martedì 7 febbraio 2012

Minelab Quattro

Grazie ai quattro modi di ricerca (coin, coin/jewerly, relic e all metal) questo nuovo metaldetector prodotto dalla Minelab è ideale per qualunque tipo di ricerca.
La tecnologia Full Band Spectrum permette di trasmettere su più frequenze, in un range compreso tra 1,5 Khz e 100 Khz. Quattro è dotato di pinpint (utile per poter accentrare in maniera molto precisa l'oggetto) e del comando noise cancel (utilissimo per poter bilanciare il metaldetector su qualunque tipo di superficie e per qualunque tipo di ricerca).
Minelab Quattro è un metaldetector particolarmente indicato per tutti coloro che necessitano di uno strumento con ottime prestazioni e di un ampio display digitale che fornisce indicazioni precise sulla natura dell'oggetto rilevato.

Utilizzo consigliato

Minelab Quattro è particolarmente indicato per ricerche su terreni agricoli, arati, sabbia asciutta e terreni ad alta mineralizzazione. Quattro è molto valido per la ricerca di monete e di piccoli oggetti.

Caratteristiche principali
· Ricerca di tipo motion con pinpoint non motion.
· Quattro modi di ricerca selezionabili.
· Piastra di ricerca da 10,5" con salva piastra.
· Pacco batterie alkaline.


