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IMO, something that will rarely if ever is seen, would be a double-blind detector test (neither the tester or testee knows what/where the target is) performed on in-place test-bed targets with various people testing the same model detector they pretend to know and let them adjust it as much as they like to try and acquire the target. That's a real contest. I don't care that different so
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I"ve detected in Washington parks, schools, trails, state parks, public roadways, swim areas, campgrounds, and fairgrounds . . . but you have to check the individual regulations (search online). Some parks allow detecting but no digging (which is ridiculous), others prohibit detecting outright, and others say no plants can be damaged (which assumes no digging as the grass is being "dama
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I've heard that ultrasonic subterranean imaging can identify targets down to about 0.20 inches in size using ~300kHz frequency, losing target resolution to about 12" at ~8kHz. So, perhaps someday. But for now the cost, weight, power needs, and I think the technical difficulty of locating and identifying targets using sound makes such a device impractical for hobby use.
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Quick question ... which detector would you choose for salt beaches, the Multi Kruzer or the Anfibio Multi? Or are they equally effective in iron, trash, salt mixed with minerals, and target separation?
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Could it be that any detector at any cost could find a silver coin assuming it is not too deep? Same for gold coins. And copper. Less about the detector itself than the fortune of putting the coil over the target.
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
The question of LRLs may seem fantastic ... finding buried treasure in the ground which might be improbable. But, I know a man who lived up in the mountains, he told a story which is improbable but true. He was out hunting one day and randomly took a shot at some game running past, and to his surprise, the shot missed the animal but opened a tiny hole in the ground. Not unlike LRLs finding gold i
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I start early on the dry sand along the towel-line before people arrive. Then move to the wet sand (typically hunting near low tide). Then as the people fill up the beach and it gets hotter - out in the water for the next few hours.
So, the amount of junk targets is the most at first when I'm freshest and willing to sift it out, then targets become fewer in the wet sand (and the ground i
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I'm okay with the Makro pinpointer, though the top buttons are awkward and I continually forget its multiple functions. I liked the Minelab Pro-Find better as the controls are easily acquired, but it tended to pick up EMI and starts motor-boating making it useless. It also reacted to saltwater in the pouch in the water making it bothersome. The Marko is quiet in the water, doesn't react
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
The solution to comparison videos that cause so much angst is not censorship or limiting the freedom of others, it is more comparison videos, many, many more. That is always the right answer to any speech issue; if free speech doesn't protect unwelcome speech then what does it protect?.
I appreciate these videos and encourage more, not less. Where else is anyone going to find something ap
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
The IP68 standard allows the max underwater depth to be more than 1 meter; the manufacturer determines the maximum allowable depth.
Makro max depth for the Anfibio is16.4 ft (5 meters) with 2yr warranty
Minelab max depth for the Equinox is 10.0ft (3 meters) with 3yr warranty
Minelab max depth for the CTX-3030 is 10.0ft (3 meters) with 3yr warranty
Garrett max depth for the A/T Max is 10.0
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
A detector that air tests at 7" on a dime but finds a dime 12" in the ground would be highly suspect of having been air tested with restrictive EMI present. EMI is probably the culprit responsible for making people think their detector goes deeper into the ground (where they are detecting in the open away from EMI) than in the air (near their house). There might be a case for vertically
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Tom, typically noise canceling is performed with the coil in a horizontal plane but air testing is done typically with the coil in a vertical plane ... does polarized 'noise' introduce variations that skew or invalidate the air test (since most VLF noise is potentially vertically polarized) for determining the depth when the detecting will actually be in a horizontal plane? Just wonderi
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Sound interesting ... but can it differentiate a pull-tab from a nickel? A thin ring from foil? Can it ignore the high chirps formed on the sharp edges of a bed of randomly orientated elongated iron? Does it respond to variable salt conditions (ocean waves)? Would it ID a bottle cap as ferrous or non-ferrous or both? What are the unit's main weaknesses, every detector has some?
John
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
You want to find micro-jewelry that is diamagnetic (-X), is not ferromagnetic (+X), has a short resistive (R) low-conductive time-constant only slightly longer than conductive sea water (1uS) which it competes with, has varying resistance and inductance due to micro-jewelry's size, shape, alloy, orientation in the ground. How hard can that be?
