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5. CUSTOMIZING YOUR UNIT
5-31
Sounder system setup menu description (con’t)
Item Description Settings
TVG
(LF, HF)
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
Echo Offset
(LF, HF)
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. The
default setting for both HF and LF is zero.
-50 - +50
Bottom Level
(LF, HF)
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 LF and HF, 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
KP Pulse Selects source of keying pulse. Internal, External (See
installation manual.)
Smoothing Smooths echoes to present stable display. The higher
the setting the greater the smoothing.
SM1-SM4, OFF
TLL Output Outputs cursor position to external equipment. ON, OFF
STC (HF, LF)
(For ETR-30N only)
Adjusts STC level for the high and low frequencies,
and is useful for suppressing surface noise. The
setting range is 0-10; the higher the setting the
greater the extent or suppression. Setting 10
suppresses noise up to several meters. Turn off the
STC when there is no noise on the screen, otherwise
weak echoes may be missed.
0-10
FREQ. ADJ. (HF, LF)
(For ETR-30N only)
Interference from other acoustic equipment operating
nearby or other electronic equipment on your boat may
show itself on the display. You may suppress these type
of interference by adjusting frequency.
-10 - +10
TARGET ECHO
(For ETR-30N only)
Sets fishing objective. Normal for general fishing,
Surface for detecting surface. Pulse repetition rate is
higher than Normal on the specified transducer.
Normal, Surface
SENSOR SETUP
(soft key)
Offsets speed, depth and water temperature
indications and speed of sound.
See next section for
details.
203


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