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2. RADAR, CHART RADAR OPERATION
2-33
2.24 How to Suppress 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, open the [1 ECHO] menu then set [5 2ND ECHO REJ]
(B type) or [4 2ND ECHO REJ] (IMO and A types) to [ON] then close the menu.
Second-trace
echo
Tx repetition
Actual range
False echo
range