Lowrance HDS-9 Gen3 Operators Manual US - Page 108
Adjusting the radar image, Gain, Sea clutter, Rain clutter
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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. You can also adjust the image settings from the radar menu. 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. Gain has a manual and an automatic mode. You toggle between automatic and manual mode in the slide bar. Sea clutter Sea clutter is used to filter the effect of random echo returns from waves or rough water near the vessel. When you increase Sea clutter, filtering the on-screen clutter caused by the echoes of waves is reduced. The system includes predefined Sea clutter settings for harbor and offshore conditions, in addition to the manual mode where you can adjust the settings. You select Sea clutter modes from the menu. You can only adjust the Sea clutter value in manual mode. Rain clutter Rain clutter is used to reduce the effect of rain, snow or other weather conditions on the radar image. The value should not be increased too much as this may filter out real targets. 108 Radar | HDS Gen3 Operator Manual