A parabolic aluminium reflector with shield for sidelobe suppression. The reflector is spray painted. Standard colour is grey RAL7038. The mount is made of hot dip galvanised steel. All screws, nuts and washers are made of stainless steel A4 or hot dip galvanised steel class 8.8. The antenna is supplied with flexible radome. Depending on frequency band the feed is made of brass or hot dip brazed aluminium. Further information is given in data-sheet for actual frequency range.
WEIGHT AND DIMENSIONS.
Dimensions in mm according to figure 1.
INTERFACE:
115 mm column withminimum length 1515 mm.
ALIGNMENT:
Coarse:Azimuth+ 50o (depends on column installation)
Fine: Both planes+5o
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 are 0.3 times the -3 dB beamwidth.
Heavy Duty:Wind speed up to 70 m/s and 25 mm radial ice.
Maximum deflection at 45 m/s are 0.3 times the -3 dB beamwidth
Temperature range:-55 oCto+55 oC
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.
