Robin H. Haines

Abstract: This report is a study of the potential for sharing in the 4500–4800 MHz band between the fixed-satellite service (FSS) and terrestrial (fixed and mobile) services. The report focuses on decisions of the WARC-ORB-85 concerning planning of the FSS in this band and on their impact on the use of fixed and mobile systems by the United States Government. Since the fixed, mobile, and fixed-satellite (space-to-Earth) services share the band on an equal primary basis, sharing criteria are necessary to protect all services from harmful interference in this band. Of particular interest are line-of-sight and transhorizon radio-relay systems and airborne systems. The report concludes that sharing of the 4500–4800 MHz band by the fixed, mobile, and fixed-satellite services will continue to be feasible.

Keywords: fixed-satellite service (FSS); fixed service (FS); aeronautical mobile service; frequency sharing; Mobile Service; sharing criteria; transhorizon systems

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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