Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Andrew Farrar

Abstract: The power flux-density (pfd) limits for satellites operating in the 2025-2300 MHz frequency range were calculated. Two computer models, one developed by the Bell Telephone Laboratories (BTL) and the other by the Systematics General Corporation (SGC), were used in the analysis. Modifications to these models were made in order to enhance their accuracy in the evaluation of the pfd limits in this and other bands. Distinctions were made between the satellites in geostationary satellite orbit and those in non-geostationary orbits. Two different sets of limits were calculated, one for the satellites in the geostationary satellite orbit and the other for the satellites in non­geostationary orbits. These limits were calculated using the technical characteristics of equipment in the 2025-2300 MHz frequency range and the criteria of noise due to interference from satellites set by the CCIR Recommendation 357-3. The pfd limits calculated here for the 2025-2300 MHz frequency range are applicable in the portions of this frequency range authorized for use by space services. These limits were compared with the existing limits in the NTIA Manual and the analysis indicated that the pfd limits for satellites could be relaxed.

Keywords: electromagnetic compatibility (EMC); computer model; spectrum sharing; power-flux-density limits; 2025-2300 MHz; systems in space and fixed service sharing

To request a reprint of this report, contact:

Ed Drocella, Chief,
Spectrum Engineering and Analysis Division
Office of Spectrum Management
National Telecommunications and Information Administration
(202) 482-1652

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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