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2. MENU OPERATION
2-8
15. Press the [-] or [+] key to set the alarm level.
MIN: Alarm triggered against light-blue or stronger fish echoes.
MID: Alarm triggered against yellow or stronger fish echoes.
MAX: Alarm triggered against red or stronger fish echoes.
16. Rotate the [FUNCTION] switch fully counterclockwise to choose EXIT.
To cancel an alarm, choose OFF at step 6, then rotate the [FUNCTION] switch to
choose EXIT.
Note: When multiple alarms are set, the buzzer sounds against the alarm set
second (or third).
2.4 TX/RX Menu
The TX/RX menu adjusts pulse repetition rate, STC, gain, RX band, TX pulse
and pulselength.
DISP ALM TX/RX E/S SYSTEM
Menu for TX/RX setting.
[-/+]: Change set, [EXIT]: Exit
PRR LEVEL : 20 (0~20,S)
STC : 0 (0~10)
GAIN ADJ : +0
RX BAND : STD
TX PULSE : STD
PULSE LENGTH : 0.2 msec (0.2~5.0)*
STC : 0 (0~10)
GAIN ADJ : +0
RX BAND : STD
TX PULSE : STD
PULSE LENGTH : 0.2 msec (0.2~5.0)*
<High Frequency>
<Low Frequency>
*: The setting is available when
MANUAL is selected at TX PULSE.
TX/RX menu
PRR LEVEL
Changes pulse repetition rate. Normally, the highest rate (20) is used. When in
shallow waters, second reflection echoes may appear between surface and
actual bottom echo. In this case lower the PRR level. The option “S” means the
ship’s speed dependent mode, where the PRR changes automatically with ship’s
speed. (Requires speed input.) For further information about the ship’s speed
dependent mode, see page 1-19.
Note: When using the transducer pair 88F-126H and 28F-24H with the PRR
setting of 20, transmitter power will drop slightly on the LF/HF display
when the range is within 40 m.