probably would not pose great problems for the space station itself, provide windows and other unshielded areas are not in the beam peak regions. The figure also shows the dispersed beam pattern which would result if the 80 subarrays lost their phasing control signals. In addition to grating lobe exposure concerns, a further limit on allowable antenna tilt arises from the increased losses in power collected in the mainbeam. The rectenna collection efficiency falloff and grating lobe magnitudes increase with tilt are shown in Fig. 16 for the 5.8 GHz configuration (A). Antenna tilts greater than 10 arcminutes cause a steep rise in grating lobe magnitudes and an increasingly severe efficiency degradation. An antenna with 30 arcminutes tilt allows only 76% of transmitted power to be collected. Antennas for nuclear reactor transmission should therefore maintain physical alignment to within a tolerance of approximately 10 arcminutes. CABLES The simplest method to transfer power between the satellite and the space station is over a conducting cable. The power cable could probably also be used as the tether
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