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

NTIA Technical Report TR-85-187
Monitoring of Harmful Interference to the HF Broadcasting Service: I. Results of the October 1984 and March/April 1985 Coordinated Monitoring Periods

December 1985


Mary W. Sowers; Gregory R. Hand; Charles M. Rush

Abstract: The results of a detailed investigation to isolate the location of sources of intentional interference to the HF broadcasting service are presented. The investigation was conducted using observations of intentional harmful interference observed at numerous locations around the world during international coordinated monitoring periods operated under the auspices of the International Frequency Registration Board—a permanent organ of the International Telecommunication Union. The types of data used, the methods of analysis employed, and the results obtained are given. In addition to the location of emitters that are the sources of intentional harmful interference to the HF broadcast service, statistics of the occurrence of intentional interference to the HF broadcast service, and statistics of the occurrence of intentional interference directed against specific broadcast operations and languages during the monitoring periods are presented.

Keywords: HF propagation; direction finding; harmful interference; HF broadcasting; HF jamming


To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572
lsegre@ntia.doc.gov


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.

Back to Search Results