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Mechanical Data Ø 1.2 m HP, HXP antennas.  

 

MATERIAL AND TREATMENT

 

A parabolic aluminium reflector with shield for sidelobe suppression. The reflector 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. Radome  have PTFE finish and have low loss and low influence on electrical specifications. Depending on frequency band the feed is made of brass or hot dip brazed aluminium. Further information are given in data-sheet for actual frequency range.

WEIGHT AND DIMENSIONS

 

Dimensions in mm according to figure 1.



ALIGNMENT:

 

         Coarse:    Azimuth  + 50o (depending on column installation)
            Fine :            Both planes  +15o   

  

ENVIROMENT:

 

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 are 0.1 o.
            
            Heavy Duty:     Wind speed up to 70 m/s and 25 mm radial ice.
                                    Maximum deflection at 30 m/s are 0.1 o.

 

Temperature range:  
               -55oC to 55oC                 

 

Atmosphere:

The antenna are 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.

 Table 1 : Wind force

Wind speed

MaximumAxial force  N ( kp)

Maximum Side force   N ( kp)

Maximum Twisting moment Nm (kpm)

55 m/s  (200 km/h)

3089 (315)

1491 (152)

990 (101)

70 m/s  (252 km/h)

4895 (499)

2364 (241)

1569 (160)



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