Furuno FCV-1200LM - Manual (Page 33)

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2. Press the [!] or ["] to select HF
•
FREQ ADJ or LF
•
FREQ ADJ whichever is appropriate.
3. Press the [-] or [+] key to set appropriate value in the setting window so that interference
disappears. (The setting range is -10.0% to +10.0%, however the lowest setting available
for the 68 and 200 kHz transducers is -4.5%.)
To adjust interference suppression level finely, go to step 4.
If the interference suppression is sufficient, go to step 7.
4. Press the [!] or ["] key to close the setting window.
5. Press the ["] key to select HF
•
NOISE LIM or LF
•
NOISE LIM whichever is appropriate.
6. Press the [-] or [+] key to select the noise rejection setting in the setting window.
N3 provides the highest level of interference suppression.
OFF N1 N2 N3
Signal level setting window
7. Rotate the [FUNCTION] switch to select EXIT.
Note: Turn the noise limiter off when no interference exists, otherwise weak echoes may be
missed.