Suppressing Second-Trace Echoes - Furuno FA Manual

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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 reject second-trace echoes:
1. Roll the trackball to choose the MENU box at the right side of the screen and
then push the left button.
2. Roll the wheel to choose 1 ECHO and then push the wheel or the left button
to open the ECHO menu.
3. Roll the wheel to choose 2 2
left button.
4. Roll the wheel to choose OFF or ON as appropriate and then push the wheel
or the left button.
5. Push the right button twice to close the menu.
Tx repetition
Actual range
Second-trace echoes
[ECHO]
1 BACK
ND
2 2 ECHO REJ
OFF/ON
3 TUNE INITIALIZE
4 PM
OFF/ON
5 SART
OFF/ON
6 WIPER
OFF/1/2
ECHO menu
ND
Second-trace
echo
False echo
range
ECHO REJ and then push the wheel or the
1. RADAR OPERATION
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