Bedienungsanleitung Lowrance Broadband 4G Radar (Seite 22 von 36) (Englisch)

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Setup and Con guration | Broadband 3G/4G™ Radar Installation Guide

Adjust bearing alignment...

Adjust the heading marker. This is to align with the heading marker on the screen with the

center line of the vessel, this will compensate for any slight misalignment of the scanner during

installation. Any inaccuracy will be evident when using MARPA or chart overlay.

Point the boat to the end of a head land or peninsula. Adjust the bearing alignment so the

heading line touches the end of the same head land or peninsula.

Adjust local interference reject...

Interference from some onboard sources can interfere with the Broadband radar. One symptom

of this could be a large target on the screen that remains in the same relative bearing even if

the vessel changes direction. Choose from Local interference rejection LOW, MED or HIGH.

Default is LOW.

Adjust antenna height...

Set the radar scanner height. The Radar uses this value to optimize sea clutter performance.

 Note: It is very important to get the antenna height con gured correctly as this will a ect the

sea clutter function. Do not set the height to 0.

Sidelobe suppression...

 Note: This control should only be adjusted by experienced radar users. Target loss in harbour

environments may occur if this control is not adjusted correctly.

Occasionally false target returns can occur

adjacent to strong target returns such as

large ships or container ports.

This occurs because not all of the

transmitted radar energy can be focused

into a single beam by the radar antenna, a

small amount energy is transmitted in other

directions.

This energy is referred to as sidelobe energy

and occurs in all radar systems.

The returns caused by sidelobes tend to

appear as arcs:

When the radar is mounted where there are metallic objects near the radar, sidelobe energy

increases because the beam focus is degraded. The increased sidelobe returns can be eliminated

using the Sidelobe Suppression control in the Radar installation menu.

By default this control is set to Auto, and normally should not need to be adjusted. However

if there is signi cant metallic clutter around the radar, sidelobe suppression may need to be

increased. The control should be adjusted as follows:

1. Set Radar range to between 1/2nm to 1nm and Sidelobe Suppression to Auto

2. Take the vessel to a location where sidelobe returns are likely to be seen. Typically this would

be near a large ship, container port, or metal bridge

3. Traverse the area until the strongest sidelobe returns are seen

4. Change Auto sidelobe suppression to OFF then select and adjust the sidelobe suppression

control until the sidelobe returns are just eliminated. You may need to monitor 5-10 radar

sweeps to be sure they have been eliminated

5. Traverse the area again and readjust if sidelobes returns still occur

6. Exit the installation menu

RADAR_3G_4G_IG_988-10113-003_EN_P.indd 20 2/11/2011 6:09:11 p.m.

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