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4. ECHOSOUNDER MODE
4-4
4.5 Suppressing Interference
Interference from other sounders or electrical interference shows itself on the screen
as in the illustration below.
Interference
To remove interference, do the following:
1. Press the MENU key to open the menu.
2. Use the RANGE control to choose [MENU MODE] at the top of the screen.
3. Use the GAIN control to choose [SOUNDER].
4. Use the RANGE control to choose [E/S INT REJECT].
5. Use the GAIN control to choose [ON]. (If no interference exists, choose [OFF].)
6. Press the MENU key to close the menu.
4.6 Suppressing Low Level Noise
Low level noise, often caused by sediments in water, is painted on the screen as a
large number of light-blue dots. These echoes may be suppressed as below.
Clutter
1. Press the MENU key to open the menu.
2. Use the RANGE control to choose [MENU MODE] at the top of the screen.
3. Use the GAIN control to choose [SOUNDER].
4. Use the RANGE control to choose [CLUTTER].
5. Use the GAIN control to choose setting. (The setting range is 0.0-10.0 and the
higher the number the stronger the echo that will be erased.)
6. Press the MENU key to close the menu.
Interference from
other sounders
Inteference from
electrical equipment