Sea Tel 4009-9 BROADBAND-AT-SEA, Руководство по установке

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Site Survey 4009-9 Installation Manual
2-3
to the ship should be properly braced with triangular gussets (see graphic above). Care should
be taken to align the pedestal gussets to the ship’s stiffeners as much as possible. Doublers or
other reinforcing plates should be considered to distribute the forces when under-deck
stiffeners are inadequate.
4. The diameter of the pedestal stanchion shall not be smaller than 100 millimeters (4 inches).
Where the ADE base diameter exceeds 1.5 meters (60 inches), additional stanchions (quantity
greater than 3) should be placed rather than a single large stanchion.
5. Shear and bending should be taken into account in sizing the ADE mounting plate and
associated gussets.
6. Shear and bending must be taken into account when sizing the pedestal to ship connection.
7. All welding should be full penetration welds –V-groove welds with additional fillet welds – with
throats equivalent to the thickness of the thinnest base material.
8. For an ADE mounted greater than 0.6 meters (24 inches) above the ship’s structure, at least one
(1) foot rung should be added. Additional rungs should be added for every 0.3 meter (12 inches)
of pedestal height above the ship’s structure.
9. For an ADE mounted greater than 3 meters (9 feet) above the ship’s structure, a fully enclosing
cage should be included in way of the access ladder, starting 2.3 meters (7 feet) above the ship’s
structure.
2.4. Mounting Height
The higher up you mount the antenna above the pivot point of the ship the higher the tangential acceleration (g-
force) exerted on the antenna will be (see chart below).
When the g-force exerted on the antenna is low, antenna stabilization and overall performance are not affected.
If the g-force exerted on the antenna is high enough (> 1 G), antenna stabilization and overall performance are
affected.
If the g-force exerted on the antenna is excessive (1-2 Gs), the antenna does not maintain stabilization and may be
physically damaged by the g-force.