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2. RADAR OPERATION
2-24
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 A: RADAR DISPLAY SETUP soft key.
3. Select WATCHMAN TIME, then press the A: EDIT soft key.
WATCHMANTIME

5minutes
10minutes
20minutes
Watchman window
4. Select time desired, then press the C: 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.
Second-trace
echo
Tx repetition
Actual range
False echo
range
Second-trace echoes
To activate or deactivate the second-trace echo rejector do the following:
1. Press the MENU key.
2. Press the A: RADAR DISPLAY SETUP soft key.
3. Use the Trackball to select 2ND ECHO REJECTION, then press the A: EDIT soft key.
4. Choose ON or OFF as appropriate, then press the C: ENTER soft key.
5. Press the MENU key to close the menu.
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