Furuno 1824C-BB Operator's Manual page 188

Sounder system setup menu description (con't from previous page)
Item
STC (HF, LF) Adjusts STC level for the high and low
frequencies, and is useful for
(For ETR-30N
suppressing surface noise. The
only)
setting range is 0-10; the higher the
setting the greater the extent of
suppression. Setting 10 suppresses
noise up to several meters. Turn off
the STC when there is no noise on the
screen, otherwise weak echoes may
be missed.
FREQ. ADJ. Interference from other acoustic
(HF, LF) (For equipment operating nearby or other
ETR-30N electronic equipment on your boat
only) may show itself on the display. You
may suppress these type of
interference by adjusting frequency.
TARGET Sets fishing objective.
ECHO
Normal for general fishing, Surface for
(For ETR-30N detecting surface. Pulse repetition
only) rate is higher than NORMAL on the
specified transducer.
B: SENSOR Offsets speed, depth and water
SETUP temperature indications and speed of
soft key sound.
(See next
page.)
Description
7. CUSTOMIZING YOUR UNIT
Settings
0-10
-10 - +10 %
Normal, Surface
See next section for details.
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