Even though you are no longer continuously hearing the all metal hum in one ear, it is waiting there to pounce out at you when your coil passes over a target. If you set the threshold just barely into the silent range, you will still get a sound over just about every target you pass over except a few very weak and deep targets and those extremely small foils and small low conductance jewelry items. Those type signals will be just too weak to climb out of the silent zone into the audible zone.
You will be cutting off just a little bit of the targets front end and rear end sound. You can adjust just a little farther into the silent zone to rule out the sounds of some more of the shallow stuff if you are hunting for something that you are sure is large enough to create a signal strong enough to climb out of the silent zone into the audible zone.
That would be "surface blanking" of some targets and amounts to another form of discrimination. Remember, we are talking only about the threshold of the auto-tuned all metal mode.
It is something to play around with. I sometimes hunt for coins with the threshold just barely adjusted into the silent zone when I'm pretty sure there is not much jewelry around.
Lots of relatively valuable jewelry will only sound off very weakly in the all metal mode and not at all in the discriminate mode that is set to discriminate small iron.
The best threshold setting is just barely a hum, so that you can recognize that tiny little zip sound that some jewelry and lots of foil make. The Nautilus is surprisingly sensitive to tiny low conductance jewelry items. You can determine the shape of a medium to large sized target with the auto-tuned mode by poking around at the target from all directions to sort of outline the target.
Even an 8 penny nail can still be recognized as long in one direction and short in the other with proper coil movement. That is because there is so much more audio information to be gained from listening to the all metal mode. There is some audio info in the Discrimination mode but not much. Nautilus recommends you set the discrimination mode at 9, just short of 10, which is maxxed out.
At this setting, what you get is a very strong discriminate beep without much nuance to it. This beep doesn't start loosing strength on my Nautilus until targets are around the 5 to 6 inch level so it doesn't give us much depth info. On the IIB's you can decrease this sensitivity which will loose you some depth but begin to sound a little more nuanced.
The IIBa has fixed sensitivity settings for both modes, 9 for discrimination and 3 for all metal. The advantage of the IIBa, other than having automated loop balance, may be these two fixed sensitivity settings.
You cant change them so they will always provide the same signal comparisons. There is something to be said for consistency and working from fixed reference points. On the other hand, the IIB's adjustable sensitivity settings give more versatility which allows different settings for adapting to different site and hunting conditions. Discrimination on the Nautilus Dual Mode system depends on the instantaneous comparison of the discrimination mode and the all metal mode.
For full effect, set discrimination to discriminate only small iron and then compare the two modes. If you set the earphones to MONO, you get the tone-on-tone effect like mixed mode on a few other detectors The discriminate signal simply tells you one thing: you are passing over a target that you have not discriminated out.
Robert Sickler, who wrote "Detectorist", a great reference book about metal detecting, describes the Nautilus method of audio discrimination; "If the all-metal signal is heard long before and louder than the motion signal, the target will likely be large and ferrous in content. If the all metal audio signals shortly before the motion signal with about the same strength, the target will likely be brass or lead. When both signals sound nearly in unison, the target will be higher in conductivity and more likely a coin.
Should the all-metal signal be greatly weaker in comparison to the discriminate audio, the coin could be very deep and made of silver. Changing your sensitivity settings will alter your audio sounds.
At the Nautilus recommended settings, the discrimination mode will go deeper than the all metal mode. The all metal mode at this lower setting will give you more descriptive audio information about targets. Increasing all metal sensitivity will alter target audio from that mode.
Targets can not only sound louder but also broader than they do at the recommended setting of 3. That appears to be the reason that the IIBa has a fixed sensitivity of 3. At some sites, using the IIB, I experiment by lowering my all metal sensitivity to as low as 2. The ground balanced all metal mode has less sensitivity to the more conductive targets such as coins and silver jewelry. Less sensitivity simply means it wont hit as hard on these type targets or read them as deep.
