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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING Tips for organizing the search for coins, gold jewelry, treasures using a metal detector. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / metal detectors Scanning technique When searching, it is important not to rush. Moving the searchcoil straight in front of you from side to side at a speed of 40-50 cm per second, slowly move forward. At the same time, keep the coil level and parallel to the plane of the earth's surface, at a constant level above the ground of about 3-4 cm. Slightly raise the coil above the tops of plants, stones and other obstacles. Each new stroke is separated from the previous one by a distance equal to half the diameter of the search coil. Search methods Apply system search methods! Do not skip the ground at the junctions of the passages! Option 1. Search with 50% swipe overlap. Scanning is performed only in the dynamic mode of the metal detector. With each step - a new swing and forward movement at a distance equal to half the diameter of the search coil. First, you need to survey the area of the field along the longest side, for the entire length in one pass. When you reach the end of the field, you move to the side for the width of the passage across the field and then move in the opposite direction, parallel to the previous passage, etc. Option 2. Search without 50% overlap of sweeps, along a grid-like path. We produce everything as in the first option, with the exception of 50% overlap. Sweep and step forward a distance equal to the diameter of the searchcoil. First, survey the area along the longest side. Then, after you have covered the entire area of the field, you begin to survey the same field again, moving across (perpendicular to the previous route). Note that until the area of the field is surveyed a second time, this search method covers the entire area of the field faster. During this time, you can already find valuable objects, if you're lucky and make a conclusion for yourself: is it worth continuing to scan further or limiting yourself to what was found and stepping into the excavations! Determining the exact location of an object If an object is detected in the dynamic discrimination mode, you need to determine its location more accurately so as not to dig too much for nothing. You can also measure the depth of occurrence if the metal detector is equipped with a depth gauge. To accurately determine the position and depth of an object, depending on the capabilities of your metal detector, the following operating modes are used:
Identification of the exact location of the object requires practice and is best done with "X" shaped movements over the area being examined: Step 1. With a longitudinal movement of the search coil, sweep with a reduced amplitude over the intended location of the object from side to side. Step 2. After the hidden object beeps, visually mark the point on the ground when you heard the maximum beep. Stop the coil just above this point. Step 3. Now move the coil back and forth several times, in a direction perpendicular to the original. The line of this new direction of movement must pass through the first point. Visually mark the spot on the ground again when you hear the beep. Step 4. If different points are marked, it is necessary to repeat movements at different angles in the shape of the letter "X" until all points are completely combined into one. Step 5. The exact location of the object is under the intersection point of all visual lines, above which the maximum sound signal appears when the metal detector coil moves from different directions. This point should be marked on the ground or with a flag and, when convenient, proceed to excavation. Division of the site into sectors and search zones If you only have a couple of hours to first survey a new area of your intended search, a random search can be effective if you're lucky. In places where finds are discovered with particular intensity or you expect to find something specific - for example, "grandmother's treasure", we recommend that you systematically examine this area. There is no point in going in circles and returning to the same point, just wasting time hoping for luck! According to the well-known "law of meanness", you will find anything, but not "TREASURE"! It will remain quietly lying in the ground under a patch of the area that you did not scan, without even noticing how it happened! Step 1. We mark the field area along the longest side, a line on the ground or two pegs at a distance of 12-20 m from each other in a straight line. Step 2. We stretch a cord between them at a height of 15 cm from the ground. In parallel, at a distance of up to 1,2 m, we do the same. Thus, we have marked the lane for the first pass. Step 3. After scanning the first strip, we stretch another cord at a distance of 1,2 m from the checked corridor, on the left or right side, as it is more convenient, and continue the examination along the second strip. At the end, you need to remove the internal marking cord and mark the next lane for the passage with it. By marking the general search area in this way, you will always see what proportion of the area was surveyed and you will be sure that you did not miss anything interesting. In the process of searching using the specified method, you will detect and identify various finds using the discrimination functions of the metal detector. It is recommended not to dig right away, but only mark the location of objects with flags of different colors, sticking them into the ground:
