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

Frank 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 ccharacteristics, 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 stanstandard 461; power in circuits; radiation hazard; RF measurement

To request a reprint of this report, contact:

Lilli Segre, Publications Officer
Institute for Telecommunication Sciences
(303) 497-3572

For technical information concerning this report, contact:

Frank H. Sanders
Institute for Telecommunication Sciences
(303) 497-7600

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