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Radar System Engineering

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286 ANTENNAS, SCANNERS, AND STABILIZATION [SEC.912<br />

of a two-phase sine-wave generator whose armature rotates with the<br />

spinning antenna feed.<br />

In order to bring power to the elevation and spin motors and to bring<br />

the elevation and spin data down to the indicator and servo circuits, 48<br />

slip rings are provided concentric with the azimuth axis. The transmission<br />

line is coaxial. It runs from the transmitter up through the hollow<br />

azimuth shaft, in which there is an r-f rotary joint; thence into the hollow<br />

FIG. 9.14.—The AN/TPS.10 height-finding anterm~ mount with a reflector 10 ft high.<br />

elevation shaft, where a second rotary joint is provided; and then into<br />

the reflector at its vertex, where it passes through the hollow shaft of the<br />

sine generator, a high-speed rotary joint, and the hollow shaft of the spin<br />

motor. In order to exclude moisture, the entire line, including the three<br />

rotary joints and the feed, is pressurized to about 5 lb/in. Z The mount,<br />

weighing some 2200 lb, is installed on an elevator in the trailer and so may<br />

be raised for use or lowered into the trailer for stowage.<br />

The AN/TPS-10.—A second antenna mount of interest is that of<br />

AN/TPS-101 (Fig. 9.14), a radar intended for detecting airplanes and<br />

determining their altitude, especially in mountainous terrain. Although<br />

1War Department Technical Nfanual TM 11-1568.

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