Gain Control; Anti-Clutter Sea Control - Koden MDC-1840BB Operation Manual

Chapter 5
Basic Operation
Table 5.1 Range vs Transmission Pulse Length(PL)
RANGE(NM) Pulse code
0.125 SP
0.25 SP
0.5 SP
0.75 SP
M1P
1.5 SP
M1P
3 M1P
M2P
6 M1P
M2P
12 M2P
LP
24 LP
48(4KW) LP
64 (6KW) LP
72 (12KW) LP
96 (25KW) LP

5.5.3 Gain control

The GAIN control is used to change the receiver gain. The gain control can be
switched to manual or auto mode by ADJUST/ADJUST MENU. When the equipment
is turned on at first, the gain control will be defaulted to manual mode.
Set the gain control as appropriate to your operational needs. As a standard setting,
turn the GAIN control clockwise to 3/4 of the full excursion. This provides slight noise
speckles on the mid ranges and adequate speckles on the long ranges.
To set the auto gain mode, select AUTO1, AUTO2, or HARBOR by ADJUST/ADJUST
MENU. The receiver gain will be automatically set and the manual gain control will
accordingly become inactive.

5.5.4 Anti-clutter SEA control

The Anti-clutter SEA control is used to reduce the clutter echo appearing around the
center of the screen, which is caused by the echo return from the sea surface. The
effect of the control is highest at the center of the screen and reduces with distance.
5-10
MDC-1840BB/1841BB/1860BB/1810BB/1820BB Series
Pulse Length
(4kW)
0.08 us
0.08 us
0.08 us
0.08 us
0.25 us
0.08 us
0.25 us
0.25 us
0.8 us
0.25 us
0.8 us
0.25 us
0.8 us
0.8 us
0.8 us
Pulse Length
(6/12kW)
0.08 us
0.08 us
0.08 us
0.08 us
0.25 us
0.08 us
0.25 us
0.25 us
0.5 us
0.25 us
0.5 us
0.5 us
1.0 us
1.0 us
1.0 us
- 1.0 us
- 1.0 us
- -
Operation Manual
Pulse Length
(25kW)
0.08 us
0.08 us
0.08 us
0.08 us
0.3 us
0.08 us
0.3 us
0.3 us
0.6 us
0.3 us
0.6 us
0.6 us
1.2 us
1.2 us
1.2 us
1.2 us
1.2 us
1.2 us
0093142122-10