Table 4: Troubleshooting Radar Interference - NorthStar 961 Install Manual

Symptom
961/962 Control Head
The display is either knocked out completely, or
flashes after the radar is turned on (a white flash
corresponds to each revolution of the radar, when
the radar range is set to 6 nm or above).
961/962 Processor
The display is either knocked out completely, or
the screen flashes after the radar is turned on (a
white flash corresponds to each revolution of the
radar, when the radar range is set to 6 nm or
above).
961/962 INSTALLATION MANUAL Revision A

Table 4: Troubleshooting radar interference

Possible Solutions/Reasons
•
Stand directly in front of the display screen to
determine if the problem is related to interference to
the control head.
•
Put the radar into "standby" mode; if the display still
flashes, a non-radar type of interference is occurring.
• Call the Northstar Service Department to determine if
the necessary internal radar shielding has been
installed. If yes, ensure that the 961/962 head (and
processor) aren't in the direct path of the radar
aperture.
•
Ensure that there's maximum separation between the
control head/processor and the radar cables.
Whenever possible, run the radar cables and the 961/
962 cables on opposite sides of the vessel.
•
Stand directly in front of the processor to determine if
the problem is related to interference to the processor.
• Be sure that the processor is mounted as far away
vertically from the radome. The best location for the
processor is out of the weather, so try to mount it in the
salon or as low as possible.
•
Determine if the processor has the RF-125 shielding
modification installed (if you need assistance, call the
Northstar Service Department).
SECTION TWO - Installation
Page 41