In The Field

Quattro FindsIn areas with trash, I learned early on that the Quattro requires an unusual style of hunting. The user will not go flying across a field in a hurry. The Quattro style is a slower, methodical type of detecting while investigating signals. Doing so allows the Quattro time to identify some deep targets. Once a good signal is isolated, the Quattro grabs onto it like a pit bull. I was impressed with the accuracy of Target ID even to the edge of depth. However, the other side of this ability is the necessity for slow coil speed.
Using the Quattro in heavier trash, one must search very slowly. In a junky park, the Quattro is evaluating a lot of information from its multi frequency operations. Moving the coil in trash terrain can hold the ID of the first target to the second.This is due to a very slow recovery speed as the coils moves from Target to target. Again, slow is the key word. By experimenting, I discovered a method of hunting with the Quattro to enjoy accurate target ID at good depths, while dealing with the recovery speed. Incidentally, although one was not available for this test, I believe that a smaller coil could do wonders for further separating closely spaced targets.
Bernie did not mention the slow recovery in reporting on his beach hunts, but his comments indicate that he did exceptionally well on the saltwater sands. He also said he had not noticed any carryover signals. Knowing Bernie to be a very experienced Minelab user and a master beach hunter, I deduced that his must be due to most beaches having significantly less trash than inland parks. Therefore, the Quattro's threshold would have time to rest before the next target. Some quick tests of my own later proved this to be the case yet it is not mentioned in the manual. The Quattro operates differently, and I only discovered these things through trial and error. A new user, perhaps with minimal metal detector experience, should not have to go into the field without first having the Quattro's process of operations fully explained to him.
Forget the way you used to detect, if you have not hunted with this technology. If found it helpful to use High Trash Density and hunt in Relic or All Metal mode while listening for the high tones. Some may want to toggle back and forth between Conductive and Ferrous modes. Ordinarily, when a target sounds good you would re-sweep the spot to see if you heard it right. However, with the Quattro, it's best to raise the coil for a moment to allow the circuitry to reset itself. Just a couple of inches off the target will do. Then return it to earth and re-sweep with a couple of short back-and-forth motions, to see if the signal is still good. If so, then the target probably will be a good one. However, if the signal changes to some junk reading like iron, then it may indeed be junk. Watch for the opportunity to isolate a higher signal that could be a good target near iron. I could not help wondering if a return button might be of use in such situations, as in the old days.
Often when making that second ID, I would would hit the pinpoint button to ascertain quickly the exact locations of the target. Centering over the target provides the most accurate information. Keeping your eye on the pinpointed spot, raise the coil and hit pinpoint again to go back to the motion mode. A re-sweep of just a couple of short, back-and-forth motions will proved the best ID. Although it requires a slower style of hunting (which some do anyway), this method of separating the targets provides the most accurate visual and audio target ID, Regardless of depth.
When using the Coins, Coins & Jewelry, and even the Relic mode, you will hear a nulling of the audio when a target is rejected. If there is excessive nulling, there may be many iron nails present. Whit machines possessing a quicker response time, that is not as big a problem. With the Quattro, I preferred to hunt in All Metal mode with a very slow sweep, in order to hear the low tones of ion and just ignore them. After getting a signal in trashy areas, I often performed that little coil tip-up to reset. When targets were close, the audio ID changed more quickly than the retained visual ID. Employing the High Density Trash selection makes a real difference in recovery time. Reserve Low for cleaner areas such as woods and beaches.
Quattro in the FieldAlthough the manual says there is some loss of depth going from Low to High Density, it can't be much. For example, hunting in All Metal mode with a High Density setting, I heard low-toned signals and saw -6 and -10 with a higher tone +37 ID in the middle. Some quick little back=and=forth motions while circling and changing my angle of attack, had the +37 hanging in there tough. It was even possible to pinpoint it narrowly, right between two iron targets. Once, the depth was saying 10", and indeed it turned out to be a 1964 silver dime at about 10" next to iron. Lessons learned here were to listen to the tones before looking at the meter, and to use a very slow sweep to reach deep.
Another hunt was just a quick stop at a playground with several inches of wood chips. I had cleaned this area off before and did not thing there was anything deep, yet at a high tone +37 at 8" turned out to be a clad dime in mineralized soil beneath the wood chips. On one trip, I was accompanied by a friend who was using a difference brand of detector. The Quattro picked up a dime at 8" with manual sensitivity at #18 in rather difficult soil. Checking the signal before digging, my friend could not get a peep.
At a different park in difficult soil and plenty of ron nails, I had been hunting in Relic mode and High Trash Density with Auto Sensitivity. A +38 high tone was repeatable, and the depth read 6". When I pinpointed, it was showing a wider area than a coin, so I thought it might be an aluminum can. The target ended up being three separate, broken pieces of 1950s toy gun at 8". Once again, I was impressed by this DD coil's ability to outline the target accurate when the coil is moved very slowly.
Oh, wait a minute... I promised to tell you what was fond at the beginning of this article, didn't I? You may guessed it was a gold ring, a lady's think band with a gold pod on top holding a stone. (No, not a diamond, unfortunately.) The point is, by very slow seeping, recovering the threshold, and isolating the target, the Quattro came up with a deep, good target near small iron. It was slow work but a good find nonetheless.

Bernie's Beach Tests

more quattro findsBernie used the Quattro on a variety of saltwater beaches in Southern New Jersey and repots stable operation in all sand situations. Pinpointing was stable as well. He liked the Coins & Jewelry mode for its lower discrimination patter, but also the Relic and All Metal Modes for their ferrous tones. Bernie felt he lost depth on beaches with the Auto Sensitivity, and found that a manual setting of #18 was best, as #19 and #20 often caused falsing. The Target ID of coins showed an overlap of numbers with an averaging type system. Targets read in a number range rather than on specific numbers. For example, quarters and dimes read in a range of 36 to 38, rather than 36 for dimes and 38 for quarters.
The maximum depth achieved on any target was about 11". The Quattro was very sensitivity to small gold as well as large gold items, which is what most beach hunters need. Having an All Metal mode with tone ID is a real plus, notes Bernie. It rejected iron extremely well while still detecting good targets above it. Overall, the Quattro's simplified operation made it easy to use on the beach, and it worked well on wet-salt sand. As you can see from the accompanying photos, Bernie cleaned up on the beaches and his finds included a nice gold ring.

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