So, how do we distinguish a high pitch sound that hits "somewhere" in conductive zone 31. One way is with a Ferrous "marker" in which we look at the horizontal axis for an indication of how much ferrous content the target has. Another is to go by the duration of the sound or telling one middle C from another would be the duration of the sound. Let me say this very quickly.......this takes a lot of hours on the detector to include pitch duration with how fast we are sweeping the coil. A second problem is the skewing of the targets. If we use learn edit we will see that the same target can hit at different points on the screen simply because of how we sweep the coil. This is why we need a nice consistent sweep and need to center the target for a really good reading. This is a very good reason to always pinpoint a target then take a good reading to see what caused the hit.
A good example of duration is the difference between iron and non-ferrous metals. iron will generate a sound far outside of the diameter of the coil. This is not true of the tiny bits of iron but say something the size of a quarter. Non-ferrous metals will often only generate a sound, when in the soil, if they are under the coil. The old timers or experts use the sound width or length of sound in addition to the pitch. Now add sweeping the coil from different angles and we end up with a pretty good idea of what to investigate further and dig or let pass it up.
My personal preference is to go by sound pitch using Ferrous sounds as this follows the ferrous/non-ferrous content and that is what I am interested in. I then use the Digital Readings for Ferrous/Conductive. I taught digital electronics so am comfortable with digital numbers and have a mental picture of how the display is laid out in digital numbers. Sounds also become very easy to relate to a digital reading so a dime is easy to recognize.
We can then add ferrous targets next to non-ferrous ones. We now mix low and high tones but the saving grace is that a piece of iron next to a silver dime will have a sound "tune" and digital reading that we come to recognize as co-located targets. This is one reason for using IM-15, IM-14, something in that area, as targets co-located will generate sounds we recognize. There actually does come a point where we say "That is a dime next to a piece of iron" and every once in a while we are right.
However, unless all you have to do is play around with the detector it might be best to use a visual indication, the screens, with the tones as it may take a while to get to the point Bill has achieved with sounds.
Does this sound correct to you Bill? Please understand I have a lot of respect for your skills from reading your post over the last couple of years so ask this question in earnest.
A good example of duration is the difference between iron and non-ferrous metals. iron will generate a sound far outside of the diameter of the coil. This is not true of the tiny bits of iron but say something the size of a quarter. Non-ferrous metals will often only generate a sound, when in the soil, if they are under the coil. The old timers or experts use the sound width or length of sound in addition to the pitch. Now add sweeping the coil from different angles and we end up with a pretty good idea of what to investigate further and dig or let pass it up.
My personal preference is to go by sound pitch using Ferrous sounds as this follows the ferrous/non-ferrous content and that is what I am interested in. I then use the Digital Readings for Ferrous/Conductive. I taught digital electronics so am comfortable with digital numbers and have a mental picture of how the display is laid out in digital numbers. Sounds also become very easy to relate to a digital reading so a dime is easy to recognize.
We can then add ferrous targets next to non-ferrous ones. We now mix low and high tones but the saving grace is that a piece of iron next to a silver dime will have a sound "tune" and digital reading that we come to recognize as co-located targets. This is one reason for using IM-15, IM-14, something in that area, as targets co-located will generate sounds we recognize. There actually does come a point where we say "That is a dime next to a piece of iron" and every once in a while we are right.
However, unless all you have to do is play around with the detector it might be best to use a visual indication, the screens, with the tones as it may take a while to get to the point Bill has achieved with sounds.
Does this sound correct to you Bill? Please understand I have a lot of respect for your skills from reading your post over the last couple of years so ask this question in earnest.