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Antenna Positioner Tower 2071-2 ETS-Lindgren EMCO
Used Antenna Positioner Tower 2071-2 ETS-Lindgren.
The ETS-Lindgren Model 2070-1, 2070-2 and 2071 antenna towers are portable mast and platform systems designed for use in EMI compliance testing at elevations from one to six meters above the ground level. The mast, carrier, boom, platform, drive belts and guying system are non-conductive and non-magnetic. The antenna carrier is raised and lowered by a fractional horsepower electric motor with a gear reducer and electric brake. The electronics are contained in a shielded enclosure and the unit receives signals via fiber-optic cables. The electric drive unit is located at the base of the tower.
The mast sections of the tower are constructed of square fiberglass tubing for strength, rigidity and weatherability. The mast consists of three or four sections, depending on whether a four or six meter height is desired (refer to assembly instructions.) Mylar rope guy lines are provided for outdoor installations and must be firmly anchored to provide vertical stability. The carrier is made of non-metallic material, primarily nylon and delrin.
The motor system drives the carrier up and down using a polyurethane Kevlar reinforced timing belt. Rollers on the carrier provide friction-free, smooth travel. The motor typically positions the carrier within two centimeters of the desired location. To prevent over-travel in either direction of movement, the mechanical limits can be set with dual knobs located outside the motor cover. Soft limits can be set within the mechanical limits using the Model 2090 Positioning Controller.
ETS-Lindgren’s Model 2070-1, 2070-2 and 2071 antenna towers are identical in their rugged construction, toothed belt drives and important safety features. The units are differentiated by features that configure the carrier and boom.
The Model 2070-1 is manually polarized. The Model 2070-2 and 2071 feature centerline air polarization, which enhances measurement accuracy. In addition, the Model 2071 features ETS-Lindgren’s patented Bore Sight system that provides direct antenna aim onto and EUT during scanning.
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