Between 500 and 750 MHz of spectrum bandwidth can be shared with currently allocated use of this spectrum to provide satellite downlinks for small mobile and broadcast terminals without harming or limiting any operations in the portion of the spectrum from 540 to 1215 MHz. Certain conditions should be observed for effective spectrum sharing: (1) Adequate bandwidth expansion should be used in the downlinks. A ratio of 10 to 20 in RF-to-baseband bandwidth is needed to ensure highest message quality, minimize RF power needed, minimize interference, and maximize total orbital capacity. (2) Small adaptive or adapted arrays should be used at terminals in order to operate in the presence of strong local TV or mobile transmissions, and to selectively link with one or more of the orbital relays even under conditions of rapid changes in antenna orientation. (Prepared for AIAA Third Communication Satellite Systems Conference, April 1970.) 10 pp. Ref.
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