JMA-9172-SA Instruction Manual > 3.BASIC OPERATION > 3.2 OBSERVE AND ADJUST VIDEO
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3.2.6 Suppress Rain/Snow Clutter [RAIN]
See also the Section 3.2.8 "To get the appropriate image that targets can be easily
observed".
3.2.6.1 Using the manual rain / snow clutter suppression mode
1) Adjust the rain / snow clutter returns of the display by turning the
[AUTO-RAIN] dial until targets can be easily observed.
Turning [RAIN] dial clockwise suppresses rain / snow clutter returns.
Turning [RAIN] dial counterclockwise intensifies rain / snow clutter returns.
When using the rain clutter suppression function,
never set the suppression level too high canceling out
all image noises from the rain or snow at the close
range.
Detection of not only echoes from the rain or snow but
also targets such as other ships or dangerous objects
will become inhibited.
When using the [AUTO RAIN] function, make sure to
choose the most appropriate image noise suppression
level.
When the [RAIN] dial is turned clockwise, the rain / snow clutter
suppression function suppresses rain / snow clutter returns and gets
targets hidden by rain / snow clutter returns to appear of the display.
However, be careful that excessive suppression may cause small
targets to be overlooked. Since the rain / snow clutter suppression
function also has the effect of suppressing sea clutter, the suppression
efficiency improves when the [RAIN] dial is used with the [SEA] dial. In
general, turn the [RAIN] dial fully to the left.
It is recommended to restore the setting to
the factory default, if you lost the appropriate
settings.The factory default level is shown on
the bar chart as a green line.
The factory default level is assigned by
every function mode. See the Section 3.9
"USE FUNCTION KEY [USER]"
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