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2.9 Adjusting the A/C RAIN
Control
(reducing rain clutter)
The vertical beamwidth of the antenna is de-
signed to see surface targets even when the
ship is rolling. However, by this design the
unit will also detect rain clutter (rain, snow,
hail, etc.) in the same manner as normal tar-
gets. Figure 2-3 shows the appearance of rain
clutter on the display.
Adjusting A/C RAIN
When rain clutter masks echoes, adjust the
[A/C RAIN] control. This control splits up
these unwanted echoes into a speckled pat-
tern, marking recognition of solid targets
easier.
Appearance of
rain clutter
A/C RAIN control adjusted;
rain clutter suppressed.
Figure 2-3 Effect of A/C RAIN
Note: In addition to reducing clutter, the [A/C
RAIN] control can be used in fine weather to
clarify the picture when navigating in confined
waters. However, with the circuit activated the
receiver is less sensitive. Therefore, turn off
the circuit when its function is not required.
2.10 Adjusting FTC
To suppress rain clutter from heavy storms
or scattered rain clutter, press the [A/C RAIN]
control ([FTC] switch). The FTC circuit splits
up these unwanted echoes into a speckled
pattern, marking recognition of solid targets
easier. “FTC” appears at the top right-hand
corner of the display when the circuit is turned
on.
Note: In addition to reducing clutter, the FTC
can be used in fine weather to clarify the pic-
ture when navigating in confined waters.
However, with the circuit activated the re-
ceiver is less sensitive. Therefore, turn off the
circuit when its function is not required.
2.11 Tuning the Radar Receiver
The radar receiver is tuned automatically
each time you turn on the power, thus there
is no front panel control for adjustment of the
receiver. To show the automatic tuning cir-
cuit is working, a tuning bar displays tuning
condition.
2.12 Erasing the Heading
Marker
The heading marker may occasionally mask
a target. To view the target, you can tempo-
rarily erase the heading marker by pressing
and holding down the [GAIN (HM OFF)] con-
trol. Release the control to re-display the
markers.
Heading
marker
Figure 2-4 Heading marker