1.2. 2 SUBSYSTEMS AND TECHNOLOGY A summary set of conclusions and recommendations in each of the major technical areas is provided at the end of each of the Sections 3 through 14. These are collected in the following paragraphs. 1.2. 2. 1 Environmental Effects - Propagation For the atmosphere at frequencies below 3 GHz: a. Absorption and scattering effects are small except for wet hail. b. Refraction changes and gradients cause negligible displacement or dispersion of the high power beam and do not degrade significantly a ground based pilot beam phase front as seen at the transmitting antenna. For the ionosphere at frequencies above 1 GHz: c. Refraction changes and gradients cause negligible displacement or dispersion of the high power beam, and do not degrade significantly a ground based pilot beam phase front as seen at the transmitting antenna. d. Absorption and scattering effects are negligible. e. Faraday rotation has only a small effect for a linearly polarized receiving antenna. f. Changes in electron density caused by power densities of 20 mW/ cm2 and above at 2.45 GHz need to be investigated for possible effects on other ionosphere users. g. Possibility of harmonic radiation from the ionosphere (radio frequency interference effects) should be investigated. 12.2.2 DC-RF Conversion For the amplitron concept: a. Cold pure metal cathode (platinum) for long life. b. Pyrolytic graphite radiator for cathode and anode for light, efficient waste heat radiation. c. Samarium cobalt permanent magnet for light weight and low cost.
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