A parabolic aluminium reflector that is spray painted. Standard colour is grey RAL7038. The mount is made of extruded aluminium profiles. All screws, nuts and washers are made of stainless steel A4 or hot dip galvanised steel class 8.8. The antenna is prepared for mounting an optional moulded spherical radome. One support stay is included. Further information is given in the installation manual. Depending on frequency band the feed is made of brass or hot dip brazed aluminium.
Weight and Dimensions.
Dimensions in mm according to figure 1.
Weight: 27 kg. (Without radome)
Interface:
115 mm column with minimum length 750 mm. (Not included) Alignment:
Coarse:Azimuth+ 50o (depending on column installation)
Fine: Both planes+15o
Environment:
Wind
Survival without permanent deformation.
Normal Duty:Wind speed up to 55 m/s and 25 mm radial ice.
Maximum deflection at 30 m/s is 0.1 o.
Heavy Duty:Wind speed up to 70 m/s and 25 mm radial ice.
Maximum deflection at 30 m/s is 0.1 o.
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.
