and these have been investigated to varying extents. The results of these investigations have been summarized as follows: • For the atmosphere at frequencies below 3 GHz: Absorption and scattering effects are small except for wet hail. 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: 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. Absorption and scattering effects are negligible. Faraday rotation has only a small effect for a linearly polarized receiving antenna. Changes in electron density caused by 2 2 power densities of 130 mW/in (20 mW/cm ) and above at 2.45 GHz need to be investigated for possible effects on other ionosphere users. (See Section VII) Possibility of harmonic radiation from the ionosphere (radio frequency interference effects) should be investigated. The last item above, ie.., the potential for RFI, is cited as a high risk item and detailed investigations are recommended. It is further stated that since this has a potentially significant impact on radio astronomy users, they must be major participants in this activity.
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