NorthStar 951X Installation Manual page 44

SECTION TWO - Installing the unit
Problem Area
INTERFERENCE
GPS
Page 34
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Table 2: Troubleshooting the installation (continued)
Symptom
There's no DGPS indicator on the CHART
screen, and:
The BEACON RX SELF-TEST AND SOFT-
WARE reads PASSED, and the DGPS
STATUS message reads POOR DOPS
There's no DGPS indicator on the CHART
screen, and:
BCN UNHEALTHY is displayed.
Electrical, magnetic, or radio frequency (RF)
energy is interfering with the reliable opera-
tion of the unit, as shown by high levels of
DGPS STATUS
noise on the
The unit powers up, but poor GPS SNR
readings are obtained even after running
the unit for several minutes.
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Possible Solutions/Reasons
• Wait for the satellite configuration to
automatically update, which should
.
only take a few minutes.
• Wait—the transmitter is switching to
another beacon. You can try manually
switching to another transmitter.
•
Turn off power to each and all of the
vessel's other instruments and sys-
tems, one at a time, to isolate the
screen. source of the interference.
• Attempt to eliminate the noise through
earth grounding or RF filtering tech-
niques as appropriate to the type of
noise encountered.
•
Check that you have the proper
length and type of cable, and that all
connections are clean and secure.
• Verify the quality of the antenna loca-
tion (the antenna should have a clear
view of the sky). For the correct
antenna placement, see Figure 6.
•
See Table 3, "Troubleshooting the
GPS/DGPS antenna installation," on
page 35.
951/952 INSTALLATION MANUAL Revision B