the DD is inherently less sensitive than a concentric searchcoil of the same size, over non-mineralized ground. It is this canceling field that allows the DD coil to maintain performance over mineralized ground. The remaining portion of the coil actually produces negative (i.e. The positive detection fi eld of the DD runs beneath the overlapping center section from front-to-back. This configuration is called DD because both TX and RX coils are in the shape of a “D”. With the Double-D, it is the arrangement of the TX and RX coils that produce a canceling effect of ground signals. The Double-D configuration is designed to significantly reduce ground interference and, thereby, recover the performance lost by a concentric coil over mineralized soil. Only the Garrett GTI metal detector offers this technology.ĭD Search coils have two smaller “D” shaped coils housed inside to penetrate heavily mineralized ground that is commonly encountered while gold prospecting and relic hunting. With this additional sizing information, the detector can more fully characterize a target and for the first time distinguish between trash and good targets of the same conductivity (e.g. This extra coil provides the detector with additional target information necessary for true target-depth perception and true target-sizing capabilities. The detection and performance characteristics of the mono are essentially the same as the concentric in that it provides the maximum possible sensitivity, but suffers some performance in mineralized ground.Īn Imaging searchcoil is an enhanced version of the concentric configuration that features an additional RX coil. The mono-coil can be manufactured with the TX and RX coils located together or as a single coil acting as both TX and RX. Unfortunately, this configuration is the most susceptible to interference from ground minerals, which results in substantial loss of performance when used over heavily mineralized ground.Ī mono-coil is available only on Pulse Induction detectors, such as Garrett's new Axiom Metal Detector, and is a variation of the concentric configuration. For these reasons, they are the most commonly used searchcoil and will provide the best overall performance in most environments. In addition, concentric coils also provide the most symmetrical detection field, allowing ease in pinpointing and consistency in target identification. This provides the largest possible detection fi eld and greatest detection depth, making the concentric coil potentially the most sensitive confi guration available. The advantage of this configuration is that both the TX and RX coils are wound as large as possible within a given searchcoil diameter. The concentric configuration consists of a TX coil and RX coil which are usually circular. The most common configurations are: Concentric, Mono, Imaging, and Double-D. The configuration of a searchcoil refers to the arrangement of the Transmit Coil (TX) and Receive Coil (RX) within the searchcoil shell. In addition to searchcoil sizes and shapes, there are also a variety of searchcoil configurations available, with each proving to be the best choice depending on hunting applications and ground conditions. Sometimes changing the search coil on your metal detector is the next best thing to buying a whole new machine! It is possible that merely changing the coil on your detector will lead you to a host of new targets. A change in any one of these variables may require a different searchcoil. The correct one to use depends on the environment it will be used in as well as the targets being sought. There are a variety of searchcoil sizes and shapes and configurations.
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