Onwa Marine Electronics KR-12X8 - Manual (Page 35)

Fixed time trail
1. When the elapsed time clock counts up to the trail time selected, the elapsed
time display freezes.
2. The oldest portions of trails are erased so only the latest trail, equal in length
to the trail time selected, is shown.
3. Trail continues.
For example, the one minute trail time is selected. When the elapsed time clock
counts up to 60 seconds, the elapsed time clock counts up to 60 seconds, the
elapsed time display freezes at “60,"but the latest one minute of trail are erased
and then trail continuous.
Continuous trail
The maximum continuous trail time is 99 minutes and 59 seconds. When the
elapsed time clock counts up to that time the elapsed time display is reset to zero
and trail begins again.
Cancelling echo trail
Select "OFF(deactivate)" at "ECHO TRAIL" on the menu.
Changing trail attributes
Trail gradation and trail time can be selected on the OTHERS menu.
Item In
OTHERS
menu
Description
Trail Tone
Trails can be shown in single
or multiple gradations.
Multiple paints trails getting
thinner with time just like the
afterglow on an analog PPI
radar.
Single Multiple
Trail Time
Trail time can be set for 15sec,
30sec, 1min, 3min, 6min,
15min, 30min or continuous.
3.5 Suppressing Radar Interference
Radar interference may occur when near another shipborne radar operating in the
same frequency hand as you radar. Its on-sereen appearance is many bright dots
either scattered at random or in the form of dotted lines extending from the center
to the edge of the display. Figure 3-6 illustrates interference in the from of curved
spokes. Interference effects are distinguishable from normal echoes because they
do not appear in the same place on successive rotations of the antenna.
Table 3-1 Trailing attributes
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