Reducing Precipitation Clutter; Adjusting The A/C Rain - Furuno NAVNET 1722 Operator's Manual

5. When the radar source is the Model 1833/C series radar, A/C SEA and
A/C RAIN can be automatically adjusted. Press the A/C AT soft key to select
ON or OFF as appropriate. When turned on, it overrides A/C SEA and A/C
RAIN settings.
6. Press the [GAIN] key on the front panel or RETURN soft key to finish.
2.6

Reducing Precipitation Clutter

The vertical beamwidth of the antenna is designed to see surface targets even
when the ship is rolling. However, by this design the unit will also detect rain
clutter (rain, snow, hail, etc.) in the same manner as normal targets. Precipitation
clutter shows as random dots on the screen.
2.6.1

Adjusting the A/C RAIN

When echoes from precipitation mask solid targets, adjust the A/C RAIN. This
split up these unwanted echoes into a speckled pattern, making recognition of
solid targets easier.
1. Press the [GAIN] key.
2. Press the A/C RAIN soft key to show the A/C RAIN window.
3. Rotate the [ENTER] knob to adjust the A/C RAIN affect. The current level is
shown on the A/C RAIN level bar in the A/C RAIN window, and the range of
adjustment is 0 to 100. Do not overadjust the A/C RAIN – weak target echoes
may be missed.
4. Press the [GAIN] key on the front panel or RETURN soft key to finish.
A/C RAIN
0
A/C RAIN setting window
2. RADAR OPERATION
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