198 E-Series Networked Display Reference Manual
Gain
The gain control makes the radar picture clearer by changing the sensitivity of radar
reception.
• For long ranges - select a sensitivity level that gives a slight speckle in the back-
ground. Be careful not to set the gain too low, or you may miss weak or small tar-
gets.
• For shorter ranges - reduce the gain slightly to reduce the speckle and therefore
improve target definition.
Note:
If the gain settings are manually changed you should re-check it every time
you change the range scale.
Color Gain
The Color Gain control adjusts the intensity (color) of displayed targets, but does not
significantly adjust the number of targets displayed.
Increasing the color Gain will cause more targets to be displayed in the same color.
This may avoid some confusion as to whether a return on the screen is a target or
background noise.
Reducing the color gain may give better target detail, target discrimination and
target detection within clutter.
Rain clutter
Radar detects echoes from rain or snow. The strength of these echoes depends upon
the altitude, range, density and size of the snow flakes or rain droplets and appear
on screen as countless small echoes continuously changing size, intensity and
position.
Turning the RAIN clutter function on suppresses the bulk effect of rain returns from
around your boat, so that recognizing other objects is easier. Once Rain clutter is set
to ON use the rotary control to fine tune the rain clutter control.
Sea clutter
Radar echoes from waves around your boat can clutter the centre of the radar
picture, making it difficult to detect real targets (see
page 187
).
Adjusting the sea mode will reduce this clutter for up to 5 nautical miles (depending
on wave and sea conditions) from your boat. This reduces sea echoes to intermittent
small dots, while small targets remain visible and persistent. Gain levels further from
your boat remain unchanged. T
he sea clutter curve under Scanner Set up will effect the
effectiveness of this control (
see Sea clutter curve
on
page 185)
.
81244_4.book Page 198 Thursday, January 31, 2008 1:53 PM
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