NorthStar 972, Быстрый старт и справочное руководство

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Reference section 6 — Radar
Using the Adjustment keys Reference Manual Revision B
Manual vs. automatic settings
When gain or sea clutter is in manual
mode, the same setting is applied at all
directions from the vessel. In automatic
mode, settings are calculated scan line by
scan line. This provides the advantage that
the settings can be optimized for each
direction. For example, with a breeze, sea
clutter is typically stronger when looking
into the wind that when looking away from
it. The radar can automatically suppress
more sea clutter where it is needed, and
allow more signal to be displayed in areas
with less clutter return.
Advanced settings
Press the following keys to adjust the pulse
length, signal expansion, speed and
position offset.
Pulse
Select
Long
for better penetration through
rain and fog. Select
Short
for better
discrimination of small targets.
Expand
Select
On
to make small echoes appear
larger. Select
Off
for normal operation.
Speed
Select
Normal
for normal antenna rotation
speed (24 r.p.m). Select
Fast
for quicker
rotation (48 r.p.m.)
NOTE
For 4kW Dome radars, you must switch the
radar to Standby mode and then back to
Transmit when this setting is changed.
For all other radars, this feature is only
available on 24VDC systems.
Offset
Select
Center
to position the vessel in the
center of the screen. Select
Look ahead
to
display more area in front of the vessel.
Presets
There are two types of presets — for auto-
matic and for manual settings.
Manual presets
To set the manual presets, first return to
the Image page, described above, and set
Gain and Sea Clutter to
Manual
.
These presets set the minimum value for
the manual settings, so that the manual
adjustment covers the entire useful range
Set the control (for example, gain) to a
mid-range value (such as 30), and then