in small increments until there is little or no
change in the threshold hum as you bob the
search coil.
7.
With a little practice, you should be able to
ground balance quickly by "bobbing" the search
coil up and down in a continuous movement as
you adjust the GROUND BALANCE control with
your thumb.
The "bobbing" method takes a little more practice, but you
may find it slightly more accurate. You may hear and see
fewer false signals if you're in highly mineralized ground. Or if
you're hunting in the AUTOTUNE mode, be sure to use the
"bobbing" method.
NOTES:
1.
If you get an audio response as you first lower
the coil, with the GROUND BALANCE control at
10, you're probably over a piece of metal. Move
away and try again.
2.
If you get a sudden bell tone, not preceded
by an increasing audio response, you're probably
in some very highly mineralized soil or sand.
Instead of lowering the coil to an inch or two
above the ground, stop just before you hear the
bell tone and ground balance a few inches
above the ground. Because of highly mineralized
ground conditions, it will be necessary to lower
your sensitivity and maintain that coil height as
you search.
3.
If you don't get an audio response, or if the
hum stays about the same, no matter where you
set the GROUND BALANCE control as you bob
the search coil up and down, you're probably in
an area where there's very little ground
mineralization. Just leave the GROUND BALANCE
control set to 10 and start searching.
GROUND BALANCING
21
