interference would affect military and civil domains, and directly increase the susceptibility of VHF and sensor equipments because of circuit impedance and coupling aperture factors. Lower frequencies also represent higher ionospheric modification potential. The present system configuration analyses emphasize the single frequency unmodulated mode. Modulation components will result from the noise characteristics of the frequency generation and power generation devices. Typical emission bandwidth displays for the primary, harmonic, and spurious frequencies for traveling-wave and crossed-field amplifiers have been presented in another section. As indicated elsewhere, one emphasis in amplifier tube design concerns the suppression of harmonic and spurious emission components to maximize usable power transfer and electromagnetic compatibility with other CONUS equipment operating in the higher microwave bands. The single frequency mode with the very large output power of the SPS system causes various nonlinear responses from electromagnetically sensitive receivers (radars, communications) operated on the periphery of the rectenna sites as previously discussed. Since systems operating in these microwave regions are generally of wide bandwidth relative to the lower frequency voice or low rate analog operations, the effect of peak power is aggravated. From electromagnetic compatibility considerations, the advantages of increased bandwidth-lower peak power transmission modes for the SPS will be evaluated. Power delivery performance and control and media sensitivity aspects of the SPS will be addressed in these deliberations. Increased bandwidth introduces additional complexities in satellite array control, varying interactions with the troposphere and atmosphere relative to the frequency variation (e.g., selective fading), and also affects the efficiency of power conversion. Interference related factors include modulation sideband parameters, emission envelope distributions, spatial pattern stability, emission bandwidth, and peak-average amplitude ratios. Two modes are being considered; noise modulation with a cosine spectral envelope, and linear chirp. Occupied bandwidth is one trade-off parameter; the minimum being the 50 MHz width of the industrial, scientific, and medical (ISM) band. Bandwidths in excess of this ISM band will obviously involve extensive reallocations becauseof existing government and nongovernment assignments. The EMC aspects and power system operational impact will be
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