Definitive Open Area Test Site Qualifications

Abstract

Present methods for determining open area as well as other test site qualifications to measure radiated emissions for compliance with FCC and other regulatory requirements depend on comparing horizontal polariza­ tion site attenuation measurements to a theoretical m odel.1 Horizontal polarization measurements are generally inadequate to identify site anomalies which may actually cause significant errors when equipment emision com­ pliance is subsequently measured. Both vertical and horizontal site attenuation measurements are necessary as well as adequate theoretical models to use in the comparisons. This paper summarizes recent efforts of the voluntary standards community to standardize adequate site qualification measurements. This work is being considered primarily by the American National Stan­ dards Institute Accredited Standards Committee C63 (EMC) and the Special International Committee on Radio Interference (CISPR).2,3