17
SEARCH MODES
8.
Most silver rings will give a high tone. Most gold rings
will fall into the pull tab/foil mid-tone category. This is
due to the unavoidable fact that most gold rings are
conductively similar to aluminum foil and pull tabs.
Some are more closely identical to the U.S. 5-cent
piece; however, the CZ-21 does have the unique
ability to separate those signals from the aluminum
trash signals.
9.
Now increase the DISC control to “1.” You will find
that the CZ-21 rejects the small, iron targets and no
longer responds with an audio tone.
10.
Continue to increase your DISC control, noting
that with each successive step up, more and more
targets are rejected. At DISC = “4” for example, a
“coins-only’ mode will ignore iron, tabs and foil while
accepting U.S. coins.
11.
The target I.D. decal on the left underside of the
control housing graphically displays which items
are rejected and accepted at each DISC level. For
example, “foil” is placed between DISC = “2” and
DISC = “ 3.” This means that foil is accepted at “2”
Figure 8.
Typical CZ-21 Audio Responses
24
TARGET IDENTIFICATION
coin.
5.
The DISC control provides increments of rejection and
identification within the mid- and high-tone target
classifications. Take a look at the target I.D. decal
on your control housing to see what gets rejected
at which DISC point.
6.
If you’re getting a high-tone response for example,
you may well be over a U.S. coin. If you want to know
what kind of coin it is, advance the DISC control to
“5.” You know from the I.D. decal that if you lose the
signal your target is probably a nickel (or something
conductive and very similar). If you don’t lose it, go
up to “6.” If you lose it at “6,” your target may well be
a U.S. zinc penny. If you still get a signal, your target, if
it is indeed a coin, will probably be a copper penny,
an older silver coin or a clad coin. Most other small
targets will be ignored.
7.
The same is true of the mid-tone targets: Round pull
tabs are rejected at “2,” foil at “3” and rectangular
tabs at “4.” If, for example, you’re looking for gold
rings in an extremely trashy area, you have the ability
to reject at least some of the trash (like iron, round
tabs and foil) and still get those rings falling into the
rectangular tab and all coin categories. Of course
you’ll have to dig rectangular tabs as well.
8.
Your CZ-21 will correctly identify most of the targets on
your I.D. decal most of the time, but it
can be fooled.
Large targets, uneven ground mineralization, good
targets lying next to bad targets, deep targets, all
of these and more are sources of error. Remember,
the CZ-21 is designed to I.D. small, coin-sized targets
only, and even some of these may be deep enough,
bent, damaged, or corroded enough to give a false
signal.
9.
You should also realize that there are many good
targets which are not classified by the CZ-21, as
mentioned earlier. Gold rings, for example, may fall
into any category except iron. Many foreign coins,
especially the new ones, may I.D. as foil or pull tab.
Gold nuggets, depending on their size and shape,
