Fig. 7. Comparison of external energy subsidies for alternative power plants. Note: 20 year life assumed unless otherwise noted. Source: Refer ence 35. Until acceptable international standards have been agreed upon, a microwave power flux density of 0.1 mW/cm2 at the perimeter of the receiving antenna site has been assumed for the system design studies. The effects of either an increase or decrease in the permissible microwave power flux density based on international standards can be evaluated as a function of system design parameters and economic factors. 8.2.9. Radio frequency interference. Worldwide communications are based on internationally agreed upon and assigned frequencies. Because the frequency bands spanning the most desirable operating frequency of the SPS are already in heavy use, the potential for radio frequency interference (RFI) of the SPS with existing communication systems is high. The microwave generators will have to be designed to filter out most spurious outputs. RFI could occur during the shutdown of the microwave generators or result from fundamental microwave frequencies and its harmonics, random background energy, and other superfluous signals. Although RFI can be controlled by the selection of frequency, narrow band operation, and use of filters, detailed and specific effects and impacts on radio astronomy, shipbome radar, and communication systems will have to be determined before the international acceptability of specific frequency allocations can be assured. The RFI effects and international agreements on frequency assignments are issues that will have to be faced at various stages during the SPS development, and were considered at the World Administration Radio Conference, Geneva, 1979.
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