58
GPX 5000 Range
GPX 4800 Range
Factory Preset
59
GPX 5000 Range
GPX 4800 Range
Factory Preset
Special
Continued...
0–255
0–255
128
Manual Tune
Reducing electrical interference.
Sens Smooth, Fine Gold, Sens Extra, Salt/Gold, Sharp, Coin/Relic
Sens Extra, Sharp, Coin/Relic, Salt-Coarse
Fine Gold (GPX 5000), Sens Extra (GPX 4800)
Sharp
Sharp is similar to Normal but it puts out a more powerful
detection field. It is capable of an improvement in depth, but
it is more susceptible to interference and will also increase
the severity of false signals in difficult grounds. The Sharp
timing is best used in quiet conditions and can work well in
combination with Deep Search Mode; with a reduced
Rx Gain setting.
Coin/Relic
Coin/Relic is designed for use in lightly mineralised soils
including many beaches. It offers maximum detection depth
on a range of target sizes, significantly greater than any other
timings. However, if the ground is any more than lightly
mineralised, the detector may not ground balance. Coin/
Relic should work very well in most common parks, ovals, and
old home sites, so is the preferred timing when using your
detector for coins, jewellery and relics. On ocean beaches
containing significant quantities of black sand, better results
may be had by using Normal, or Salt/Gold (GPX 5000).
Salt-Coarse (GPX 4800)
The effect of alkaline salt mineralisation is vastly different to
the effect of ironstone and mineralised clays. Anyone who
operates on dry salt flats will know how difficult they can be
to detect. Normal should be tried first in these areas, but if
the Threshold is too unstable then better performance will be
obtained in Salt-Coarse.
Using the Salt-Coarse timing may result in a slight loss in signal
response to smaller targets. However, the response on larger
targets remains relatively unaffected and ground noise is
usually minimised. Therefore, when searching for large deep
nuggets in highly mineralised soil, the Salt-Coarse timings can
be used to obtain a smoother Threshold allowing you to hear
those mellow deep nugget signals.
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.
Note: Sharp will normally work
best with DD coils.
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