Furuno FMD-3100 Operator's Manual page 229

1) [Noise Reject] suppresses white noise.
2) [Video Contrast] adjusts the video dynamic range and curve. Refer to the fig-
ure below for settings and results.
The gain at the center of
the signal strength is low,
suitable for distinguishing
targets from sea and rain
clutters.
The gain at the center of
the signal strength is
high, making it difficult to
distinguish targets from
sea and rain clutters.
3) [STC Curve]: If sea clutter is not sufficiently suppressed with the [A/C Sea]
control on the [RCB Common] page, try to adjust the STC curve. The choices
are 2.5, 3.0, 3.5 and 4.2. The higher the number the greater the STC effect.
4) [STC Antenna Height] sets the antenna height (m) above sea level. The choic-
es are 5, 7.5, 10, 15, 20, 25, 30, 35, 40, 45, and [more 45].
5) If a target appears pushed inward or pushed outward (when it should be
straight), or targets displayed near the center of the screen are not at their cor-
rect distances, adjust [Timing Adjust] to straighten the target.
Note: Improper adjustment causes echoes to be displayed weakly.
Straight target
correctly displayed
1) Transmit the radar and set the chart scale on the ECDIS to 1:4,000.
2) Adjust the gain, sea clutter, etc. to display the radar image properly.
3) Find a target on the ECDIS that should be displayed straightly, like a pier
or jetty.
4) While monitoring the target, enter a figure in [Timing Adjust] that straight-
ens the target.
"Standard" setting
Target pushed Target pushed
inward
16. RADAR OVERLAY
The overall gain is high,
suitable for long range
detection. Difficult to
distinguish targets from
sea and rain clutters.
outward
16-5