Furuno 1833C, 1933C, 1943C manual Sounder system setup menu description con’t from previous, Tvg

5. CUSTOMIZING YOUR UNIT

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

Item	Description	Settings	Default
			Setting
TVG	TVG (Time Varied Gain)	0-9	3 (both 50 kHz
(50 kHz, 200	compensates for propagation		and 200 kHz)
kHz)	attenuation of the ultrasonic
	waves. It does this by equalizing
	echo presentation so that fish
	schools of the same size appear in
	the same density in both shallow
	and deep waters. In addition, it
	reduces surface noise. Note that if
	the TVG level is set too high short
	range echoes may not be
	displayed.
Echo Offset	If the on-screen echo level	-50 - +50	0 (both 50 kHz
(50 kHz, 200	appears to be too weak or too		and 200 kHz)
kHz)	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	-100 - +100	0 (both 50 kHz
(50 kHz,	in automatic operation or the		and 200 kHz)
200 kHz)	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 50
	kHz and 200 kHz, 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	Internal
		(See installation
		manual.)
Smoothing	Smoothes echoes to present	SM1-SM4, OFF	SM3
	stable display. The higher the
	setting the greater the smoothing.
TLL Output	Outputs current position to plotter	ON, OFF	ON
	where it is marked with TLL mark.
	Use soft key to output TLL.
SENSOR	Offsets speed, depth and water	See next section for details.
SETUP	temperature indications and speed
soft key	of sound.
(See next
page.)

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