SBX-4 Integrator Guide
Appendix A-Troubleshooting
Page A9
Symptom
Possible solution
No signal lock
•
Check antenna connections
•
Verify MSK rate is set correctly or
choose Auto MSK rate (100, 200 or
Auto)
•
Verify frequency of transmitting
beacon or choose Auto Frequency
Mode
•
Check MBA-3 antenna
•
Verify SBX-4 antenna port output
voltage (5 VDC)
•
Verify 5 VDC across antenna cable
connector
No response to NMEA
commands and queries
•
Verify baud rate settings of
SBX-4 and terminal device
(SBX-4 default baud rate =
4800 bd)
•
Verify communication parameter
settings (8 data bits - no parity - 1 stop
bit)
•
Check integrity of data cable
connections
•
Verify pin connectivity between
SBX-4 and terminal device
Non-differential GPS
output
•
Verify SBX-4 lock status
•
Verify matched SBX-4 output and
GPS RTCM input baud rates
•
Verify GPS receiver RTCM
compatibility
•
Verify GPS receiver DGPS
configuration
•
Verify pin connectivity between SBX-
4/Evaluation Module and GPS receiver
•
Verify communication parameter
settings (8 data bits - no parity - 1 stop
bit)
•
Verify communication levels of SBX-
4 and GPS receiver are matched
(HCMOS vs RS-232C vs RS-422)
•
Verify data cable connections