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5. CUSTOMIZING YOUR UNIT
5-27
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 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.
-100 - +100
0 (both 50 kHz and
200 kHz)
KP Pulse
Selects source of keying pulse.
(See installation manual.)
Internal,
External
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 a soft key to
output TLL.
ON, OFF ON
SENSOR
SETUP
soft key
Offsets speed, depth, water
temperature indications and
speed of sound.
See next section for details.