4.5
Iridium Openport Terminal I 4 Installation
ADE Mounting
Bracket and Pole
Once a suitable location for the ADE has been determined it is necessary
to select a mounting bracket and pole. Factors to consider in selecting a
mounting bracket and pole include:
The weight of the unit (11 kg, 24.25 lbs)
The size of the unit (20 mm high and 570 mm diameter)
Resonance
The mounting bracket and pole must be capable of supporting the
weight of the unit. More importantly when selecting a suitable mounting
pole the limiting factor is resonance, not strength. Aerodynamic forces in
the range 0 – 10 Hz for wind speeds up to 60 mph (storm force 10) will
cause the ADE to vibrate.
Depending on wind conditions, certain pole diameters and lengths will
have a natural tendency to vibrate. Minimize the potential for vibration,
and damage to the unit assembly, by carefully choosing a pole diameter
and length that can sustain the expected weather conditions the vessel is
likely to encounter. To avoid resonance the following guidelines are
recommended:
Minimum pole diameter: D = 60. mm (2.8 in.)
Minimum wall thickness: t = .2 mm (.125 in.)
Resonance
For 100 mph winds (hurricane force 12) the unsupported length should be
reduced to 1.0 m (. ft.). Longer poles are possible if additional support is
provided such as guy ropes.
•
•
•
•
•
•
2.0 m (6.6 ft.) max.
unsupported height
60. mm (2.8 in.)
min. pole diameter
.2 mm (.125 in.) min.
wall thickness
Figure 4 I 2
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