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Radar System Engineering

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318 ANTENNAS, SCANNERS, AND STABILIZATION [SEC. 9.25<br />

a minimum amount (about I@ in. in the final installation), thus presenting<br />

a minimum of frontal area. These factors make this installation<br />

aerodynamically superior to those shown in Fig. 9“41 and 938. This<br />

radome is made of Fiberglas laminate in a sandwich construction. Its<br />

electrical transmission exceeds 88 per cent for both parallel and perpendicular<br />

polarizations through an angle-of-incidence range of 0° to 70°.<br />

Figure 9.11 shows a radome covering an end-fire array. This housing<br />

consists of a thin-walled tube of Laminac and cotton duck. In addition<br />

to protecting the antenna, the housing is used to pressurize the antenna.<br />

The largest airborne installation made during the war is in a TBM<br />

airplane (Fig. 940). The radome illustrated, housing the antenna shown<br />

in Fig. 9.12, is almost 9 ft wide, 3; ft deep, and 13 ft long. Notwithstanding<br />

its large size it does not seriously alter the performance of the

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