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Tune
Reducing Electrical Interference
The detector may become noisy due to electrical
interference from powerlines, radio transmitters
electrical equipment or other detectors operating
close by. The detector interprets this interference by
Auto Tune
the Threshold becoming 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 setting via the menu.
Auto Tune instructs the detector to automatically
listen to every channel and select the quietest
channel. Automatic tuning may take up to 60
seconds.
The Manual Tune setting, via the main menu, allows
you to manually select and listen to every channel
for the least interference.
If you would like to know
The best channel to select will be the one where the
what channel has been
audio response to electromagnetic disturbances
chosen after an automatic
(e.g. powerlines) is the most reduced.
Tune, access the Manual
It is best to select a channel with the coil away from
Tune screen and check the
the ground and as still as possible. This gives the
channel displayed.
detector the best chance of hearing all surrounding
interference (not from the ground or targets) and
selecting the quietest channel.
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 smooth Threshold as you move
around the area.
Note: There is only one Tune setting. Any changes
made manually will override the Auto selection.
Auto Tune
Tuning should be done
initially with the Coil
switch in Double-D
or in Monoloop (M). If
the interference is still
severe after completing
the tuning operation,
change the Coil switch to
Cancel and only re-tune
the detector again if
(pg. 63)
necessary.
To Perform an Automatic Tune:
1 Hold the detector at waist height and the coil
vertical and slowly rotate through a half-circle,
making sure there are no large targets or obvious
electrical interference sources close by. Listen for
any increase in interference as you move.
Note: If you have difficulty holding the detector very
still for 60 seconds, you can place the detector on the
ground with the coil vertical.
2 Press the Auto Tune button. Keep the detector
completely still during the automatic channel
selection.
A single beep indicates the beginning of the Auto
Tune. The detector will begin to scan each channel
for the least interference. This may take up to 60
seconds.
The detector will then select the quietest
operating channel that was identified. The end
of the Tuning process will be indicated by three
sharp 'beeps'.
When tuning the detector in close proximity to other
detectors, each operator needs to take turns tuning.
Do not try to tune two detectors at the same time.
If Auto Tune is not working
well in Slow or Very Slow
Motion, try selecting Medium
setting. Perform another
Auto Tune and then return to
the original setting.
500mm (20")
33
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