59
GPX 5000 Range
GPX 4800 Range
Factory Preset
0–255
0–255
128
Manual Tune
Reducing electrical interference.
Manual Tune allows you to scroll through and select a
particular channel.
Manual Tuning through the full range is time consuming.
We recommend that you use the Manual Tune for fine
adjustments after performing an Auto Tune (p. 32).
You may find that you can select a channel at one end of
the scale, or the other, if detecting in a quiet area with no
interference. Low numbers are lower frequency channels
and high numbers are higher frequency channels. High
frequency channels can be slightly more sensitive to smaller
targets close to the surface. Low frequency channels can
give a little more depth to larger targets, but the difference
is only marginal.
1 Hold the coil vertical and 100mm (4") above the ground
making sure there are no large targets or obvious electrical
interferences close by.
2 Access the Manual Tune screen via the menu.
3 Slowly increase or decrease the numbers, pausing after each
change to test the stability.
4 Listen to each channel in the range until you hear
the least noise.
Note: If interference persists after tuning try reducing the Rx
Gain setting, but in high interference areas you may need to
use Cancel on the Coil/Rx switch.
If the setting control is turned quickly you will notice
noise caused by rapid movement through the channels.
This is normal and will not be present when the control is
turned slowly.
100mm (4")
Note: A slower Motion
speed (p. 62) will also reduce
instability due to interference.
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