Japan Radio Co. JMR-611, Instruction Manual, Page: 67 / 188

3.4 BASIC OPERATIONS
y
yy
3-13
3
3.4.7 Rain/Snow Clutter Suppression[RAIN]
When using the [SEA] function, never set the suppression level too high
canceling out all image noises from the sea surface at close range.
Detection of not only echoes from waves but also targets such as other ships
or dangerous objects will become inhibited.
When using the [SEA] function, make sure to choose the most appropriate
image noise suppression level.
Procedures 1 Adjust the rain/snow clutter returns of the display by turning the
[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 the [RAIN] dial control 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 on the radar 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.
3.4.8 Interference Rejection [IR]
Interference by other radars is rejected.
z When viewing a radar beacon or SART signal, select
IR Off (Interference Rejection Off) because IR
processing suppresses the video.
Attention