These type targets hit softer in the all metal mode and also signal mostly in the very center of the coil with very little "width" of signal. The compact, symmetrical and consistent shape of these type targets seem to also influence the narrow sounding hit. An oddball shaped high conductance target may hit softly but sound wider. So if you get the discriminate beep accompanied by a fairly soft sounding narrow all metal hit, you have a higher conductance target of approximately the same size as a coin.
A common way of saying this is that both modes tend to hit at the same time. Something like a dime at a little depth will hit so narrow and softly on the all metal side that the discriminate signal will strongly dominate. Quarters hit softly but being larger, have a wider hit than the dime but can be recognized by the softer hit which fades rapidly as you raise your coil and re-sweep.
With a little practice you will quickly learn to recognize these type targets. You can emphasize the softness of the weaker hits by lowering all metal sensitivity from 3 to about 2. The sound of the more conductive targets, being weak to begin with, will weaken rapidly as you raise your coil and re-sweep them. If you get a good sounding signal at ground level, get a second opinion by raising the coil about 6 inches and re-sweep.
You get bonus points for doing this as raising the coil often improves discrimination and pinpointing. Targets with mid-level conductivity hit a little harder and wider. As you pass over a pull tab, you will hear the all metal tone coming on before the discrimination hits. A penny and a pull tab are very close in conductance and sound similar but the penny will fade faster as you make a higher coil pass. The ring of a pull tab with the beaver tail broken off is just a little bit more conductive than the complete pull tab and is even harder to tell from the penny.
The narrow "width" of the more compact coin hits help distinguish them from wider sounding aluminum trash targets, especially with the raised coil pass. The operating frequency of the Nautilus is such that it hits hard on targets in approximately the same conductance range as nickels. The same trash target, like the beaver tails broken off of a ring tab, that fooled your metered ID machine, may fool you and the Nautilus also. Breaks of the game.
Good solid hits in both modes that are distinct enough to alert you to something in this range has to be dug because of the rings and other desirable targets that fall in this conductance range. Nickels tend to fade a little faster than some trash targets with the raised coil pass and give a more compact sounding hit. Jewelry items, depending on size and conductance can vary some in width of signal but tend to fade fast on the raised coil test.
If you have iron discriminated out, some very small jewelry items can be heard as a weak kind of "zip" sound, only in all metal. So does some small pieces of foil but if you are hunting a site where you expect to find jewelry, check out the zip sounds. Iron reads widest of all, usually wider than the coil. You can start getting an iron signal before the leading edge of the coil reaches it and the signal can hang on for a short distance after the coil passes over it.
Hunting with the auto-tune turned off allows you to "feel" and "poke" around a target to determine its characteristics. An 8 inch coil can give you a 10 inch wide signal over iron. An honest iron signal is easy to recognize. Unfortunately, all iron is not honest and it can give off erratic signals ranging from iron to coin. Steel bottle caps are really bad about this because of their similar size and shape to coin type objects which allows them to simulate some coin characteristics such as sometimes having a tighter more narrow sounding hit than iron on your first coil pass.
Still, you will usually hear something in the signal to raise your suspicions and cause you to make the two standard tests for rusty iron stuff. First, double check the width of the target to verify a wide signal and next, make a short fast coil sweep right exactly over the center of the target to see if the discrimination signal deteriorates or goes away completely which indicates rusty iron.
If your discrimination signal sounds better as you make the fast coil sweep, it may indicate something a little more conductive than rusty iron or steel bottle caps.
Not always, but it pays to gamble and dig. Bottle caps made by different manufacturers have different combinations of metals in them and some can be hard to distinguish from a coin. In my area, Shiner Bock Beer bottle caps indicate nickel on two different meter and tone ID machines.
Sounds like a nickel on my Nautilus too. And make a short fast pass over those suckers with a Quantum XT and they read high coin every time and show just one or two pips on the smear graph.
It is hard to accurately talk about the sounds targets make on the Nautilus with the written word but the Nautilus has an outstanding language of its own that you will learn to speak. With the right operator technique you can coax it to tell you some secrets. What does a good target sound like? As one old timer said, "You will know it when you hear it.
