Adjusting The Radar Image - Simrad NSS9 Evo3S Operator's Manual

image and radar overlay on a chart. An enabled sector is shown as a magenta outline with 3
arcs crossing the blanking area. To specify radar sector blanking, refer to the unit's installation
manual.
Main radar PPI

Adjusting the radar image

You may be able to improve the radar image by adjusting the radar sensitivity, and by
filtering out the random echoes from sea and weather conditions.
The radar control images are located in the upper right corner of the radar panel. You can
adjust the image settings by selecting the radar control image or by pressing the rotary knob.
The selected control expands and displays its name in full and a slide bar is displayed. You
can then adjust the value by turning the rotary know or by using the slide bar.
You can also adjust the image settings from the radar menu.
Menu options can vary depending on your radar's capability.
Radar modes
Use modes are available with preset control settings for different environments. Not all
modes are available for all radar transceivers.
Modes in dual ranges
When connected to a radar with dual range capability, it is possible to run the radar in Dual
Range mode.
Modes can be set independently for each range. For example, you can have Offshore mode
for range A and Weather mode for range B. However, interaction between ranges occurs in
some cases:
• When using Bird mode for both ranges, maximum range is restricted to 24 NM and range
resolution is reduced.
• Fast scan - The antenna rotation speed is set to the slower of the two modes selected. For
example, Fast Scan is disabled when using Harbor and Weather modes because Fast Scan
is Off in Weather mode.
• The Interference reject setting can affect the interference seen or removed on both
ranges.
Directional clutter rejection
This mode automatically works when GAIN = AUTO and SEA = HARBOR or OFFSHORE. The
purpose is to allow smaller vessels to be seen in the leeward direction of the sea clutter. The
GAIN of the radar receiver is increased dynamically during the sweep, in the leeward
direction, for increased target sensitivity in heavier sea states.
When GAIN or SEA = MANUAL, the Directional Clutter Rejection mode will be OFF (non-
directional).
In addition, CALM, MODERATE or ROUGH STC Curve settings are available in the Radar
options menu to better optimize the radar image to your liking.
Gain
The gain controls the sensitivity of the radar receiver.
A higher gain makes the radar more sensitive to radar returns, allowing it to display weaker
targets. If the gain is set too high, the image might be cluttered with background noise.
Radar | NSS evo3S Operator Manual
Radar overlay on a chart
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