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58
Adjusting Receiver Sensitivity
• Press the
until GAIN is highlighted in the upper right
Jog Dial
corner of the display. Rotate the
counterclockwise, to vary the gain and thus control the strength of
echo returns on the radar screen.
An on-screen bar indicates the gain level selected. The proper setting
is when the background noise is just visible on the screen. (i.e. a light
speckled effect)
Adjusting TUNING
This procces is for Manual Tuning mode only. Manual Tuning can be
selected by MENU, RADAR SETTING, TUNE – Manual or
Automatic.
• Press the
until TUNE is highlighted in the upper right
Jog Dial
corner of the display. Rotate the
counterclockwise, to maximize the target echo. If there is no large,
identifiable target (e.g. big ship or land) within range, select SEA
CLUTTER and turn the control to minimum. Use these echoes from
wave crests to adjust the tuning bar for fullest attainable deflection.
This is best done with the range set to 3 NM or 6 NM. An on-screen
bar indicates the manual tune is selected.
When the radar has warmed up, it may be necessary to make a further
fine tune adjustment.
AUTO TUNE
The RADAR 1800 has an automatic tuning feature. In this mode, the
radar automatically tunes itself for best efficiency at all ranges. (Refer to
p.63)
Reducing SEA CLUTTER
ATTENTION
The SEA CLUTTER control is normally only used
on the shorter ranges to suppress the effect of
sea clutter formed by breaking wave crests
which the radar "sees" as solid objects. An on-
screen bar indicates the sea level selected.
If the Sea Clutter reduction is turned up too far,
small targets will be lost also.
• Press the
until SEA is highlighted in the upper right corner
Jog Dial
of the display. Rotate the
vary the sea clutter control and thus control the strength of echo
returns from the sea surface. The on-screen bar indicates the selected
level.
AUTO SEA
The RADAR 1800 has an automatic sea clutter control feature.
In this mode, the radar automatically suppress the effect of sea clutter.
(Refer to p.63)
clockwise or
Jog Dial
clockwise or
Jog Dial
clockwise or counterclockwise, to
Jog Dial
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