False Signals - Fisher Gold Bug 2 Operating Manual

FALSE SIGNALS

A false signal occures 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 search coil 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.
3. Dissolved Salts: On a wet ocean beach or moist
4. Junk: Nails, pull tabs, beer cans, etc. The Gold Bug-
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.
inland soil.
Solutions: Same as highly mineralized soil.
2 was designed for extreme sensitivity to small bits
of gold. That means it's also extremely sensitive to
small bits of ferrous metal.
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