apertures (frequency and mode dependencies), grounding circuit configurations, and aperture-circuit impedance relationships. In the electro-optical area, the greatest imaging degradation because of illuminating high intensity microwave fields occurs with orthicon and similar multiplier type tubes. Spectrum spreading would provide the greatest improvement in noise and associated spatial responses since normal shielding and filtering could be employed. An additional aspect of the SPS functional impact on EO systems concerns the infrared emission and spectral reflection properties of the orbiting power system satellites. Performance effects on astronomy and space tracking systems because of these "interferences” will be developed. For these systems, the total interference environment will include microwave power coupling and the cited emission and reflection sources. If the initial electromagnetic compatibility analyses for these modulated formats indicates a significant reduction in induced degradation for the higher priority CONUS system categories with an emission bandwidth not in excess of the existing ISM band, the requirements for satellite transmission components will be submitted to NASA-Systems Definition to support a design trade-off study. 4.1.6 Preliminary Assessment Candidate rectenna sites were identified by a previous NASA study (Ref. 4.1.4). Subsequent coordination with the NASA/MSFC Advanced Planning Office indicated an active study emphasizing the Mojave rectenna site. The initial EMC analysis exercise addressed this site so as to provide electromagnetic impact data to this site characteristic review, and contribute to the development of site selection criteria for NASA/DOE. Figure 4.6 shows the Mojave site and the surrounding area which Fig. 4.6. Critical Mojave Rectenna Site
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