White’s Electronics MXT Pro - Manual (Page 27)

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Chapter MXT Pro Controls
tal interference or from inconsistencies in ground mineraliza-
tion. This can be heard as chatter when excessive. Faster
SAT speeds tend to calm this interference allowing target
sounds to be separated and identified compared to non-tar-
get or ground noise.
The MXT Pro is computerized, which allows improved SAT in
ways not practical in the past. These improvements “kick in”
progressively at higher settings allowing better ground silenc-
ing in highly variable ground. At these higher settings, cold
rocks (rocks well below the current ground mineral rejection
level) will sound “different” giving a “double blip” sound or
vanishing entirely, rather than giving the “boing” sound you
will get at lower settings. A major difference between a gold
nugget and a cold rock response is that when you sweep
back and forth, the gold nugget will “stay in one spot” but the
cold rock will seem to keep wandering around. This can also
be the case with a pocket of negative mineralization.
GAIN and VARIABLE SAT (Self Adjusting
Threshold) Speed-
The TRAC feature compensates for common ground miner-
als in the area. The SAT control compensates for the incon-
sistency of the ground mineralization. The greater the degree
of inconsistencies, the more SAT is needed to quiet ground
noise. If the THRESHOLD becomes too erratic or noisy, it
might be necessary to use the SAT feature and/or reduce
the GAIN control. This noisy behavior will make it difficult
to recognize a true target (possible nugget) from pieces of
mineral, commonly referred to as “hot rocks”. It is not wise
to keep a high level of GAIN if the detector will not oper-
ate smoothly. This is a false sense of security. Maintain as
smooth a threshold as you can. Recognizing a true target
is the most important part of detecting. This is an example
of when less GAIN will produce more nuggets. You must be
the best judge of just how much noise you can tolerate and
still identify nuggets, and thus the amount of SAT and GAIN
to use to produce the desired results in your area. If you
have been operating your MXT Pro at the full level of GAIN
(+3) and you determine that this is too high because either
the threshold is erratic or the detector is giving false sig-
nals; always begin by reducing the GAIN toward the Initial
Setting triangle. If this does not correct the problem, start
adding some SAT speed by turning the SAT control slowly
clockwise. If this does not correct the problem, go back to
the GAIN and reduce it a little more and add a bit of SAT. It
is sort of like seasoning a pot of soup. Some salt and some
pepper. Remember any drop in GAIN below (7-8) will result
in some loss of depth. Any increase in SAT speed above the
“P” setting may also affect overall depth.
However, before reducing the Gain below 7 - 8 you might
try to experiment a bit with the HYPERSAT range of the
SAT control. This function is unique to White’s SAT. The
Threshold will almost buzz and loss of depth will be minimal.
Reserve this option for situations where ground is unusual
or conditions extreme.
If the Threshold cannot be stabilized with small reductions
in Gain and small increasing SAT, then “jump start” SAT into
the HYPERSAT range. Before attempting this, you might
practice sweeping over a test nugget to learn to identify it’s
sound with HYPERSAT. We like to use the analogy of driv-
ing on a straight road versus a curvy road. The object is to
get from point A to point B. 65 mph might get you there on a
straight road, but you will have to slow to 35 mph if the road
is curvy, or you will end up off the road. The straight road is
like low mineralized ground and the curvy road is like heavy
mineralization. High Gain and slower SAT will not recover as
much Gold in heavy mineralization as lower GAIN and faster
SAT.
GAIN Control
SAT SPEED CONTROL
(Prospecting Mode Only)