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Metal Detecting: Awareness Is Good

January 1st 2007 16:21
Many metal detecting sites are not what they seem to be. The metal detectorist must be constantly aware that what they see is not always what they get. Thats a nice thing.

A man in New England bought 2 metal detectors, one for his son and one for himself. The pair were total novices, but enthusiastic. They decided to try the machines out in a baseball field/city park near where they lived. The youngster, having no preconceived notions, was detecting out near a side road, a place that most other metal detectorists would scoff at. His first coin was of a foreign type and dated in the 1600's. Following a trail of detritus the man and his son eventually found a revolutionary war campsite that had never been hunted before. Some of it was below the area that was now the park.


Many times the earliest homesteads of a city became public property such as parks or ballfields, and also a lot of the older houses in an area were actually built on sites that were even older abodes or farm sites. In Europe this is all multiplied many times, as there may be as many as 10 or more ancient sites built one right on top of the other. Farm fields are many times bonanazs of metallic history in the old world, especially around citys and towns.

By being aware of this circumstance the savvy metal detectorist will be able to use his metal detector as a research device as well as a treasure locator.


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Metal Detecting: Shipwreck Salvage

Something that a majority of metal detectorists do not know is this: Indigenous peoples were the first to salvage shipwrecks along any coast. Find a habitation or trash site of an indigenous peoples near a coastline, that is coincident to a time period where ships were wrecking off the coast, and you will have some of the finest metal detecting that the world has to offer.
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Metal Detector Tuning Tricks

December 30th 2006 19:47


The tuning of a metal detector is very important. Once you get good at that (And you should practice a LOT) you will start finding more right away.

There are variations among metal detectors and each has its own personality. Read the instruction manual as many times as it takes, and also get as much other information as you can lay hands on. I have found some really good tips in the oddest of places, and there is usually something to be learned by even the most seasoned detectorist, no matter how well they know their particular machine. In fact thats one of the really fun things about metal detecting.


One aspect of tuning which many people employ, but many more do not, is operating in what we shall call No-Sound. This means that you adjust your detector to get the minimum threshold sound, via whatever controls are at your disposal. The smaller the threshold sound, the larger and more powerful the field at the the coil.

Once the detector is set and balanced to the ground, and you have the littlest sound, then a slight adjustment is made to make the threshold sound go silent. On Whites a very minimal adjustment to the ground balance will allow this to occur.

This mode of operation allows a detectorist to do away with a lot of the waverings and other confusing sounds. This mode of operation is especially suited for beginners, although it is considered a trick of the professionals because it entails a good working knowledge of ones machine.

The rule when looking for coins and other non ferrous targets can be summed up thus: usually, when you hear a good signal, it is unmistakable. Operating in No-Sound also allows more clear cut delineation between good and bad targets.
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Metal Detecting: Coins On Edge

December 26th 2006 20:36
Metal Detecting: The Spherical Field

Coins on edge are a favorite subject among metal detectorists, and that does provide some good subject matter because many coins actually fall into the ground edge first. It was very difficult to find coins on edge with older detectors, and this was because there was very little coin-surface area exposed to the metal detectors field, by which eddie currents could form and thereby cause the opposition necessary to react with the field. Though it could be done by the adepts, and in clean, worked out, but real good areas, this detection mode has been actively sought by some psychos, to squeeze that last coin of super age and make out of the ground. Gold coins are sometimes deep.

With the advent of the phase analyzation circuit in metal detectors came not only good metal discriminating capabilities but also a more distinct and electronically observable spherical electronic field. A 3D effect. This is how I see it anyway. The simultaneous measurement of the phase which is 180 degrees off the primary signal allowed a greater detection capability for coins on edge. Be aware of those musical flutters! The on-edge coins are certainly at all sites, and this is very fun to think about and do.

Metal Detecting w/ The Transmitter Receiver Circuit

The Transmitter Receiver Mode of a metal detector is a discriminating mode that does NOT require movement for a signal to happen, and it also discerns between ferrous and non-ferrous pretty well. TR mode is a good tool when hunting an area loaded with bottlecaps, to see what is there and if it is worth cleaning the area for the other targets. The problem with the TR circuitry is it lacks depth, and can be erratic under certain circumstances. Knowing this, you can employ it when possible, and it lends that much more flexibility to your efforts.

