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FALSE SIGNALS
sensitivity level, taking shorter, slower sweeps, or
increasing the discrimination level may reduce
the number of false signals caused by trash.
2. Deep Targets: Deep targets, just barely within the
range of the CZ-20, may be misidentified. For
example, a deep coin may I.D. as iron, or a deep
piece of iron may I.D. as a coin. There’s not much
you can do to avoid this other than to use your
pinpoint mode to ensure that you are exactly
centered over the target. Or you may reduce your
sensitivity level so you just ignore the very deepest
targets.
3. Electrical Interference: Constant chatter caused
by radio/TV stations, power lines or nearby
detectors operating at one of the CZ-20 search
frequencies. The best solution is to move away from
the source of the interference. You may also try one
of the following: switch to the Autotune mode;
reduce your sensitivity level; slow down your
sweep speed. If the interference is only minimal
and you wish to continue searching anyway, test
your CZ-20 over a known target to make sure it’s
operating properly. Inside some buildings, electrical
interference may be so bad that you’ll have to go
outside just to bench test your CZ-20.
4. Highly Mineralized Soil: May cause a bell tone
response or constant false signals. Check your
ground balance (see the “Ground Balance”
section referring to mineralized soil). Try lowering
the sensitivity and/or increasing the discrimination
level. Search in the AUTOTUNE mode. Re-ground
balance using the “bobbing” method. If all else
fails, raise the search coil just high enough for the
false signals to disappear and then sweep at that
constant height.
5. Black Sand: Same as Highly Mineralized Soil.
6. Wet Salt-Water Sand: Your CZ-20 should be able
to handle most wet sand easily unless it’s black (see
Black Sand above). You should able to reduce the