ETS-Lindgren 2071B Antenna Positioning Tower (Archived) - Manual (Page 8)

8 | Introduction
Fiber optic limit switches mechanically limit the travel of the carrier. The
upper limit is at a fixed location to stop the carrier at its maximum height. The
lower limit is adjustable to fit test requirements. In addition, the
Model 2090 Series Multi-Device Controller allows programming two upper and
two lower limit settings. For more information on the Model 2090, see page 11.
The Model 2070B/2071B features centerline air polarization, which enhances
measurement accuracy.
See Mounting Antennas on page 42 for information on the types of antenna
mounts accepted by the Model 2070B/2071B.
About Bore Sight
The Model 2071B provides the ETS-Lindgren patented bore sight system to
provide direct antenna aim on Equipment Under Test (EUT) during scanning.
This bore sight meets the requirements of ANSI C63.4 2003 and 2009 for
compliance with FCC measurements above 1 GHz.
During scans, the bore sight system maintains constant directional antenna
positioning while varying the angle between the antenna and the mast. This is
particularly important when using higher gain antennas of more than 3 dBi. As
the antenna is raised above the ground, the tilting of the antenna will maintain the
EUT within the half power (-3 dB) beamwidth.
Archived 06/24/14