[max] 5.070899963378906e+01
[min] 3.785400009155273e+01
[OK] 2016-01-06T19:05:02Z
Q12: Why is my SyncSystem 4380A not tracking the GNSS satellite signals?
A12: There are several reasons why the 4380A may have trouble with properly tracking the
GNSS satellite signals. Microsemi recommends that you begin the trouble shooting process by
asking yourself the following questions:
• Are you using the GNSS antenna that was provided with the unit?
The GNSS antenna (NovAtel GPS-704-WB) that is provided with the 4380A ensures
optimal performance. Microsemi strongly recommends use of this dual frequency band
(L1 & L2) antenna with the 4380A.
• Has the GNSS antenna voltage been properly set?
Many high performance GNSS antennas must be powered externally. Typical operating
voltages include 5 VDC and 12 VDC. The 4380A is capable of providing antenna power
(0, 5, 12 VDC) by DC biasing the antenna cable, but this can cause damage to an antenna
if the wrong voltage is applied. Prior to connecting an antenna to the unit, ensure the
antenna voltage is set properly. The 4380A is shipped from the factory with the default
antenna voltage of 0 volts.
• Has the antenna cable failed?
Ensure the cable has continuity end to end. If a DC bias voltage is being applied to the
antenna, measure the center pin to the shield at the antenna and make sure that the
bias voltage is present.
• Is the GNSS antenna located outside where it has an unobstructed view of the sky?
Make sure that there are no obstructions between the GNSS antenna and the sky. If
you are inside a building, surrounded by tall buildings, or in a tunnel, the GNSS antenna
will not have a clear view of the sky. The GNSS receiver requires signals from at least
four satellites, and even partial obstructions can prevent your GNSS receiver from
functioning properly. The Sync LED on the front panel will start flashing red if the 4380A
is not tracking at least four GNSS satellites.
• Is the GNSS antenna mask angle set correctly?
Ensure the mask angle is not set too low or too high. If set too low, the receiver might
not be able to track the satellites because of obstructions. If set too high, the receiver
will not be able to use all of the available satellites to determine a fix and the correct
time. Ensure the mask angle is correct using the settings gps:mask_angle command.
Default = 10 degrees.
• Are you using the correct positioning datum?
© 2016 Microsemi Corporation. All rights reserved. SyncSystem 4380A FAQs Version 1.0 (22 Feb 2016)
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