Suppressing Interference; Suppressing Low Level Noise - Furuno CSH-5L Operator's Manual

4. ECHOSOUNDER
4.5

Suppressing Interference

Interference from other sounders or electrical interference shows itself on the
screen as in the illustration below.
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.
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. CLUTTER is locked so use the [GAIN] control to choose YES and then press
the [EVENT] key.
6. 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.)
7. Press the [MENU] key to close the menu.
4-4
Interference
Clutter