Solid compact items have a more definite solid sound and tend to give a more narrow signal. Rings provide an ideal directed circuit path for current to flow and create a good signal.
Irregular shaped items like ring tabs tend to give a more scattered, or wider, signal. Square tabs however, being compact and about coin size and made of only one metal, give a good sounding coin type signal but they don't fade out as fast as you raise your coil like a more conductive coin does. On the Whites machines with signagraphs, a sort of graph was presented of a targets audio characteristics. It is a great tool but with the Nautilus you have the same ability while concentrating with only one of your five senses, your hearing..
Compact targets such as coins or rings only raised one or two pips on the graph. On the Nautilus, you hear that as a narrow hit. Your indication is just as accurate as the graph. Iron on the signagraph was represented as a wide "smear", raising many pips across the conductivity range.
On the Nautilus, you hear that wide sounding smear for iron. On the signagraph, a target pip was shown on a referenced background of a conductivity scale. On the Nautilus, the simultaneous discriminate and all metal sounds tell you basically the same thing. On the Nautilus, you have both modes in stereo working at the same time to poke around at the target and get some more target info. The electronics of some metered type machines are so strongly biased against trash that they tend to ignore doubtful targets.
With the Nautilus, you should dig more of those doubtful targets, dig a little more trash but get some more goodies. The Nautilus system invites you to gamble and take a chance. Preset meter ID systems are designed to keep their operators happy by a strong bias against doubtful targets so they dig less trash. You will often be able to find stuff a metered machine and less experienced operator passes over.
Many targets have more than one metal in them. Gold rings are not pure gold but mixed with silver, copper, etc. The less conductive the mixture of metals, the "wider" the targets sound but the fade rate over rings is faster than most trash items and you can learn to recognize them. Your detector tends to "average" out the conductivity of what it sees under its coil. A quarter and a pull tab laying within an inch of one another at the same depth often reads zinc penny, an average between the metals.
If we are not digging those annoying zinc pennies, we are now minus a quarter. A quarter and a nickel are both good coins that we would like to have but if they are closely co-located, they can read ring tab or square tab. If we are hunting with high discrimination with tabs discriminated out, we would have lost 30 cents.
Now we are 55 cents in the hole. The Nautilus tends to average closely co-located items too but the result usually doesn't sound exactly like what either of the two targets would sound like by themselves. In my experience, the more conductive item will dominate. All the more reason to dig those targets that you cannot definitely define as bad by their audio sound. Thats is how I got the big silver ring that was snuggled tightly to a rusty bottle cap. And this in an area that I know I had been over numerous times with about 4 different detectors.
Even the Nautilus discrimination mode didn't make a good enough dig signal over that target but in all metal it didn't read as wide as iron and it faded out almost as fast as a coin when I raised the coil.
I can only attribute that to the Nautilus "averaging" the two targets and giving me a hint that something wasn't quite right. Ring tabs can consist of four different metals. There is the ring of one particular aluminum alloy.
The beaver tail tab seems to be of a much stronger metal, possibly more like tin or steel. Then there is the rivet that holds the two parts together.
And last but not least, the inside of the beaver tail is coated with something which is probably metallic in nature. Add in the fact that different manufacturers may be using different metals. This mixture of metals cause's a little bit of a smearing sound, wider and louder than a coin hit and it will not fade out as fast as a coin or most jewelry items with a raised coil pass.
Coins fade out fast compared to a complete pull tab which continues to sound off wider and stronger from a greater hight. The beaver tail separately reads just like a nickel on the vast majority of detectors, including the Nautilus. The ring part of the tab separately reads higher conductance than a complete ring tab and sounds very similar to a penny.
Lots of idiots got nothing better to do than sit around breaking the beaver tails off of the rings and throwing them around. With practice, you will feel confident in recognizing most complete pull tabs but once the two parts are separated, you may often get fooled into digging the ring as a penny and the beaver tail as a nickel. I still dig every thing I'm not sure of and thats how I got the 14 Karat braided gold ring. Grumbling and mumbling, absolutely convinced I was digging another ring part of a pull tab.
