Introduction – ETS-Lindgren 2075 MiniMast (Archived) User Manual

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MODEL 2075 MINIMAST™

Introduction

REV D – PN 399235

INTRODUCTION

The ETS-Lindgren Model 2075 MiniMast™ is a portable electric
powered mast and platform system designed to be used with the
Model 2090 Positioning Controller for EMI compliance testing.
The MiniMast™ is designed for antenna scanning from 1m to 2m,
with a 2 m mast extension included so that 1m to 4 m scans can be
performed. The mast, carrier, platform, lifting rope and guying
system are non-conductive and non-magnetic. The mast sections of
the tower are constructed of square fiberglass tubing for strength,
rigidity, and weather-ability.

The MiniMast™ features an offset boom which maintains a
constant rotational axis along the centerline, when the antenna is
rotated from horizontal to vertical polarization. A cable guide at
the back end of the boom feeds the coaxial cable to the antenna
while maintaining the appropriate bending radius. The air
polarization feature allows for remote polarization of the antenna
using the Model 2090 Controller or the optional Hand Control
Unit.

The antenna carrier is raised and lowered by a fractional
horsepower electric gear motor with an integral fail-safe electric
brake. The motor and its associated electronics are contained in a
shielded enclosure mounted on the base of the unit. Under control
of the Model 2090 the motor typically positions the carrier within
one centimeter of the desired location. To prevent over travel of
the carrier in either direction of movement, the motor is outfitted
with mechanical limits. The mechanical limits are set using dual
knobs located outside the motor cover. Soft limits can be set within
the travel range provided by the mechanical limits using the Model
2090 Controller.

The motorbase is connected to the Model 2090 Positioning
Controller via a twin fiber-optic cable assembly. This fiber-optic
cable transmits both directional control and position information.
Power to the motorbase is provided locally to the motor through a
three conductor power cable.

Archived 3/18/10