Scotto,
I posted this on another forum but this might help you.
I believe on notch machines (ace 250) there is no loss of depth
as in some of the progressive disc machines. But by running a lower
disc like relic or AM you will learn more about a target.
Try this test. Take a copper cent,dime (high coin) and hold a
medium size nail ON the coin. Swing over your coil in the "coin
mode" what do you hear? Depending on how the nail is positioned you
may hear a coin beep every 3rd pass, maybe every other pass? Maybe
evry 6th pass? You might think it's one of those false signals you
seem to be getting when your out in the field.... Maybe if you heard
that sound you may not dig it?
Now holding the coin and nail the same but this time in AM mode.
Swing the coin and nail over the coil now. What do you hear? You
hear a low tone and high tone probably? Now you have just heard your
detector tell you that you may have a coin next to some iron. Now
you have more info to dig or not. So by running a low discriminate
setting you will be digging more iffy targets that turn out to be
good ones. I use this method after I have cherry picked. Also if
you have a lot of time to dig more targets.
I admit if I only have like 30 minutes to hit a site I will run
in the coin mode first(cherry pick). Then each time I go back to the
same site I will lower the disc as time permits. This way you will
eventually retrieve most of the targets
