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1. OPERATIONAL OVERVIEW
1-16
4. Use the [RANGE] control to choose a menu item. The selected item is
highlighted.
Note: Items displayed in red are locked to prevent accidental change of
setting. When any of those items are selected the display shown
below appears, to ask you if you are sure to change the setting. To
change the setting, use the [GAIN] control to choose YES and then
press the [EVENT] key. The items colored in red turn green to show
that they are available for adjustment.
SELECTED MENU IS LOCKED
ARE YOU SURE TO CHANGE? NO YES
PRESS [EVENT] KEY TO EXECUTE
5. Use the [GAIN] control to choose the option desired.
6. To close the menu, press the [MENU] key.
1.6.3 Sonar menu description
Description of sonar menu
Item Description Ref. page
DISPLAY MODE Chooses the display mode among, COMBI-1
(NORM + Audio), NORM (Sonar) and
COMBI-2 (NORM + Echosounder).
1-6
TX OUTPUT Adjusts transmitter power. 2-4
PULSE LENGTH Chooses pulse length. 2-3
TX CYCLE Removes interference caused by other sonars
operating nearby.
2-6
TVG NEAR Adjusts receiving gain within 300 m. 2-1
TVG FAR Adjusts receiver gain beyond 300 m. 2-1
AGC Automatically reduces the receiver gain only
against strong echoes such as the bottom or a
large fish school, to suppress bottom tail.
2-2
2ND AGC Suppresses bottom echo. 2-3
NOISE LIMITER Suppresses unwanted reflections caused by
sediments in water, plankton or ship’s noise.
2-5
COLOR CURVE Adjusts echo presentation color curve against
strong reflections. In setting “1,” for example,
weak to strong signals are averaged and
displayed to obtain a balanced picture. The larger
the setting the better the resolution on weak
signals.
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