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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.
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