<
Operate Keys and
Controls
Depending
on Circumstances
>
Refer
to
paragraph
3.2
and
after.
<
To
suspend
radar
operation
>
Press
the
OPERATE
key
once.
The
radar
will
stop transmission and
the radar picture
will
disappear.
To
resume
radar operation,
press
the
OPERATE
key
once
more.
<
To
Stop
Radar
Operation
>
Press
the POWER SWITCH more than
3
seconds.
2.3
Sea
Clutter Suppression
(STC)
2.3.1 Manual Sea Clutter Suppression
(
STC:
Sensitivity
Time
Control)
(i)
Press
the STC key. The underlined numerical
indication shown below
will
be displayed and the sea
clutter suppression mode
(STC)
will
be
set.
F
0
G30
Indicates
STC
adjustment mode
is
selected.
(ii)
Turn the control knob to adjust the level. The
STC
adjustable range
is
from
0
to
50.
even when the sea
is
calm. When the sea
is
rough, intense
echoes appear over a wide area and sometimes make targets
invisible.
The STC control decreases such
sea
clutter
and makes
targets easily visible.
Turn
the control knob clockwise to
decrease sea clutter.
If
the control knob
is
turned too
far,
echo signal from important targets may disappear.
Adjust the control very cautiously by observing the
picture with utmost care.
Usually the STC control should be
set
so
that there
is
no sea clutter at
or
near the display center when the
sea
is
calm, with the distance range preset to
a
minimum
or
0.125
NM.
short
-
distance sensitivity (gain) lower and the long
-
distance sensitivity (gain) higher.
For
this reason, no
picture may emerge on the display
if
the sea
is
calm and
there
are
no
large targets
near
your ship when the range
is
set
to
0.125
to
0.5NM
and
the
level
is
more than
30.
2.3.2 Automatic Sea Clutter Suppression
(1)
Automatic Sea Clutter Suppression and Automatic Gain
Sea clutter
is
observed from short
-
range sea surfaces
The STC
circuit
is
designed primarily to make the
Control
Press
the
AUTO
key.
The
indication shown below
will
be displayed and the auto sea
-
clutter suppression mode
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