Installation Guide
Page 6
15Oct99
Select the antenna position on the basis of the guidelines listed below.
•
Allow for a passage distance of 0.5 meter from the antenna
•
Ensure a non-obscured line of sight with the satellite
•
Do not mount the antenna higher than one half the vessel length
•
Use non-ferrous materials for mounting
•
Keep a safe distance of 1 meter from the compass of the vessel
•
Mount the antenna above the center of gravity of the vessel
•
On steel vessels the antenna should be mounted on the for-aft line of the vessel
•
Mount the antenna at least 1 meter away from any metallic boat structure
The antenna radiates RF signals during a call (the radiated signal is strongest on the focal line
of the antenna and drops off quickly), therefore a safe distance must be observed. Allow a
passage distance of 0.5 meter from the antenna.
If possible, mount the antenna above the center of gravity of the vessel, this reduces the
effects of pitch and yaw on the motion sensors in the antenna. The mounting height of the
antenna above the waterline should be the lowest height that ensures a non-obscured line of
sight to the satellite. If the antenna is mounted in a position too high there is a risk this will
give too high acceleration forces on the antenna during high sea. As a rule of thumb the
antenna should not be mounted higher than one half the length of the vessel above the
waterline.
As part of the tracking system the antenna incorporates a 3D compass (magnetometer). This
compass is prone to disturbances by moveable ferrous masses and the quality of reading is
also affected by nearby ferrous material. It is therefore recommended to use non-ferrous
materials in mounting materials, screws and brackets (stainless steel and aluminium is
recommended) and to keep a distance of 1 meter from ferrous parts. Since the antenna itself
contains ferrous materials and magnets, it is also recommended to keep a magnetic safe
distance of 1 meter to the compass of the vessel.
Ideally, the antenna must have a non-obscured line of sight with the satellite during all roll,
pitch and yaw conditions to accommodate tracking. Due to masts and pipes a non-obscured
line of sight is obviously not possible to obtain for all vessels but applying the following rule
of thumb should ensure stable operation: With a mast that can potentially obscure the view to
the satellite, mount the antenna at least 6 times the diameter of the (obscuring-) mast away
from the mast, e.g. mount the antenna at least 1.5 meter away from a 0.25 meter diameter
mast.
Observe the front back marking on the antenna base to get the roll and pitch reading
correct. If it is more practical to disregard the front/back markings on the antenna base, the
only consequence is that the roll and pitch readings in the handset are not correct, since they
are referred to the markings on the antenna base casting. Referring to the base casting on
the next drawing the front/back line is a vertical line passing through the center of the
antenna.
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Страница 40: ...Getting Started Page 24 15Oct99 ...
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Страница 85: ...Appendix A List of Abbreviations 15Oct99 Page 69 ...
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Страница 104: ...Appendix D 2 Digit Service Codes Page D 2 15Oct99 ...
Страница 106: ...Appendix E Tone Signals Page E 2 15Oct99 ...
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Страница 116: ...Appendix G List of System Errors Page G 2 15Oct99 ...
Страница 118: ...Appendix H Trouble Shooting Page H 2 15Oct99 ...
Страница 120: ...Appendix I Extended Error Codes Page I 2 15Oct99 ...
Страница 129: ...Appendix J Search Algorithms 15Oct99 Page J 9 ...
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Страница 151: ...Appendix L Spot Beam Coverage 15Oct99 Page L 21 Figure Figure 6 6 8 8 Indian Ocean Region Indian Ocean Region ...