Frank H. Sanders

Abstract: This NTIA Technical Memorandum provides a single, comprehensive set of derivations of the mathematical relationships among power in a radio transmitter or measurement circuit, the associated incident field strength in space, transmitter-receiver antenna characteristics, free space propagation equation variables and radiation hazard limits. An NTIA Electromagnetic Field Strength Unit Converter spreadsheet developed from this Technical Memorandum is available for download here.

Keywords: field strength; antenna correction factor; effective isotropic radiated power (EIRP); hazards of electromagnetic radiation to fuel; hazards of electromagnetic radiation to ordnance; hazards of electromagnetic radiation to personnel; measured power; military standard 461; power in circuits; radiation hazard; RF measurement

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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