Astrophysics. Part B: Radio Telescopes by M. L. Meeks

By M. L. Meeks

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5-min peak winds in the United States. Isopleths of 1 per cent of 25-year maximum 5-min wind in mph at height of 50 ft above ground. indicate that, as the antenna size increases, the design wind speed must also be increased significantly if operation is to be maintained for a large fraction of the total time. For example, an antenna 50 ft above the ground designed to function in a 30-mph wind could be operable except for about 3 per cent of the time, whereas winds at a height of 40 0 ft will exceed 30 mph about 30 per cent of the time.

Weiss Table 2. ). 093 in. 031 in. 0971 in. with a single compensator in each of the eight upper and eight lower trusses, it has been possible to maintain an "invariant" parabolic contour to within the tolerance budget shown in Table 2. The compensation will most likely be achieved by appropriate coupling of the counterweight to the truss structure. Electromagnetic Considerations Because of the desire to operate the antenna over a wide spectral range (5100 cm) with high effiCiency, it has been decided to employ both prime focus and Gregorian feed systems.

FEET � • o AND DRIVE Figure 12. four-pad bearing system. and temperature gradients will also be needed if a radome is used. It is just not feasible to build very high precision large antennas at low cost unless mate­ rials such as steel, aluminum, or fiberglass are used; and since these materials have thermal coefficient of expansion of about 1 part in 100,000 per OF precisions higher than about 1 part in 30,000 are difficult to maintain unless the structure is in a very stable thermal environment.

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