v100GX – Marine Satellite Communication System
18
Planning the Installation
Selection of Antenna Installation Site
Install the antenna in accordance with the following procedures to insure maximum
performance of the antenna. The ideal antenna site has a clear view of the horizon
or satellite all around. Please be sure there are no obstacles within 15º above the
center of the antenna. Any obstacles can prevent the antenna from transmitting and
receiving the satellite signal.
Do not install the antenna near the radar especially on the same plane as its energy
levels may overload the antenna front-end circuits. It is recommended to position
the antenna at least 4 feet (1.2 m) above or below the level of the radar and minimum
of 15 feet (4.6 m) away from the high power short wave radars.
The mounting platform should be rigid enough and not subjected to excessive
vibration. The movement of the antenna can be minimized by installing at the
center of the vessel. If these conditions can be only partially satised, nd the best
compromised installation site between the various considerations.
Elevation Limit
of Obstacles
Congure Radiation Hazard/Blockage Zones
It is important to set up the radiation hazard or blockage zones for Intellian VSAT
communication systems. The ACU can be programmed with relative azimuth and
elevation sectors to create up to ve zones where transmit power would endanger
personnel who are frequently in that area or blockage exists. Several things happen
when the antenna is within one of these zones.
1. “BLOCK” will be displayed on the ACU screen.
2. Tracking continues as long as the signal level is greater than the predened
threshold value. When the signal level drops below the threshold value the
antenna will wait “Search Wait Time” parameter amount of time and re-target the
satellite you targeted last. The antenna will continue to re-target the satellite until
the satellite is re-acquired and tracking can be resumed.
3. A transmit inhibit output from the ACU will disable/mute the modem transmission.
Antenna Unit Obstacle
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