The Effects of the Local Environment on Interference Measurement and Prediction

An extensive set of electric field intensity measurements were taken in and around a typical operating site. The purpose of the measurement program was to determine the effects of the local structure and local noise environment on the propagation and reception of narrowband signals. Test data were obtained between 31 kHz and 2 GHz. Signal intensity measurements were recorded near transmitting sources located within the structure, and signal and noise intensity data were taken remote from the sources along 18 different azimuthal radii out to distances of several hundred feet. Data presentations include total propagation loss and structural shielding effectiveness versus azimuth for each frequency, noise levels at each remote location versus frequency and radiated signal level required near the transmitter for the received signal to equal the noise at each remote site.