7
ADJUSTING CONTROL
With the gain control turned all the way counter-
clockwise, move away about ten feet and depress the switch
on the RECEIVER hand grip. The head (the cross-like section
at the end of the probe rod) should be held close to the ground
with the two cross ends in a line which crosses the suspected
location of the structure. When the head is over the structure a
deep tone will be produced. The TRANSMITTER may now be
positioned exactly over the structure should this not already be
the case.
Now move away from the TRANSMITTER, sweeping
the RECEIVER head over the surface until a tone is heard. As
the distance is increased, it will be necessary to turn the gain
control in a clockwise direction in order to pick up sufficient
signal to produce a tone. Careful manipulation of the head and
control will allow the structure to be located within a few
inches.
When the distance between the TRANSMITTER and
the RECEIVER has reached a point where no sound is pro-
duced with the control turned fully clockwise, the last located
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