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5-2
5.1.1 COM1 menu description
TX POWER: Selects transmitter output power to maximum or minimum. The default setting is
"maximum." For further details see page 2-12.
PULSELENGTH: Selects pulselength to short or long (default setting). For details see
paragraph 2.11.2 on page 2-13.
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, select 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, select EXT.
INT REJECT: Turns the interference rejector on or off (default setting). For details, see
paragraph 3.11.2 on page 3-11.
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 of the external loudspeaker (option).