Furuno 1943, 1933, 1833 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 and
(50 kHz,	compensates for propagation		200 kHz)
200 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	If the on-screen echo level	-50 - +50	0 (both 50 kHz and
Offset	appears to be too weak or too		200 kHz)
(50 kHz,	strong and the level cannot be
200 kHz)	adjusted satisfactorily with the
	gain control, adjust echo offset
	to compensate for too weak or
	too strong echoes.
Bottom	If the depth indication is	-100 - +100	0 (both 50 kHz and
Level	unstable in automatic operation		200 kHz)
(50 kHz,	or the bottom echo cannot be
200 kHz)	displayed in the darkest tone 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,	Internal
	(See installation manual.)	External
Smoothing	Smoothes echoes to present	SM1-SM4,	SM3
	stable display. The higher the	OFF
	setting the greater the
	smoothing.
TLL Output	Outputs current position to	ON, OFF	ON
	plotter where it is marked with
	TLL mark. Use a soft key to
	output TLL.
SENSOR	Offsets speed, depth, water	See next section for details.
SETUP	temperature indications and
soft key	speed of sound.

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