Searching - Fisher GOLD BUG-2 Operating Manual

GROUND REJECT PROCEDURE (continued)
3. Your objective now is to adjust the GROUND REJECT control
so that there is no change or at least only a small change in
the threshold hum as you bob the coil up and down. Start by
clicking the small, center knob back to about 8.
4. Bob the searchcoil up and down once again. One of three
things will happen to your threshold hum:
1) The tone will continue to get louder as you lower the coil
and disappear when you raise it.
2) The tone will disappear as you lower the coil and sound
off as you raise it.
3) The tone will remain the same or change only slightly.
5. If the tone remains unchanged or changes only slightly, you
are probably "Ground Balanced." You can fine tune, if required,
with the larger knob.
6. If the tone gets louder going down and fades coming up, continue
rotating the small knob counterclockwise until the tone change is
minimal when you bob the coil. Fine tune with the large knob.
7. If the tone fades going down and increases when the coil is
raised, rotate the small knob clockwise until the tone change
is minimal, then fine tune with the large knob.
8. With practice, you will learn to click the small knob
counterclockwise as you bob the coil. Listen for the change
in the tone to switch from the down stroke to the up stroke.
Then, while continuing to bob the coil, rotate the large knob
clockwise until the tone becomes even or until you hear only a
slight change on both the up stroke and the down stroke.
9. If you are having trouble ground balancing, try one or more
of the following:
1) Move to another spot in case you're over a piece of buried
metal.
2) Reduce your SENSITIVITY setting.
3) Change your MINERALIZATION setting from LOW to
NORMAL or from NORMAL to HIGH.
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seaRCHInG

1. Keep the searchcoil moving at a comfortable rate. Remember
that the Gold Bug™-2 is a motion detector and responds only
when the searchcoil (or the target) is moving.
2. Keep the searchcoil parallel to and as close to the ground
Figure 11.
The Gold Bug™-2 is built for balanced
searching in a tight semicircle around
the front of the operator.
6. Recheck the ground adjustment frequently by raising and
lowering the searchcoil and listening for changes in the
threshold volume. In some nugget-bearing areas, ground
mineralization can change drastically within a matter of feet,
so check it often.
7. Try backing off the sensitivity control if you hear too much
ground chatter and false signals. If you find you must decrease
the SENSITIVITY control below 5, it's probably a good idea
to change the MINERALIZATION setting to NORMAL and set
the SENSITIVITY control back to 10. You also might have to
retune the GROUND REJECT control slightly. Remember,
when you switch from LOW to NORMAL MINERALIZATION,
as possible. This is important for
maximum coverage and depth.
3. Overlap your sweeps at least one
half the length of the searchcoil.
4..Search in a methodical
manner and sweep your
searchcoil in a tight
semicircle. Pay close attention
to where you're going and
where you've been.
5. Take your time. If you walk
too fast, you won't overlap
your sweeps, and you'll miss a
lot of ground. If you sweep too
fast, you'll lose sensitivity and
miss small, deep nuggets that
normally would be within the
range of your Gold Bug™-2.
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