Sonic SCS-60, Руководство по эксплуатации

Страница: 47 / 94

5-15
5.3.13 TM/RM
(1) RM/HU
In this mode, the bow of the ship always points to the top of the screen. The
position of the ship is fixed at the center of the screen. The reflected image of fish
schools moves around on the screen relative to the movement of the ship. Normally,
the system is operated using these settings for finding a fish school.
(2) RM/NU
In this mode, the top of the screen always points north. The ship is fixed at the
center of the screen, and the mark representing the ship turns as the ship changes
its course. The reflected image of fish schools moves around on the screen relative
to the movement of the ship.
(3) TM/CU
In this mode, the top of the screen always points north. The reflected images of the
ship and fish schools move around on the screen in accordance with their
movements. This mode is used to observe the movements of the ship and fish
schools. When the ship goes out of screen, the screen automatically changes so
that the ship is displayed at the center of the screen once again.
Information on the ship speed and bearings is required in order to observe these
movements.
When this mode is active, the off-center mode is invalid.
5.3.14 DISCRIM
You can set
“DISCRIM to select the desired mode for the signal processing of the
sonar images.
There are 10 types of settings: "DISCRIM 1 to 10.
” Signal processing is stronger in the
order from "DISCRIM
1” to "DISCRIM 10.” You may select the setting in accordance
with the type of fish and your preference.
5.3.15 PP FILTER
“PP FILTER” is used to eliminate acoustic noise from other ships, random noise,
and/or sea clutter generated during bad sea conditions.
There are 10 types of settings: "PPF 1 to 10." The filter level is stronger in the order
from "PPF 1" to "PPF 10," however, a strong PP FILTER setting may eliminate any
small fish school. It is recommended to set the filter value so that the minimum level of
noise can be eliminated.