The TR circuit on Whites Coinmasters is tuned by holding the coil up about waist height and getting a minimal tone from the tuner while holding the reset button/toggle in. Then release the toggle and begin lowering the coil to the ground. As the coil is lowered to the ground, it will invariably go into null sound, no sound. The sooner this happens as the coil is lowered, the more effect the ground is having on the circuit. At about 2-6" above the area of your normal swing, reset the tuners tone with the toggle by clicking or depressing it once, then lower the coil all the way to normal swing height.

This is like tuning it to that particular area of ground, and it will null again as it is lowered the last few inches, and you can work in null easily and to good effect. This can be tested by carrying a nickel around with you and checking the situation at the coil as often as necessary by throwing the nickel down and retrieving it. Once you successfully attain null AND good metal detecting results from your tests with the nickel, and if the discriminate button is set at nails or above, then you can pretty much dig every target because only surface iron and good round non-ferrous targets will set the detector off, for the most part. The trick when operating like this is to go slowly and thoroughly.

There are other tuning and use methods for TR circuitry, especially when working around water, so remember experimentation is your friend. More about that in future entries.

Metal Detecting: The Spherical Field

Coins on edge are a favorite subject among metal detectorists, and that does provide some good subject matter because many coins actually fall into the ground edge first. It was very difficult to find coins on edge with older detectors, and this was because there was very little coin-surface area exposed to the metal detectors field, by which eddie currents could form and thereby cause the opposition necessary to react with the field. Though it could be done by the adepts, and in clean, worked out, but real good areas, this detection mode has been actively sought by some psychos, to squeeze that last coin of super age and make out of the ground. Gold coins are sometimes deep.

With the advent of the phase analyzation circuit in metal detectors came not only good metal discriminating capabilities but also a more distinct and electronically observable spherical electronic field. A 3D effect. This is how I see it anyway. The simultaneous measurement of the phase which is 180 degrees off the primary signal allowed a greater detection capability for coins on edge. Be aware of those musical flutters! The on-edge coins are certainly at all sites, and this is very fun to think about and do.
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Metal Detecting: Be Careful Digging

[ Click here to read more ]
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Some Treasure E-Books at Project Gutenberg

These are fiction books, but older. It should be remembered that many times fable and legend have their roots in truth!

[ Click here to read more ]
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Metal Detector Internet Change

December 13th 2006 17:17


Metal Detectors are highly specialised instruments, and even though manufactured by many different parties, all metal detectors share certain traits and capabilities. Good working knowledge of the general operation of metal detectors is a necessity for success with the machines, and the more experienced a metal detectorist, the greater emphasis is generally put on acquiring information concerning their operations. A lot of metal detectors are purchased, used a few times, then stuck in a closet and forgotten. They may be pulled out occasionally to find someones lost ring, or for a plumbing job, but its well known a lot of detectors never get used, or not much. One of the main reasons for this is the time necessary to learn the operation of the machine. The instruction manuals for most detectors are notoriously scant with their information, and the beginning detectorist is generally put off quite a lot, daunted is the exact term here I think, because the machine is so specialised and makes so many different noises.

[ Click here to read more ]
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Metal Detecting -- Headphones, Speakers, and Better Ways

If you use headphones to operate your detector, apply a piece of plastic tape over the speaker grill on the box, to keep dirt out. It is amazing how much sand and other fine particulate will find its way into the speaker area, over time, and that is not a good thing. A deposit of dirt in the speaker collects moisture, stands a chance of getting into the box proper, and will ruin the interior speaker fast


[ Click here to read more ]
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Metal Detecting Wet

Metal detecting while wading in water poses no end of special problems. Locating the target is the easy part most times, although if the bottom is weedy that too can become a pure hassle. If you happen to find a nice ring on the edge of an underwater weed patch though, which happens quite often, then you too will want to know what is in amongst the aquatic flora covering the bottom. Yes, you will see, you bet.

[ Click here to read more ]
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Sometimes after I dig a target it seems to disappear. This used to happen a lot because I was not too good at discerning between good and bad targets. When the bad target was brought to the surface, the detector would then be able to detect it better and give a null sound, whereas it sounded ok to me when it had a little depth to it. This does not happen too much anymore because I practice a lot.

[ Click here to read more ]
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Metal Detecting History

December 4th 2006 14:39


The metal detector was first discovered by Dr. Gerhard Fisher, a German immigrant, during the late 1920's and early 30's. Dr. Fisher had invented and patented a working aircraft radio direction finder, which even Albert Einstein found intriguing. An adverse property of the patented aircraft direction finder was that it sometimes went awry when a large metallic object, or other conductive situation occurred in the vicinity of the equipment as it was being used.

[ Click here to read more ]
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