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RDL-3000 RAS-Extend M Installation Guidelines
4.3
Survey for GPS Satellites
It is important to conduct a site survey before installing the GPS antenna. A poorly
installed or badly located GPS antenna can cause interference and will not provide the
necessary information for correct operation of the RAS-Extend M system.
Figure 24: Survey: GPS Antenna
The GPS antenna must have a clear view of the sky, preferably to within 10 degrees of
horizon in all directions. The total blockage of the sky due to buildings, mountains, etc.
should be less than 50%. For best availability, the antenna should be installed at the
highest point available at the site. Surrounding obstacles such as trees, buildings, etc
should not exceed a 20 degree elevation angle.
A small handheld GPS device can be used to check coverage. Perform a survey for at
least three to six hours, checking at regular intervals to confirm that a minimum of five
satellites having signal levels above 36 dB (post correlation signal to noise (CNo)) are
always visible.
After installation, the GPS tracking status can be monitored from the system RAS-
Extend M status screen.
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