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2. OPERATIONAL OVERVIEW
Reducing interference
Radar Interference
Radar interference may occur when near another shipbome radar operating in the same
frequency band. Its on-screen appearance is many bright dots either scattered at random or
in the form of dotted lines extending from the center (or the edge) to the edge (or the center)
of the display. Figure 2-12 illustrates interference in die form of curved spokes. Interference
effects are distinguishable from normal echoes because they do not appear in the same place
on successive rotations of the scanner.
To reduce this type of interference, press the
MENU
touchpad and select "2. TREJECT' by
operating the trackball. Then, select "ON" by pressing the
RANGE
touchpad. (Factoiy setting
is "ON".) The indication TR" appears at the upper right-hand side of the screen. Press the
MENU
touchpad again to erase the menu display.
We recommend you to use the radar with "IR" tumed on to maintain clear picture.
r
IR Indication
'"'"'-OR
'
■
N
✓
/
\
N
/
/
^
c=0
/I
■/
'I
•
K'i
i
i
i_I
/■
r
j
'
(A) Radar interference,
(B) IR
Circuit
ON,
IR
Circuit
OFF
interference
reduced
Figure 2-12 Effect of Radar Interference Rejection Circuit
2-14
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Troubleshooting
