William B. Grant and Ray E. Thompson

Abstract: This report is a study of Travelers' Information Stations (TIS) operating in the 525–535 and 1605–1615 kHz bands. It was prompted by the expansion of the AM broadcasting band from 1605 to 1705 kHz. Included is information on rules and regulations, allocations, technical standards, frequency assignments, and system characteristics. Potential compatibility problems are identified and analyzed. Alternate approaches and policies for TIS users are identified and assessed. Conclusions are drawn and recommendations made on the potential for sharing in the AM and FM broadcasting bands.

Keywords: electromagnetic compatibility (EMC); AM broadcast band; FM Broadcasting Band; 525–535 kHz Band; 1605–1615 kHz Band; Highway Advisory Radio; Nondirectional Beacons; Travelers' Information Stations (TIS)

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.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

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