Minelab GPX-4500 Instruction Manual page 39

Stabilizer
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Range 1–20
The Stabilizer function controls the point at which
faint variations in the Threshold begin to be heard.
These faint variations can either be ambient noise
or faint target signals. As you increase the Stabilizer
control faints signals will become louder but the
noise level will also increase. This may potentially
hide a desirable target signal. The Stabilizer allows
you to mask faint variations, to provide a perfectly
stable Threshold, improving your ability to identify
faint target signals.
The Stabilizer is best left in the Factory Preset
position until the soil conditions are determined.
Once the Rx Gain level has been set for the local
Note: Regardless of which
conditions, and other audio settings have been
Audio Type is selected, the
selected, the Stabilizer can then be used to fine tune
optimal position of the
the Threshold stability.
stabilizer is one number
To find the optimal position of the Stabilizer ensure
below the point where the
the coil is being swept across the ground. One
threshold begins to chatter.
number below the point at which the Threshold
begins to chatter is generally the best setting.
Tip: By turning the stabilizer control close to minimum
(<3) the threshold will be very stable, but you will lose
a lot of sensitivity to smaller targets. This can be a
desirable feature in certain scenarios, such as looking
for large nuggets in a high-trash area, or using the
GPX-4500 to search for coins or treasure.
The effect of the Stabilizer could be seen as having a
similar effect to that of the Rx Gain control. However,
the Stabilizer effects the audio processing only and
does not change the Receive (Rx) signal, so it should
be used as a final stage fine tune.
After making any adjustment to the Stabilizer,
if the ground conditions change or you wish to
change coils, you may need to reset the Rx Gain.
Before doing so return the Stabilzer to the Factory
Preset setting. This will ensure you select the most
appropriate Rx Gain level to suit the conditions and
then you can fine tune the Stabilizer.
Tip: We recommend the best order for setting these
controls are:
1. Select an appropriate Search Mode
2. Select the desired Audio Type
3. Adjust Rx Gain until the threshold starts to break up
4. Adjust Stabilizer to smooth out the threshold.
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