Mode And Mineralization Switches - Fisher GOLD BUG-2 Operating Manual

CONTROL PANEL (continued)
6. grOunD reJeCt: This dual-knob control is used to
electronically tune the searchcoil to prevailing ground-
mineralization conditions. The small knob on top only makes
one revolution and is used for coarse adjustments. It has 25
fixed positions. The large knob on the bottom is for fine-tune
adjustments and is capable of 16 turns and an infinite number
of positions.
7. tHreSHOlD: This metal shaft is located on the rear of the
control housing. It's purposely small and out of the way to avoid
accidental adjustment. The threshold control adjusts the level of
your threshold tone, which is set to a continuous, faint tone.

MOde and MIneRalIZaTIOn sWITCHes

The mode switch on your Gold
Bug™-2 offers three different
operating modes: IRON DISC,
NORMAL and AUDIO BOOST. Each
mode offers its own advantages
and disadvan- tages in any given
situation. It's up to you to find the
right setting for each of the ground
conditions you encounter.
Regardless of the MODE or
MINERALIZATION settings, your
Gold Bug™-2 always operates in a
motion mode, meaning the searchcoil
must be in motion to detect a target.
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Figure 6.
The two toggle switches on your Gold Bug™-2
enable you to search in just about any kind of
ground condition. The trick is learning which
combination of settings is right for each ground
condition.
false sIGnals
A false signal occurs when something that shouldn't sound like a good
target sounds like one. For example, the Gold Bug™-2 may detect metal
in your boots if you swing your searchcoil too close to your feet. Here's
some other sources of false signals, and here's what to do about them.
1. Hot rocks: Mineralized rocks that respond like metal.
Solutions: Most hot rocks seem to be on top of the ground, so
you can just kick them out of the way and recheck the ground
beneath them. The Gold Bug™-2 will ignore some hot rocks.
Certain other types of hot rocks have their own distinctive sound,
which you'll learn to recognize. Or you can "tune-out" most hot
rocks in the air or on the ground by adjusting the GROUND
REJECT knob right over the rock. If it's a nugget, you won't be
able to tune it out unless it's very small. Many strong hot-rock
signals will disappear rapidly when you lower the sensitivity level,
whereas a strong nugget signal will just get weaker. Of course,
the best way to check a possible hot rock is to flip your mode
switch into "IRON DISC."
2. Highly Mineralized Soil: Unfortunately, this is where most
nuggets are found. The Gold Bug™-2 will handle all but the
very worst soil.
Solutions: Switch to the HIGH mineralization setting. Ground
adjust very carefully and often. Lower the sensitivity. Ground
adjust to a height just high enough to eliminate most false
signals and adjust your stem length to sweep at that height.
3. Dissolved Salts: On a wet ocean beach or moist inland soil.
Solutions: Same as highly mineralized soil.
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