Onwa Marine Electronics KR-1338C v.1 - Manual (Page 66)

Adjusting MBS (Main Ban Suppression)(Adjustment: 0.00~0.25)
Main bang (black hole), which appears at the display center on short ranges, can
be suppressed as follows.
1. Transmit on long range about 10 minutes.
2. Adjust the gain to show a small amount of noise on the display.
3. Change to the 0.125 nautical mile range and adjust the [A/C SEA] control.
4. Select
"11.MBS adjustment" on the installation setup menu.
5. Press the [ACQ/ENTER] key. The following message appears.
[MBS Adjustment ]
Set value by omnipad
and press ENTER key
Correction 000
<Press MENU for inst setup>
Figure 6-20 MBS Adjustment message
6. Operate the omnipad to suppress main bang.(Left: low, right, between 0 and 25)
7. Press the [ACQ/ENTER] key.
Setting a blanking area]
When the antenna is installed at a close distance in front of the wheelhouse, the
radar should be set not to transmit within that area. No echoes appear in the bla-
nking areas.
1. Select
"7.Dead Sector".
2. Press the [ENTER] key.
3. Operate the omnipad to enter staring point of area (in figures).
4. Press the [ENTER] key.
5. Operate the omnipad to enter ending point of area (in figures).
6. Press the [ENTER] key,
Area of no
transmission
Figure 6-21 Blank areas where transmission is suspended
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