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5. MENU OPERATION
5-2
5.1.1 COM1 menu description
TX POWER: Chooses transmitter output power to maximum or minimum. The default
setting is "maximum." For further details see paragraph 2.12.1.
PULSELENGTH: Chooses pulselength to short or long (default setting). For details see
paragraph 2.12.2.
TX RATE: The Tx rate may be set between 1-10 (default setting: 10) in the case of the
internal transmitter, or an external synchronous signal may be used. The higher the number
the greater the number of transmissions. For operation in shallow waters, choose the Tx
rate which displays the second reflection from the bottom between the sea surface and
bottom. For use of an external video sounder or sonar, choose EXT.
INT REJECT: Turns the interference rejector on (high freq, low freq or both low and high
freq) or off (default setting). When turned on
appears at the top of the screen. Note
that the interference rejector cannot be turned on/off independently for each frequency in
case of the dual-frequency display. For further details about interference rejection, see
paragraph 2.12.5 (horizontal display) and 3.12.2 (vertical scan display).
AGC: Automatically lowers sensitivity against strong echoes such as those from the bottom
and large fish schools to emphasize weak echoes such as those from fish close to the
bottom. The default setting is OFF.
AUDIO LEVEL: Adjusts the audio level (0-10) of the external loudspeaker (option).
Sometimes you may be preoccupied with other tasks and unable to concentrate on
watching the sonar picture. In such cases it would be a good choice to use the audio
function. This function enables you to monitor echoes from fish schools and seabed through
the built-in speaker. After you’ve become accustomed to monitoring fish aurally, you should
be able to detect a fish school from a range longer than you can detect it on the screen. In
addition you may judge whether the fish school is approaching or going away; the tone
becomes higher when the school is approaching and lowers when the school is going away.
Note: If a dual-frequency display is active, the frequency sound from the left-side display*
(for the dual-frequency vertical scan display the top display) is output.
*: Dual-frequency horizontal display, dual-frequency horizontal expansion, dual frequency
echo sounder