The reflector and the supporting back-structure of the antennas produced by IRTE are made of stainless steel or aluminium, while the pole-mount system and the nuts & bolts kits are made of hot-dipped galvanised steel (CEI specs 7-6 file 239).
The use of materials with minimum oxidation potential difference (< 0.4V) and of special protection coatings are used to avoid galvanic corrosion in all areas critical for the working of the antenna.
The devices for the fine adjusting of the azimuth and the elevation (± 7°) are in hot-dipped galvanised and stainless steel.
Adjacent to the antenna, near the mount system, there is a clamp for earthling of the feeder and the metal parts of the reflector.
All the feeds are pressurizable at 25 KPa (0.25 bar). Upon request, as regards frequencies up to 2.45 GHz not requiring pressurization, foam filled feeders are available.
The antenna is supplied with a pole mount system (ø 115 mm). Antennas bigger than 1.2 m are equipped with wind braces. Details of the dimensions used for the installation purposes are summarized in Tower interface page.
The whole system of 'reflector, supporting back-structure and pole mount' have been carefully designed and dimensioned using a structural finite elements analysis program to obtain necessary reductions of the total weight without reducing the structural strength.
The system can withstand a wind speed of 200 km/h (124 mph) and 2.5 cm (1") of radial ice without any permanent warp and has a maximum deflection of 0.1° with a wind speed of 110 km/h (68 mph). The maximum load at a wind speed of 200 km/h (124 mph) is listed in the weights and wind loads page(pdf file).
The antennas operate in a temperature range -40°C +60°C and satisfy all specifications indicated in the document EIA RS222E. |
