White’s Electronics MXT 300 - Manual (Page 30)

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Chapter 6 MXT 300 Searching
Prospecting MODE
1. MODE to Prospecting.
2. Trigger (on hand grip) center "primary Search-
ing" position.
3. TRAC to Ground position.
4. GAIN to "P" position.
5. Threshold, adjust for slight hum (edge of
sound).
6. DUAL CONTROL to SAT "P".
7. Pump the search coil on the ground to be
searched until ground ceases to respond.
8. Move the coil just over the ground and listen
for the distinct repeatable beep produced by a metal
target. The Prospecting Mode utilizes a VCO (Volt-
age Controlled Oscillator) audio thus the pitch of
the beep varies with the strength of the target. It is
wise to plant metals just under the soil to practice
on in order to learn to recognize what it will sound
like. Planting a metal target disturbs the ground
mineral, which usually reduces the depth it would
have been found in undisturbed ground. It will take
practice to determine the proper search speed and
technique. Do not go too fast. Try to overlap your
sweep path so that you won't miss the small and/or
deeper metal targets.
9. Once a solid repeatable VCO beep is located:
A. Consult the display VDI number and %
? Iron.
B. Squeeze and hold the Trigger on the
hand grip and "X" the area to pinpoint.
OPTIONAL method for iron.
10. Lock Trigger (on hand grip) forward.
A. Ferrous (iron) targets now sound the
same as all other metals rather than being
indicating by a grunt.
11. Ground Mineralization:
A. For Salt/Alkali environments proceed
exactly as above only with the TRAC toggle
in the Salt position.
B. For areas with an abundance of decom-
posed man made iron (which may make
the MXT 300 diffi cult to operate), proceed
exactly as above only once you pump the
loop over the ground in the Ground TRAC
setting, then set the TRAC control to Lock.
C. For highly inconsistent ground it may be
necessary to increase the Dual Control SAT
adjustment clockwise. Hyper SAT provides
threshold maintenance for the most extreme
conditions. Search coil motion becomes
increasing more critical at these higher SAT
speeds.
Chapter 6 MXT 300 Searching