30 31
The detector may be affected by electrical interference from
thunderstorms and other climatic conditions, powerlines,
radio transmitters, electrical equipment or other detectors
operating close by (See Glossary, p. 89, for more information
on interference). This interference causes the Threshold to
become erratic.
So that the detector experiences the least interference for
the current environment, the search channel can be changed
automatically by the Auto Tune button on the control panel,
or manually in the Manual Tune (p. 59) setting via the
LCD menu.
Auto Tune instructs the detector to automatically test every
channel and select the quietest one for operation. Automatic
tuning may take up to 60 seconds.
The Manual Tune setting, via the LCD menu, allows you to
manually select and listen to every channel for the least
interference.
The best channel to select will be the one where the audio
response to electromagnetic disturbances (e.g. powerlines)
is the lowest.
It is best to tune with the coil away from the ground and as
stationary as possible. This gives the detector the best chance
of sensing all surrounding interference (not associated with
the ground or targets) to select the quietest channel.
Note: Interference in some locations can change during the
course of the day so you may need to re-tune from time to time
to maintain a stable Threshold as you move around the area.
There is only one Tune setting. Any changes made manually
will override the Auto selection.
Tip: If you would like to
know what channel has
been chosen after an Auto
Tune, access the Manual
Tune screen and check the
number displayed.
Tune
Reducing electrical interference.
Search Mode
Continued...
Custom (GPX 5000)
The Custom Search Mode provides a choice of four
additional search modes (p. 60) which can be selected from
the LCD menu.
These are:
– Patch (Factory Preset Selection)
– Hi-Mineral
– Hi-Trash
– Pinpoint
This allows a total of six separate search modes which can be
set up for different circumstances.
Patch
The Patch mode is set up for prospecting unknown ground
when you are likely to be walking and detecting faster, seeking
a first nugget that may indicate a new area worthy of further
investigation.
Hi-Mineral
See p. 28 for description.
Hi-Trash
This mode has factory presets specifically selected for
detecting in an area containing a lot of rubbish. The Iron
Reject (p. 72–75) setting has been factory set quite high so you
may want to reduce this if you want to be more cautious.
Pinpoint
This mode will provide a louder, more obvious response on a
target that has already been located in another Search Mode.
It is perfect for those faint, hard to hear responses.
All four of these Custom Search Modes can be renamed (p. 76).
GPX 5000
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