Furuno 1823C manual Sounder system setup menu description con’t from previous, SM1-SM4, OFF

5. CUSTOMIZING YOUR UNIT

Sounder system setup menu description (con’t from previous page)

Item	Description	Settings
Echo Offset	If the on-screen echo level appears to be too weak	-50 - +50
(HF, LF)	or too strong and the level cannot be adjusted
	satisfactorily with the gain control, adjust echo
	offset to compensate for too weak or too strong
	echoes.
Bottom Level	If the depth indication is unstable in automatic	-100 - +100
(HF, LF)	operation or the bottom echo cannot be displayed
	in reddish-brown by adjusting the gain control in
	manual operation, you may adjust the bottom echo
	level detection circuit, for both HF and LF, to
	stabilize the indication. Note that if the level is set
	too low weak echoes may be missed and if set too
	high the depth indication will not be displayed.
KP Pulse	Selects source of keying pulse.	Internal, External (See
		installation manual.)
Smoothing	Smoothes echoes to present stable display. The	SM1-SM4, OFF
	higher the setting the greater the smoothing.
TLL Output	Outputs current position to plotter where it is	ON, OFF
	marked with TLL mark. Use soft key to output TLL.
STC (HF, LF)	Adjusts STC level for the high and low frequencies,	0-10
(For ETR-30N	and is useful for 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 equipment	-10 - +10 %
(HF, LF) (For	operating nearby or other electronic equipment on
ETR-30N only)	your boat may show itself on the display. You may
	suppress these type of interference by adjusting
	frequency.
TARGET	Sets fishing objective.	Normal, Surface
ECHO	Normal for general fishing, Surface for detecting
(For ETR-30N	surface. Pulse repetition rate is higher than
only)	NORMAL on the specified transducer.
SENSOR		See next section for details.
SETUP	Offsets speed, depth and water temperature
soft key
	indications and speed of sound.
(See next
page.)

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