Furuno 1823C manual Suppressing Second-trace Echoes, Second-trace echoes

2. RADAR OPERATION

2.24Suppressing Second-trace Echoes

In certain situations, echoes from very distance targets may appear as false echoes (second-trace echoes) on the screen. This occurs when the return echo is received one transmission cycle later, or after a next radar pulse has been transmitted.

Tx repetition

Second-trace echo

False echo range

Actual range

Second-trace echoes

To activate or deactivate the second-trace echo rejector do the following:

1.Press the [MENU] key.

2.Press the RADAR DISPLAY SETUP soft key.

3.Use the trackball to select 2ND ECHO REJECTION, then press the EDIT soft key.

4.Choose ON or OFF as appropriate, then press the ENTER soft key.

5.Press the [MENU] key to close the menu.

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