with target ID features, this can cause some problems. We have created a very specific double
beep signal that lets you know when a target is very close to the coil.
Start with any of your targets and start waving it about 4 inches away from the coil. Slowly
move the target towards the coil until you hear the double beep. At that point the detector is
telling you that it is saturating and will not identify correctly. Also remember that the size,
shape and composition of the target will also affect the saturation signal. A large iron horse-
shoe will cause more saturation than a silver dime. When you encounter this signal in the
field, just lift your coil up about 2 to 3 inches and the signal should stabilize. Take some time
to find the saturation point for your targets.
Next we will wave different targets at the coil and see what kind of response the machine
gives us. Start by waving your quarter about 3 to 4 inches away from the coil. You will hear
the detector's highest tone. This tone will cover from zinc pennies up to all of the silver coins
and silver jewelry. Next wave the pull tabs at the coil one tab at a time and note the tones. All
pull tabs will fall into the two middle tones. The second highest tone will cover most of the
pull tabs, some gold rings and screw caps. Now wave your nickel. The tone you are hearing
will cover foil, nickels, gold rings and some pull tabs. Please note that there is some overlap
of both gold rings and pull tabs. This manual will go more into detail about that in the
“Set
Notch Window Width”
section. Last wave your iron target. You should hear the lowest tone
of all. This tone covers iron and foil. Some iron targets such as washers or other oddly shaped
items may produce a “rolling tone.” This tone is a combination of both high and low tones. It
may start high and go low or start low and go high. Take some time to try your targets and get
used to the tones they create. You may also want to take a selection of other targets and see
what tone they produce.
Perform Air Test in DISC Mode
As discussed before, the Discriminate Mode is used to filter unwanted targets from good
targets. The principle behind this is pretty simple. The detector sends out a signal and then
receives it back creating a small electronic field. As metal passes through the field that the
detector generates, it causes a change in the received signal. The amount of change that each
type of metal causes is fairly constant; therefore, we can tune our detectors to miss the targets
that we don’t want to find. The change is based on the type of conductivity that each target
has. The general list of conductive targets is as follows: iron, foil, nickels, gold jewelry, pull
tabs, screw caps, pennies and silver coins starting with dimes and working up to silver dollars.
This list is meant to be a guide only. There is a point that some gold rings and some pull tabs
overlap. Also the depth of the target and its orientation in the ground can change the received
signal. A coin that is flat to the coil will produce a better signal than a coin that is on edge.
Take some time now to try different combinations of depth and orientation of your targets and
find out how your detector responds.
