NorthStar Navigation 8000I - Manual (Page 73)

73 Northstar 8000i Black Box Processor
10.15.2 Change the radar startup mode
To change the radar startup mode:
1. Select Display .
2. Select Setup from the control panel.
3. Select + Radar to show a list of radar specification options.
4. Select Radar Power on Action , then select:
ƒ
Standby if you want the scanner to warm up and then remain in Standby mode
when the 8000i starts up. This is the default. The warm up can take 90 - 180
seconds, and an open array will rotate to face the bow.
ƒ
Remain Off if you want the scanner to remain Off when the 8000i starts up. This
saves on power consumption and magnetron usage.
5. When you are finished, select – Radar .
10.15.3 Change the radar range offset (trigger delay)
The radar range offset is also known as the trigger delay.
Ideally, the radar sweep should commence at your vessel (a radar range of zero). You may
need to adjust the radar range offset to achieve this.
Symptoms that occur when this is set incorrectly are a large dark circle in the center of the
sweep or you may notice straight objects such as a straight sea wall or jetty having a curve or
indentation. Similarly, objects close to your vessel may appear “pulled in” or “pushed out”. To
rectify this adjust the radar range offset (trigger delay)
The best way to perform this procedure is to position the vessel about 50 yards to 100 yards
(45 m to 90 m) from a straight-walled jetty or similar feature that produces a straight line
echo on the display.
Select the 1/8 mile range
Adjust the gain setting until a reasonably good image of the jetty echo is displayed.
Adjust the radar range offset to make the jetty echo appear as a straight line on the
display, as shown:
If it‘s not possible to position the vessel near a suitable target, perform a rough set up of the
range offset by using the circle at the center of the radar screen as a guide.
If your Radar screen has:
• a wide black circle around the center, decrease the radar range offset until it almost
disappears.
• no black circle at the center, increase the radar range offset until a black circle just
starts to appear at the center.