ANTENNA SYSTEM

CE-1008

TABLE 1-1. TABULATED LIST OF EQUIPMENT SUPPLIED (CONT).

Dimensions (Inches)

Part

Weight

Width

Nomenclature

Number

Qty

(Pounds)

Height

(Dia)

Depth

Ground Rod Assembly

728701

---

(est)

Transmitter

Model 122

(18)

---

(est)

DF Display

728930

8.71

Oscilloscope

Total weight 1700 lbs

(1) ANTENNA SYSTEM (See Figure 5-1) - The Antenna System is housed in a 16-foot inflatable radome on a

type I platform. It is designed for installation on an 80-foot tower or a portable hoisting stand. The Antenna System

consists of a 9-foot fiberglass parabolic reflector fed by a log-periodic dipole feed, an elevation drive assembly with

elevation capabilities of from -18 to +98 degrees, an elevation drive support casting, an elevation drive support

extension, an antenna pedestal with rotation capabilities of ± 300 degrees, two level bubbles, an elevation data cable

assembly, and r-f cable assemblies.

a. The antenna has a very narrow beam width and requires both azimuth and elevation rotation capabilities

in order to scan for, locate and receive r-f radiation from a point, or points, in space. The antenna operates over the

frequency range of from 1 to 12 GHz. The antenna is also provided with an electromechanical linear actuator (beam

broadener) with a motor-driven mechanism which provides remotely selectable actuation of the linear movement of the

feed support shaft relative to the focal point of the reflector. The primary effect of defocusing the feed toward the

reflector from the focal point is to increase the phase error across the reflector, broadening the main lobe by several

degrees and reducing the gain of the antenna. The antenna is capable of any one of four modes of remotely selected

linear polarization: horizontal, vertical, left-hand 45 degrees, or right-hand 45 degrees. Polarization and beam-

broadening is controlled from the remotely-located Antenna Position Control Indicator via cabling to the antenna

pedestal, the elevation data cable assembly, from the antenna pedestal to the elevation drive, and a cable from the

elevation drive to the antenna.

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