Furuno GD-1920C-BB, 1954C-BB, 1964C-BB, 1944C-BB manual Sounder system setup menu description, Hf,Lf

7. CUSTOMIZING YOUR UNIT

Sounder system setup menu description

Item	Description	Settings
Fish Alarm	Sets the fish alarm sensitivity; that is,	High: Orange and stronger echoes
Level	the minimum echo strength which will	trigger the alarm.*
	trigger the fish alarms.	Medium: Yellow and stronger echoes
		trigger the alarm.*
		Low: Green and stronger echoes
		trigger the alarm.*
		* = 8-color display
Transmission	Turns TX power on/off.	On, Off
TVG	TVG (Time Varied Gain) compensates	0-9
(HF,LF)	for propagation 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 appears to	-50 - +50
(HF, LF)	be too weak 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	-100 - +100
(HF, LF)	automatic 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	SM1-SM4, OFF
	display. The higher the setting the
	greater the smoothing.
TLL Output	Outputs current position to plotter	ON, OFF
	where it is marked with TLL mark. Use
	soft key to output TLL.
		(Con’t on next page)

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