Furuno COLOR VIDEO PLOTTER 1933C - Manual (Page 200)

5. CUSTOMIZING YOUR UNIT
5-29
Sounder system setup menu description (con’t from previous page)
Item Description Settings
Default
Setting
TVG
(50 kHz, 200
kHz) TVG (Time Varied Gain)
compensates 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. 0-9
3 (both 50 kHz
and 200 kHz)
Echo Offset
(50 kHz, 200
kHz) If the on-screen echo level
appears to 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. -50 - +50 0 (both 50 kHz
and 200 kHz)
Bottom Level
(50 kHz,
200 kHz) If the depth indication is unstable
in 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 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. -100 - +100 0 (both 50 kHz
and 200 kHz)
KP Pulse Selects source of keying pulse. Internal, External
(See installation
manual.) Internal
Smoothing Smoothes echoes to present
stable display. The higher the
setting the greater the smoothing. SM1-SM4, OFF SM3
TLL Output Outputs current position to plotter
where it is marked with TLL mark.
Use soft key to output TLL. ON, OFF ON
SENSOR
SETUP
soft key
(See next
page.) Offsets speed, depth and water
temperature indications and speed
of sound. See next section for details.