Chapter 4 GM24k Controls
®
Current
Sensitivity
Level
Sensitivity
Increase
Sensitivity
Decrease
Controls
Sensitivity Control
With the SENSITIVITY control, you increase
the signal strength coming from the ground. You
might expect increased signal strength to always
find more nuggets at greater depths. However, high
ground mineralization will “bounce” the signal
back and mask good targets. It is therefore nec-
essary to ADJUST the SENSITIVITY to give you
the maximum allowable SENSITIVITY without
masking targets or over-loading the circuit and at
the same time allowing you to operate the detector
with a constant threshold hum so that faint signals
can be detected.
This is where the
GM24k
can help you out.
When
ground mineralization is too high for the
current
SENSITIVITY control setting, the display
shows
you a series of lines
along with
an audible “
alert
”.
Reduce the SENSITIVITY till the
overload warn-
ing ceases. On occasion, while
searching, you
might go over a very large or very
shallow target.
This will result in the same type of behavior. Lift-
ing the coil higher may reveal some information
on the target. You still might want to dig it up!
Sensitivity Adjustment
1.
The UP and DOWN buttons control the SENSITIVITY. Each press on the UP button increases from a
minimum level of “0” to a maximum level of “10”. Please note that levels 0-9 adjust the system gain, and
that setting 10 enables an Audio Boost for maximum sensitivity.
2.
Average ground conditions will generally allow for settings of 5-7 on the SENSITIVITY setting. In
mild ground you may be able to run as high as 10, and in extreme ground you may need to lower the sen-
sitivity to under 5. If the GM24k overloads, your sensitivity is set too high!
3.
One way to look at the SENSITIVITY control is like the accelerator in your car. Sometimes you have
to ease off for better control, and other times you can go “full throttle” for maximum performance.
8
Summary of Contents for GM24k
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