NorthStar 951X Installation Manual - page 44
SECTION TWO - Installing the unit
Page 34
951/952 INSTALLATION MANUAL Revision B
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
.
•
Wait for the satellite configuration to
automatically update, which should
only take a few minutes.
There’s no DGPS indicator on the CHART
screen, and:
BCN UNHEALTHY is displayed.
•
Wait—the transmitter is switching to
another beacon. You can try manually
switching to another transmitter.
INTERFERENCE
Electrical, magnetic, or radio frequency (RF)
energy is interfering with the reliable opera-
tion of the unit, as shown by high levels of
noise on the
DGPS STATUS
screen.
•
Turn off power to each and all of the
vessel’s other instruments and sys-
tems, one at a time, to isolate the
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.
GPS
The unit powers up, but poor GPS SNR
readings are obtained even after running
the unit for several minutes.
•
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.
Table 2: Troubleshooting the installation (continued)
Problem Area
Symptom
Possible Solutions/Reasons