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2. MENU OPERATION
2-9
STC (High and Low Frequencies)
Adjusts STC level for the high and low frequencies, and is useful for suppressing
surface noise. The setting range is 0 (OFF) to 10. “10” suppresses noise which
is up to 5 m distance from the face of the transducer. Turn off the STC when
there is no noise on the screen, otherwise weak echoes may be missed.
GAIN ADJ (High and Low Frequencies)
Adjusts gain of receiver unit chosen. Adjust the setting when the GAIN control
cannot effectively adjust the gain.
RX BAND (High and Low Frequencies)
Sets amplifier bandwidth of high and low frequency Rx amplifier. When
NARROW is chosen, the noise suppression is greater however resolution in
shallow water is lower. Normally, set to STD. For increased resolution, choose
WIDE.
TX PULSE (High and Low Frequencies)
Sets TX pulselength for high and low frequencies. The available choices are
SHORT1, SHORT2, STD, LONG, and MANUAL. Pulselengths except MANUAL
automatically change with range and shift.
PULSE LENGTH (High and Low Frequencies)
Sets pulselength, and is effective when TX PULSE setting is MANUAL. Choose
a low value for better detection resolution: a high value to increase detection
range.