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Monte said:actually a measured 6½" diameter, as it is an excellent general purpose coil. I have used that measure coil on both the 6.59 kHz models and the 'V' series models [size=small](mainly the MXT series)[/size] at least 90% of the time. Probably more like 95%, and they provide very versatile performance.
Monte
However, in the end, most of us think in terms of a coil's physical size and shape. That makes it easier to know if it will 'fit' into a tight space, or make it easy to compare with a competitor's coil by actual physical measurement.PSS1963 said:I was thinking about this, Monte, and while the outside plastic casing may measure 6.5 inches (I haven't measured it but I'll take your word on it) I have a hunch that the Tx coil inside may be what actually measures 5.3 inches. That would be a good rationale for the name and certainly the excess plastic that brings the outside diameter up to 6.5 wouldn't contribute anything to the performance.
-pete
Monte said:However, in the end, most of us think in terms of a coil's physical size and shape. That makes it easier to know if it will 'fit' into a tight space, or make it easy to compare with a competitor's coil by actual physical measurement.PSS1963 said:I was thinking about this, Monte, and while the outside plastic casing may measure 6.5 inches (I haven't measured it but I'll take your word on it) I have a hunch that the Tx coil inside may be what actually measures 5.3 inches. That would be a good rationale for the name and certainly the excess plastic that brings the outside diameter up to 6.5 wouldn't contribute anything to the performance.
-pete
Going back a couple of decades White's marketing guys, I would presume, came up with a 7.8 title for the 8" coil on the Quantum II. They took the Blue Max 600 [size=small](which measured 6½")[/size] and changed the color from white to black plastic, and renamed it the 5.3 Black Max. Later it was again renamed the 5.3 BullsEye, and the same size coil for the MXT and DFX was labeled the 5.3 Eclipse.
Yes, the "5.3" is a measurement of the inner Transmit coil winding. But twice I asked a White's engineer about the coil's actual measurement and neither time did they have a knowledgeable answer. I asked if the new marketing name for the decal referred to the Transmit winding and they said yes. Then I asked if that was a measurement from the inside or the Tx coil across to the opposite inside of the winding? Or, was it a measurement from the outside of the winding straight across to the opposite outside of the winding? To keep them on their toes, I asked if the '5.3' was a measurement from the center of the coil winding straight across to the center of the opposite side of the winding?
A simple question related to physical search coil size brought about this stymie because two engineers didn't have the true answer to the questions of just what was the actual measurement. Then you can look at other search coils from White's as well as coils from other manufacturers and, low and behold, many do not have a 'proper' or 'exact' physical measurement.
Take the 9" Spider Eclipse coil they now have for the MXT's and other upper-end models. They call that a 9" coil for their Prizm/Coinmaster series as well. It measured slightly over that, and I don't have a ruler handy but I believe it's about 9¼". Well, they just announced the new, lower frequency Treasure Master and Treasure Pro models with a 10" DD coil ... and ... a 9½" spider Concentric coil.
I kind of doubt they molded a brand new 9" spider coil that was larger than the slightly over 9" spider they had that actually measures 9½". Furthermore, the so-called 5.3 coils used the same plastic housing as the Blue Max 600 coil, and that's one they called 6" when it actually measures about 6½". Many of the competitors have also had coils that were labeled different from what they measured, but in the end most manufacturers, for the decades they have been making hobby-end detectors, have generally tried to describe them based upon their actual physical measurement.
I like that because you can then read and compare then with the competition. Besides, the nifty marketing concept to call a 6½" diameter measured coil a "5.3" was kind of a back-fire. I almost always make it a point to call that coil by its physical size rather than, or in addition to, 5.3 because for almost a couple of decades now I know many people who did not buy that excellent size coil because they thought it was actually [size=small](physically)[/size] barely over 5" and too small to be useful for them.
Monte
plidn1 said:I am a very successful jewelry hunter.
My choice of weapons are the MXT and M6.
When you get some experience under your belt, you will find out most jewelry is found in the 3" to 5" range with an occasional 6 to 7" target.
The coil I use 99% of the time is the 5.3.
Not only is it superior to DD coils in pinpointing, depth, and IDing, it is light weight and covers a good mount of ground. As far as depth, In my mild ground, I have found a silver ring at 11".
That was a rarity, but shows you how affective it can be. In the extreme trashy areas, I use a detech 4.5" round DD. It will pinpoint like a rifle shot, separate next to none, and give you moderate (6-7") depth.
I have other coils I use for different tasks but the coil of choice is the 5.3.