Your observation are well taken and I agree and try to caution about discrimination as some target are going to be missed. If a ring hits at the same digital readings as pulltab set for rejection then we are going to miss both unless there is a way to tell the difference. This is what I have been trying to do with the heavy trash program and is the heart of the problem. We have to make some kind bet if we use discrimination such as how many gold coins have I found and are there likely to be found in the area I am going to search compared to the number of silver coins and other good targets I can recover with a good discrimination program. Unless we use all metal and dig it all we always take a chance. You have mentioned the ultra deep targets that give a low tone at 10 to 12". There is no question as far as I am concerned that many of those are good deep coins. I have found two 1916D dimes and they are worth a lot. What if some of those deep low tones are for those kinds of coins or even a gold coin which is heavy and will sink better than light trash. Gold can be missed at depth as we know. So, do we dig all those deep low tones? If they give us discrimination that is linear at depth, complete detection depth of the detector, and the depth is 12" or more there are going to be a lot of happy guys out there buying that machine.
However, for now give this a try. Select the factory preset Coins program and sweep over a pulltab. We get a nice clean hit with an ICON that indicates a Coin/Jewelry. Go back to the menu and Select a pulltab to be accepted. Nothing changes on the screen since the Coins preset will also detect pulltabs. Now sweep over the pulltab and now we see the ICON has changed to indicate a pulltab. Now go to Learn and reject the pulltab with the smallest cursor. Again sweep over the pulltab and we start to hear a sound for the tab and then it is rejected and there is a null. But we see an ICON for a pulltab.
A ring will give a nice clean hit while a pulltab breaks up as described. I am not sure what is going on but think it is due to the cluster of digital reading for each. I think the electronics is doing a better job than we think and can tell the difference to a larger degree than we think. A target has a cluster of digital reading as we sweep the coil such as 3/28 for a penny which we all know but there will be other such as 3/27, 3/26, 3/28 and so on. When we use the small, medium, and large Cursor or box, we are setting the size of the notch window. If we learn to reject 3/28 with the small box we leave the cluster of digital reading in this area open. A good and bad target has to have an exact match of 3/28 to be rejected. This is why I use the small square to reject pulltabs. Any target in the cluster with a digital reading other than 3/28 is accepted.
There is a difference between a ladies ring with a diamond and a pulltab and I think the electronic can tell the difference most of the time. At least all the rings and tabs I have tested so far can be identified correctly. When I say identified correct I should add down to 6". After 6" the ID starts to drop off and at maximum depth will default to a low tone. I assume it is a default to or the user would get a high or mid tone on these ultra deep targets and be in the same boat as guys using the 3D in not knowing what a high tone means.
The programs and setting I have posted is to address the very problem we have encountered and you and the other address. How to get the best discrimination and still find the ladies gold ring with a diamond. In clean ground we can use a clear screen and select all of the trash items to be accepted. In the Smartfind or digital screen we will now have ICONS to help with the ID. If we use IM-16 we don't get the ICONS or if we use a clear Smartfind Screen without selecting the trash items to be accepted. We have to select all items in the menu if we want an ICON to help with the ID. This is important to the programs I use as I have found the ICONS to be very accurate and they will peep through just as a digital reading and tone will on ultra deep targets. When we combine the tones, tune played (Cluster of digital reading associated with a target), and ICONS we get a very good idea what is and is not a fine ladies ring and a pulltab, in my opinion.
However, for now give this a try. Select the factory preset Coins program and sweep over a pulltab. We get a nice clean hit with an ICON that indicates a Coin/Jewelry. Go back to the menu and Select a pulltab to be accepted. Nothing changes on the screen since the Coins preset will also detect pulltabs. Now sweep over the pulltab and now we see the ICON has changed to indicate a pulltab. Now go to Learn and reject the pulltab with the smallest cursor. Again sweep over the pulltab and we start to hear a sound for the tab and then it is rejected and there is a null. But we see an ICON for a pulltab.
A ring will give a nice clean hit while a pulltab breaks up as described. I am not sure what is going on but think it is due to the cluster of digital reading for each. I think the electronics is doing a better job than we think and can tell the difference to a larger degree than we think. A target has a cluster of digital reading as we sweep the coil such as 3/28 for a penny which we all know but there will be other such as 3/27, 3/26, 3/28 and so on. When we use the small, medium, and large Cursor or box, we are setting the size of the notch window. If we learn to reject 3/28 with the small box we leave the cluster of digital reading in this area open. A good and bad target has to have an exact match of 3/28 to be rejected. This is why I use the small square to reject pulltabs. Any target in the cluster with a digital reading other than 3/28 is accepted.
There is a difference between a ladies ring with a diamond and a pulltab and I think the electronic can tell the difference most of the time. At least all the rings and tabs I have tested so far can be identified correctly. When I say identified correct I should add down to 6". After 6" the ID starts to drop off and at maximum depth will default to a low tone. I assume it is a default to or the user would get a high or mid tone on these ultra deep targets and be in the same boat as guys using the 3D in not knowing what a high tone means.
The programs and setting I have posted is to address the very problem we have encountered and you and the other address. How to get the best discrimination and still find the ladies gold ring with a diamond. In clean ground we can use a clear screen and select all of the trash items to be accepted. In the Smartfind or digital screen we will now have ICONS to help with the ID. If we use IM-16 we don't get the ICONS or if we use a clear Smartfind Screen without selecting the trash items to be accepted. We have to select all items in the menu if we want an ICON to help with the ID. This is important to the programs I use as I have found the ICONS to be very accurate and they will peep through just as a digital reading and tone will on ultra deep targets. When we combine the tones, tune played (Cluster of digital reading associated with a target), and ICONS we get a very good idea what is and is not a fine ladies ring and a pulltab, in my opinion.