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

Michael Terada

Abstract: In support of the Federal Railroad Administration of the United States Department of Transportation, the Institute for Telecommunication Sciences (ITS) has completed a field spectrum utilization survey designed to examine individual channel utilization and message length distributions. The measurement system was developed by ITS staff members to measure signal strength in each of the 91 channels used by the railroad industry in the frequency band from 160.215–161.565 MHz. The measurement system surveyed three different sites selected for varying conditions such as the different types of traffic over the channels, propagation environments, line–of–sight conditions, and electromagnetic interference.

Keywords: spectrum utilization; spectrum usage; message characteristics; message length distributions

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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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