Navico Broadband 4G Installation Manual
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Contents
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20 | Setup and Configuration | Broadband 3G/4G™ Radar Installation GuideAdjust bearing alignment...Adjust the heading marker. This is to align with the heading marker on the screen with thecenter line of the vessel, this will compensate for any slight misalignment of the scanner duringinstallation. 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 theheading 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 symptomof this could be a large target on the screen that remains in the same relative bearing even ifthe 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 configured correctly as this will affect thesea 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 harbourenvironments may occur if this control is not adjusted correctly.Occasionally false target returns can occuradjacent to strong target returns such aslarge ships or container ports.This occurs because not all of thetransmitted radar energy can be focusedinto a single beam by the radar antenna, asmall amount energy is transmitted in otherdirections.This energy is referred to as sidelobe energyand occurs in all radar systems.The returns caused by sidelobes tend toappear as arcs:When the radar is mounted where there are metallic objects near the radar, sidelobe energyincreases because the beam focus is degraded. The increased sidelobe returns can be eliminatedusing 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. Howeverif there is signifi cant metallic clutter around the radar, sidelobe suppression may need to beincreased. The control should be adjusted as follows:1. Set Radar range to between 1/2nm to 1nm and Sidelobe Suppression to Auto2. Take the vessel to a location where sidelobe returns are likely to be seen. Typically this wouldbe near a large ship, container port, or metal bridge3. Traverse the area until the strongest sidelobe returns are seen4. Change Auto sidelobe suppression to OFF then select and adjust the sidelobe suppressioncontrol until the sidelobe returns are just eliminated. You may need to monitor 5-10 radarsweeps to be sure they have been eliminated5. Traverse the area again and readjust if sidelobes returns still occur6. Exit the installation menu!! |
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