Signal Peak / Adjusting Pitch Variation Of Target Signals; Target Volume - Minelab GPX-4500 Instruction Manual

Signal Peak
72
Adjusting the Pitch Variation
of Target Signals
Range
A high Signal Peak setting
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will increase the pitch
variation of the target
signal. However, in highly
mineralised ground this
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high variance of signal
may make the detector
appear noisy.
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A low Signal Peak
setting will decrease the
pitch variation so target
signals will sound
more monotone.
Note: People who suffer
high frequency hearing loss
may prefer to use a Signal
Peak setting of 10 or less.
1–20
You are more likely to hear a target signal when both
the volume and the tone of the target signal change
upon detection rather than the volume alone.
A target signal on the GPX-4500 is normally a two-
tone signal. A target signal which first falls in pitch
and then rises is normally a deep target. A 'rise and
fall' of the pitch characterises a small target.
The Signal Peak control sets the level of variance
between the high and low pitch of the signal.
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Target Volume

Range
Tip: A lower Target Volume
is recommended in high
trash areas.
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1–20
Target Volume
The Target Volume controls the strength of target
signals and at settings above 8 it will slightly increase
the volume of the threshold as well. This is useful
for very windy conditions, people suffering from
hearing loss, or when using external speakers. With
the audio amplifier built into the Li-Ion battery pack
you can plug a speaker directly into the battery, and
set an appropriate level of amplification using the
Target Volume.
Be aware when switching from headphones to an
external speaker; you may need to make minor
adjustments to your Threshold (pg. 34)
Limit (pg. 56) controls.
The Target Volume can be used as an Audio boost
in quiet conditions and can also be used to reduce,
or smooth out, ground noise signals in highly
mineralised soils. This is a powerful feature and
will work in conjunction with the Stabilizer control,
giving you the ultimate in fine tuning ability. A bit of
experimenting may be required to find the optimum
combination in different conditions.
Note: If you are using the Target Volume to control
ground signals and adjustments to the Rx Gain are
required (due to a change of coil or location), make
sure the Target Volume is returned to the Factory
Preset setting first. You can then fine tune to suit the
new conditions.
73
and Volume