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3.5.2 When it is raining or snowing [AUTO-RAIN]
Do not set the rain/snow clutter function to too high a suppression level.
Otherwise, not only echoes from rain/snow but also the targets of ships or
dangerous objects are suppressed, which may disturb the detection.
Set the best suppression level whenever you use the ran/snow clutter suppression
function.
When it rains or snows, echoes (rain clutters) from rain or snow are displayed on the PPI screen.
As a result, the images of echoes from ships or the likes are difficult to observe.
Use of the manual or automatic rain/snow clutter function suppresses rain clutters and makes it
easy to observe targets.
While the automatic rain/snow clutter function is working, the manual rain/snow clutter function
(control) cannot be used.
To select the manual or automatic rain/snow clutter function of this radar, operate the
[AUTO-RAIN] control. When the automatic rain/snow clutter suppression function is ON, "A
RAIN" is displayed on the upper right of the screen.
(a) Switching the rain/snow clutter suppression mode
If manual rain/snow clutter suppression is currently selected, pressing the [AUTO-RAIN]
control key changes to automatic rain/snow clutter suppression. If auto rain/snow clutter
suppression is currently selected, pressing the [AUTO-RAIN] control key changes to manual
rain/snow clutter suppression. The automatic rain/snow clutter suppression mode and
manual rain/snow clutter suppression mode are switched back and forth each time the key
is pressed.
(b) Turning the rain/snow clutter control
If manual rain/snow clutter suppression is currently selected, as the rain/snow clutter control
is turned clockwise, the rain/snow clutter suppression function works more strongly.
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