Step 4. After you have examined the entire area designated for search or have checked a sufficient proportion of the area, in your opinion, the time allotted for the search ends, you should begin to clarify the location of the targets and dig out the finds. You need to start with the "red flags". By moving over the place under study in the shape of the letter "X", we specify the location and dig out the finds in turn. Step 5. We proceed to additional identification of the type of targets marked with "white flags". We specify the location and depth of targets. Further work on selection and screening of unnecessary objects is carried out by a metal detector:
It is recommended in places of localization, for better identification of the type of targets, to maintain a minimum gap between the search coil and the ground surface, level the unevenness of the soil, trample down the grass and, if necessary for identification, remove up to 5 cm of soil! Noteworthy objects are response in the form of a constant repeated sound signal during repeated movements of the coil directly above the target location:
Excavations Having examined the field of interest to you with the localization of finds with the maximum possible accuracy, turn off the power of the device (you need to take care of the batteries) and proceed to excavation. It makes sense to dig not only "color" signals, but also iron ones, because such a signal can be emitted by a box of gold coins, an old well-preserved sword or dagger. To dig or not to dig - you decide! As a rule, most objects are located near the surface itself. The depth of occurrence can be pre-measured if your metal detector is equipped with a depth gauge, if not, then this can be done using a probe or a screwdriver. If the search object (coin) is near the surface of the earth, in order to get it, you can not dig a hole, and you don’t need a shovel, but limit yourself to tearing it off with a knife and a screwdriver. In other cases, with a deeper occurrence, you need to dig a find. To do this, first of all, we outline with a shovel a square with dimensions of 20x20 cm. Usually, a hole is dug to a maximum depth of up to 40 cm, while the diameter can reach 40 cm. If you have to dig in the grass, then cut the sod so that it can be carefully removed. Before digging, you need to check if there is anything metallic in the place where we will put the selected soil. If possible, the selected soil should be folded in a place free from grass and bushes. But it is much better to pour all the dug out earth onto a rug made of tarpaulin or an oilcloth made of dense polyethylene measuring 1,5 m by 1,5 m. Already after the very first shovel is taken out, we check if the desired treasure is in the selected soil, if the coin has stuck to the chopper, scoop or shovel. If not, we dig further, repeating the check of the pit with a metal detector when deepening every 5-10 cm. Checking whether the find is in the selected soil is best done in such a way that you do not get up every minute to lift the metal detector. You can lay the metal detector on the ground, and bring the selected soil to the coil in handfuls on a plastic spatula. There should be no metal on the hands and fingers when they come close to the coil! Don't forget to take off your watch! Metal buttons and zippers on the sleeves of shirts and jackets should also be replaced with plastic ones. Having excavated and examined all the designated places of finds, you need to go through this area again, examining the pits and excavated earth. It happens that an interesting signal is found again at a previously excavated site. In such cases, you need to dig deeper and wider (what if there is a treasure there?), Periodically checking the excavation site with a device. In some cases, the depth of excavations can reach 1 m or more. In the process of excavation, you will find valuable items - coins, rarities, gold jewelry. In addition to useful finds, unfortunately, you will dig even more and find all sorts of metal debris. It is best to collect all the garbage in order to bury it in one, fairly remote place after the work is completed. It will be very unpleasant to stumble upon it again. One of the canons of behavior of a self-respecting professional seeker is the elimination of traces of his stay. It is necessary to fill up each dug hole and lay the turf in its place. After reclamation, the examined place should be trampled down and, if possible, masked by sprinkling with leaves. In addition, unfilled pits give a "tip" to other seekers and just curious people. If we want to protect some “our own fish place” from prying eyes, where we regularly find something, then we need to make sure that it does not stand out from the environment. Author: Dubrovsky S.L.
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