April 1970 | NTIA Technical Memo ERL TM ITS 232

Modulation characteristics critical to frequency planning for the aero­nautical services

Robert W. Hubbard; Donald V. Glen; William J. Hartman

Abstract: This report summarizes and presents in mathematical, graphical, and tabular form the fundamental characteristics of basic analog and digital modulation processes used in the Air Traffic Control (ATC) communication system. Single channel modes of transmission are primarily considered for voice and data signals, but many of the aspects considered are also useful in describing the baseband signal structure for multichannel systems in which multiplex transmission modes are used. The purpose is to provide a basic set of signal descriptors and character­ istics at several stages in a total ATC communications circuit. The tabulated characteristics may be applied systematically to help determine the initial channel spacing, allocation, and power requirements for a particular system in a given frequency band.

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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