FIGURE 8 MICROWAVE POWER DENSITY DISTRIBUTION ON GROUND • Radio-Frequency Interference. RF interference by the fundamental microwave frequency and its harmonics, turn-on and shutdown sequences, random background energy, and other superfluous signals resulting from specific design approaches for the microwavegeneration devices could be controlled by filters, choice of frequency, and narrowband operation. Detailed and specific effects and impacts on radio astronomy services, shipborne radar, and communication systems will have to be determined before the international acceptability of specific frequency allocations can be established. Preliminary investigations indicate that, for example, amateur sharing, state police radar, and high-power defense radar may suffer substantial interference if the 3.3 GHz frequency is chosen as the fundamental frequency. • Noise Pollution. The noise from launch operations will be of concern in the immediate vicinity of the launch facility. Suitable location of the launch facilities and noise control during launches could reduce noise pollution to acceptable levels.
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