A parabolic aluminium reflector that is spray painted. Standard colour is grey RAL7038. The mount and rear structure is made of hot dip galvanised steel. All screws, nuts and washers are made hot dip galvanised steel class 8.8. Depending on frequency band the feed is made of brass or hot dip brazed aluminium.
Weight and Dimension.
Dimensions in mm according to figure 1.
Figure 1: Dimensions
Alignment:
Coarse: Azimuth + 50o (depends on column installation)
Fine: Both planes+ 8o
Environment: Wind
Survival rating without permanent deformation.
Wind speed up to 70 m/s and 25 mm radial ice.
Maximum deflection at 45 m/s is 0.1o.
Temperature range: -55 oC to+55 oC
Atmosphere
The antenna is designed to meet coastal and industrial atmosphere with 100% relative humidity.
Wind load
Wind effect on parabolic antennas and support structures can be separated into two force components and a twisting moment as shown in figure 2.
The side axial and twisting moment forces shown in table 1 are maximum values exerted on the supporting structure. In every case the value is the result of the wind from the most critical direction. All forces are referenced to the antenna mounting column
Figure 2 : Wind effect on parabolic antennas and supporting structure.