Andrew operation and maintenance Specifications download pdf (Page 8)

Chapter 1 - General Information

42S315F 1-2

The Series 8009A antenna mounts provide two-axis (elevation-over-azimuth)

adjustment for pointing the antenna. In the elevation-over-azimuth

configuration, the antenna rotates about two axes, a vertical azimuth axis and

a horizontal elevation axis. Pointing to a geostationary satellite requires that

the antenna be moved to a specific angle about the azimuth axis, then to a

specific angle about the elevation axis. The required sighting angles for any

satellite are given in look-up tables which are readily available.

Figure 1-1. Typical Antenna System

The Model 8009A mount consists of a 168 inch [426 cm] tall structural tube

that is supported at the top by two legs which extend to the rear of the

antenna. The bottom of the tube is supported by a pivot bearing and is driven

at the ground level location by the azimuth actuator. The elevation actuator is

located atop the structural tube and behind the reflector hub. Both a single

speed and a variable speed motorized actuator option is available. The total

azimuth coverage is 160° in three overlapping 120° continuous sectors.

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Andrew operation and maintenance Specifications Page 8