Suppressing Second-Trace Echoes - Furuno 1823C Operator's Manual

2. RADAR OPERATION
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.
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.
2-32
Tx repetition
Actual range
Second-trace echoes
Second-trace
echo
False echo
range