Furuno 1824C manual Suppressing Second-trace Echoes, Setting watchman stand-by interval

2. RADAR OPERATION

Note: When the watchman is activated and no guard zone is active, the message “PLEASE SET GUARD ZONE. PUSH ANY KEY TO CONTINUE.” appears. Press any key and then set a guard zone.

2.23.3 Setting watchman stand-by interval

The watchman standby interval, that is, the number of minutes the radar is in standby, can be set to 5, 10 or 20 minutes as follows:

1.Press the MENU key.

2.Press the RADAR DISPLAY SETUP soft key.

3.Select WATCHMAN TIME, then press the EDIT soft key.

WATCHMAN TIME

5minutes

10minutes

20minutes

Watchman time window

4.Select time desired, then press the ENTER soft key.

5.Press the MENU key to close the menu.

2.24 Suppressing 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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