User's Manual

WLS Installation and Maintenance Manual Installation
Geometrix
®
Wireless Location System 32
Andrew Corporation Proprietary
Status Description
Fix Mode
Automatic/Manual
Num Satellites
(0-12)
Satellite PRNs
PRN Code, which serves as identification of
satellite (0-12).
Time Valid
Indicator of time validity (Yes/No)
UTC Time
Year/Month/Day/Hr/Min/Sec
Timing Flag: UTC/GPS timing information.
UTC Offset: the current integer leap second
offset between GPS and UTC.
According to Time (UTC) = Time (GPS) –
UTC offset.
GPS Time
Time Of Week (TOW): GPS seconds of week
since Sunday at 00:00:00.
Week No: GPS week number, GPS week
Number 0 started on Jan 6th, 1980.
Failure of the GPS test could indicate a GPS antenna, GPS cable or GPS splitter fault, all
external to the WLS, which would require repair. The test could also indicate a fault in the GPS
receiver internal to the WLS, which should be returned for repair.
To verify proper GPS antenna, cable and splitter operation, a sweep test can be performed using
the Garmin GPS-3 Test Set.
GPS frequencies to sweep for are:
• L1 Band frequency: 1575.42 Mhz
• L2 Band frequency: 1227.6 Mhz
For further information, check the GPS Information Web Site:
http://tycho.usno.navy.mil/gpsinfo.html
2.10.7 AOA Calibration Test
The AOA Calibration Test checks the calibration signal power to each input on the internal WLS
BPU. A test signal is generated by the AOA calibration source in the WLS and sent to the AOA
antenna via the calibration cable (Figure 2-13). The signal is received back from the antenna via
the four antenna element cables, through the antenna switch and RFDU.
Figure 2-13 AOA Calibration Test
Calibration
Source
Antenna
Switch
RFDU
WLS
6