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2. RADAR OPERATION
2-5
5. When the radar source is the Model 1800-BB/1900-BB series, sea clutter
and rain clutter can be automatically rejected. Press the D: A/C AT ON/OFF
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 E: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
precipitation clutter (rain, snow, hail, etc.) in the same manner as normal targets.
Precipitation clutter shows as random dots on the screen.
Adjusting the A/C RAIN
When echoes from precipitation mask solid targets, adjust the A/C RAIN to split
up these unwanted echoes into a speckled pattern, making recognition of solid
targets easier.
1. Press the [GAIN] key.
2. Press the C:A/C RAIN soft key to show the A/C RAIN window.
A/C RAIN
0
A/C RAIN setting window
3. Rotate the [ENTER] knob to adjust the A/C RAIN. 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 – weak echoes may be missed.
4. Press the [GAIN] key on the front panel or E:RETURN soft key to finish.
Adjusting the FTC (When the radar source is the M1700 series radar)
To suppress rain clutter from heavy storms or scattered rain clutter, adjust the
FTC.
In addition to reducing clutter, the FTC can be used in fine weather to clarify the
picture when navigating in confined waters. However, with the circuit active the
receiver is less sensitive. Therefore, turn off the FTC, by setting it for “0”, when
its function is not required.
1. Press the [GAIN] key.
2. Press the D:FTC soft key to show the FTC window.
3. Rotate the [ENTER] knob to adjust. The range of adjustment is 0-100. Do not
overadjust the FTC – weak target echoes may be missed.
4. Press the [GAIN] key on the front panel or E:RETURN soft key to finish.
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