My fisher always sees screw caps as quarters. I have been using the machine for over a year now, and I can tell when the target is a quarter, and when it is a screw cap.
Is there a way to make the machine disc them out, without losing quarters?
You said you "can" tell the difference so what is the problem?
I suspect this was a mistake in typing and you meant you "can't" tell the difference because most of us can't by just swinging over these problem targets.
This is a common problem on most detectors that have a DD coil mounted, like yours.
That wide scanning field is great for covering large areas, but the disc is not as precise as a concentric coil so it reads those high tone bottle caps as quarters.
The problem is NOT with your machine and you can't disc them out.
If you switched over to any of the concentric coils the quarters should still be 80-82 and those bottle caps will now come in lower.
There is a technique that you can use that will probably work with that DD coil and can tell you when you are swinging over one of these and not a quarter, however.
It is called "Rimming", and Rudy posted this telling us how to do this many years ago.
http://metaldetectingforum.com/showthread.php?t=15664
When you come across one run the rim area of the heel or the toe of your coil past the area this target is laying and if you do this at the right speed the numbers on the screen should drop low into the iron section.
Quarters won't do this...they will stay high.
I have tried this with my Vaq and my big DD coil and it works, but it takes longer because I have to turn down the disc knob to iron to figure them out.
On a detector with a screen, the numbers should just drop and should be much faster..instantaneous, actually.