Don't know for sure but I'd think t
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Sure ML is out in their corporate backyard testing the Equinox and scratching their heads too. That is a significant problem to have uncovered. My first impression is that this effect (coin on edge) is due to the configuration of the Eq coil over the CTX coil. I'd surmise that the Eq coil has a tighter magnetic field signature, meaning that the field lines are more vertical (like a knife) wh
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Some ring FBS readings ...
There are some apparent TID groups that cluster based on metal purity and/or thickness but there is also a great deal of variability. A quick check of Fe/CO numbers shows some TID zones that are likely to be rings (or silver coins) but most rings are right in with coins and most non-ferrous junk metal. It's always a pleasant surprise when that foil wrapper sign
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Some years back I did a nailboard test with the CTX (and E-Trac) that showed how sensitive the FBS machines are to elongated iron (using a penny). Granted it was a 2-D test, but the 3-D test should be no surprise.
I produced a bunch of graphs from the study, but the upshot was if the nail is parallel (north-south) to the sweep the Co value remained stable no matter the nail-coin distance but
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I wouldn't object to detecting national parks, national monuments, and national battlegrounds if the relics were placed in a national museum for everyone to view. If "we the people" own the national sites then "we the people" should be able to see them (rather than being sold for profit). If the government had wisdom it would allow detecting with the caveat that relics mu
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Realize that this is conjecture, but based on what little info ML provides it does appear to me that the signal in Low Trash is processed so that the highest amplitude non-ferrous signal passes the gate within some increased length of time. That is, if the goal is to avoid multiple weaker non-ferrous hits. However, the detector I believe doesn't 'see' the ground longer, which is de
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Hi Steve,
I think you have described the High and Low Trash separation settings correctly. My guesswork follows: the assumption is that in non-ferrous trashy areas the user will opt for more discrimination to eliminate the trash. But the more disc used the less sensitivity overall and weaker non-ferrous objects (coins) would may not register at all when using aggressive discrimination, especia
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
the "Toughest" learning curve before you mastered it
I'd suspect, subject to correction, but the more possible adjustments a detector has, the less you actually know.
Suppose you have 10 switches (LCD controls if digital) that can be either on or off. Only choice is on of off. You only want to change 3 of the controls at a time picking from among the 10 total controls. You a
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I don't think I think when thinking about digging or not. There are characteristics to the detector's signal, audio or visual, but am I really analyzing it? Probably, yes, but subconsciously. It's like driving to work in the morning. I get there by really don't remember the drive. I'm sure people can relate. After detecting a bit there is a zen quality of otherness, you j
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
...dug a 7' x 10' x 22" deep pit.
Tom, the pit would have a volume of 128.3 cubic feet.
Assuming the 5"DD coil could recover 100% of non-ferrous targets in the pit to a depth of 10", the coil illuminates a total of 58.3 cubic feet of soil or 45.4% of the pit.
That leaves about 55% of the pit soil unsearched by the coil.
Assuming a homogeneous distribution
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
I was hunting black bear in N. California, when I thought to take a quick 5-min nap on a log. It was a few hours from sundown, but when I awoke it was pitch black out. Deep in the woods, with no moon, on a trail used heavily by bear and I couldn't see ten feet in front of me. I started out okay, but in a few moments I felt like there was something following me, and it wasn't human. I wo
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
How widely were gold coins dispersed in the US?
We can take a guess ... we know the mintage totals for gold coins. Now we just need to make a series of assumptions, any of which are not likely to be accurate.
We'll assume some things:
With the recall of gold coins older than 1834 (the value of the coin exceeded the face value, the mint recalled gold coins melting down coins olde
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
Darwin isn't my favorite, a naturalist with a vivid imagination but when push came to shove unmoored from science (e.g., human evolution and macro-evolution, two principle failures).
However, Darwin was on to something with earthworms (his initial findings were mostly rejected by scientists). His experiments with sink rates gave him a rate of about 0.60 cm per year (0.24"/yr) on smal
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum
So many factors involved. The higher op freq of the Deus at 18Khz would produce current flow in the coin that is shallower (surface) than say the CTX (very low primary op freq). It could be that the surface flow encounters a rougher pitted coin outer layer or the raised relief of the coin is more aggressive, which slightly lowers the conductive report.
The CTX would, in theory, drive current
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Johnnyanglo
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Thomas Dankowski Metal Detecting Forum