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15. Navigation Sensors
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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.
Second-trace
echo
Tx repetition
Actual range
False echo
range
Second-trace echo
To reject second-trace echoes:
1. Use the trackball to select the MENU box at the right side of the screen then push the left button.
2. Spin the scrollwheel to select Echo then push the scrollwheel to open the Echo menu.
3. Spin the scrollwheel to select 2nd
Echo Rej then push the scrollwheel.
[Echo]
Go Back
2nd Echo Rej
PM
SART
Tune Initialize
Active functions are checked.
4. Spin the scrollwheel to check (activate) or uncheck (deactivate) 2nd Echo Rej as appropriate then push the
scrollwheel.
5. Echo menu will close automatically.