Auto-Tune Mode - Fisher Gold Bug Operating Manual

GROUND REJECT PROCEDURE
AUTO-TUNE MODE GROUND REJECTION
1. With your controls still set as described in the TURN
ON procedure, lower the search coil to an inch or
two above the ground. One of three things will
happen to the threshold tone as the coil is lowered:
1) The tone will get louder and then return to
normal as the Auto-Tune circuit takes over. (When
you raise the coil, the tone will fade.)
2) The tone will fade and then return to normal.
(When you raise the coil the tone will get louder.)
3) The tone will remain the same.
2. If the tone remains the same you're properly tuned.
3. If it gets louder, rotate the small center Ground
Adjust knob one or two clicks to the left
(counterclockwise) and lower the coil to the
ground again from 6 to 10 inches. If the tone still
increases, rotate the small knob some more and
fine tune with the large outer knob until the
Threshold tone remains the same (or changes very
little) when the search coil is raised or lowered.
4. If the tone fades when you lower the coil, tune
as in Step 3 except rotate the small GROUND REJECT
knob to the right (clockwise) and fine tune with
the outer knob until raising or lowering the search
coil has a minimum effect on the threshold tone.
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