Raytheon Pathfinder 1200 Instruction Manual page 22

The
SEA CLUTTER
control should be always returned to its optimum position after
any temporary alteration.
2.3.4 RAIN CLUTTER Switch
During heavy rain or snow which may clutter the picture, use RAIN CLUTTER to
give better contrast between echoes and the clutter. Under some conditions of sea return,
both
RAIN CLUTTER
and
SEA CLUTTER
will help to clarify the picture. When viewing
large masses of land, coastlines, etc.
RAIN CLUTTER
reduces the background and will
cause promontories to stand out more clearly.
2.3.5 IR Switch
When another ship radar is using the same frequency band as that of your own inter-
ference typically appears arranged in curved spokes as shown in Figure 2-3. The radar
interference is mainly noticeable on longer range scales.
Using the IR switch will eliminate this form of interference as well as any other form
of a synchronous noise.
\
\
\
"-
-,
-,
/
/
/
/
/
/ '
":::-
.............
x
>,
<,
\"
"-
\
\
\
\
\
\
2-6
FIG. 2-3
RADAR INTERFERENCE