Furuno FCV-1200L Operator's Manual page 44

RX BAND (High and Low Frequencies)
Sets amplifier bandwidth of high and low frequency Rx amplifier.
When NARROW is selected, the noise suppression is greater however resolution is lower in
shallow water. Normally, set to STD. For more effective resolution, select 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. Pulselength (without MANUAL) automatically changes
with range and shift.
PULSE LENGTH (High and Low Frequencies)
When selecting MANUAL on TX PULSE, this setting (setting range: 0.2 msec – 5.0 msec) is
active. The smaller digit, the greater the detection resolution; the larger digit, the longer the
detection range.
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