Best looking pull tab I have found lately. Adjusting the all metal sensitivity upward changes the audio characteristics of the targets, making them sound louder and also wider.
The electromagnetic field around your coil not only gets deeper, it also gets wider, picking up some irritating noise from fringe targets off to the side of your coil.
For coin or jewelry hunting under average conditions, I don't recommend any all metal settings above 3. With the discrimination sensitivity at 9, it will be providing good depth while the all metal mode at 3 or even less, will provide the quality of audio you need to help you identify targets.
On the IIBa, those settings are fixed so you have no choice. On the IIB at very trashy sites, I often turn discrimination sensitivity down to about 6 and the all metal sensitivity as low as 2. The IIB allows you to adapt both modes sensitivities to a sites hunting conditions.
If you try to overpower a site with sensitivity too high you do more harm than good. For coins and jewelry, you wont to adjust for cleaner sounding and more accurate discrimination.
You still get very good depth at these settings and can more cleanly pick the good targets from the trash. If the amount of trash is not just overpowering, discrimination should be set between 15 and 20, just enough discrimination to eliminate audio over nails and small iron. You will have to listen to a lot of discriminate and all metal signals but lower discrimination combined with audio discrimination is very effective in picking the good stuff out of the trash targets and iron.
At this low discrimination setting, small iron and the ground are the only things masking targets and have a minimal effect. Everything below your discrimination setting has a negative effect on everything above it. The less you discriminate, the better your chance of getting good clean signals on all targets that you are not discriminating.
If you adjust the discrimination up past square tabs to where you get a signal only from coins you have added foil, bottle caps, nickels, ring tabs and square tabs as discriminated items, just to mention a few.
With that high discrimination setting, you have declared that everything in the ground is trash except coins and a few other high conductance items. The nickel doesn't like being called trash and it can retaliate against you for treating it so rudely. You may think you are getting all the good coins now but if you lay a nickel beside a quarter and check for signal, you wont get a discrimination tone.
The nickels influence on the quarter causes your detector to average the two items out to somewhere in the pull tab range. NV Manuals. Nautilus Monitor Be Strong. NV Assembly manual 18 pages. Nautilus Other Ec Assembly manual 38 pages. Nautilus NT Manuals. Nautilus Other NT Assembly manual 2 pages. Nautilus Other NT Assembly manual 8 pages. Nautilus MXE Manuals. Nautilus Scrubber MX Operating manual 54 pages.
Nautilus MXH Manuals. Nautilus Art Nautilus Tablet Art Nautilus DigAlert Manuals. The DMC2B will never be made or copy by other company's for reason which I know will not disclose here in detail. All Nautilus are hand made and each unit is set super high standards are made best parts and tuned.
The Nautilus's coils are still today the only hand made coil and also designed be adjusted set to handle and adjusted there Un-Match Transit Power then any VLF and even some P. Most Nautilus users and "old school' long time relic hunters that dug tons relics with them. You will not see Nautilus users posting there finds or Y-tube to boost there ego's.
Well said relicstevemd. A lot of Youtube Glory Hounds nowadays. They don't realise they are cutting there own throat just to Be the internet King. Edited 5 time s. Some big EGO folks say very bad opinions about that unit. But never used it. They say - antic machine Wayne Lee owns the company now He made it sound like he wanted to open the company back up and sell them.
He was a friend to Tyndall and got ownership by buying his portion. Then when the other owner died a few years back he owned it all and was given a basement full of machines and parts from his widow. Dew Reply Quote. I'm keeping both fingers crossed for Wayne!
I hope he start with it again. Keith Southern. Very good deep unit Good unmasking but not great unmasking.. Always had a silver sabre set aside for the iron even back then.. Right Keith. Here in Europe is kind of Holly Grail in metal detecting world. Nobody see it but many hear something about it. Some peoples are shocked, but this is nothing special.
Modern version should have faster recovery speed. I would think lower disc accept would help alot What I do is shut off all metal channel in heavy iron and turn disc real low..
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