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Automatic adjustment of sensitivity
1. Press the [GAIN] key once or twice to display
the screen shown in Figure 2-5.
AUTO GAIN MOD
LOW HIGH
1 2 3
Figure 2-5 Dialog box for
automatic adjustment of gain
2. Press
or to set level desired: 1, Low; 2,
Normal; 3, High.
Manual adjustment of sensitivity
1. Transmit on long range.
2. Press the [GAIN] key once or twice to display
the screen shown in Figure 2-6.
MAN GAIN MOD
LOW HIGH
32
Figure 2-6 Dialog box for
manual adjustment of gain
3. Press
or to set level desired. 61 levels
are available.
Note:
The dialog boxes for adjustment of
sensitivity are automatically erased when there
is no Omnipad operation for 10 seconds. To
erase them quicker, press the [GAIN] key after
completing the setting.
2.8 Suppressing Sea Clutter
In rough weather, returns from the sea surface
are received over several miles around own ship
and mask nearby targets. This situation can be
improved by properly using the [STC] key.
If the STC setting is too low, targets will be
hidden in the clutter, while if it is set too high,
both sea clutter and targets will disappear from
the display. In most cases adjust the key until
clutter has disappeared to leeward, but a little is
still visible windward.
A common mistake is too over-adjust the [STC]
key so that the surface clutter is completely
removed. By setting up for maximum STC effect,
you will see how dangerous this can be; a dark
zone will be created near the center of the
screen, causing a loss of close-in targets. This
dark zone is even more dangerous if the
sensitivity has not been properly adjusted.
Always leave a little surface clutter visible on the
screen. If no clutter is observed (on very calm
waters), turn off the circuit.
STC adjusted;
sea clutter suppressed
Sea clutter at
screen center
Figure 2-7 Appearance of sea clutter
Automatic sea clutter control
1. Press the [STC] key once or twice to show
the dialog box shown in Figure 2-8.
AUTO STC MOD
LOW HIGH
1 2 3
Figure 2-8 Dialog box for
automatic adjustment of STC
2. Press
or to set level desired: 1, Low; 2,
Normal; 3, High.