Roger A. Southwick

Line Impedance Measuring Instrumentation Utilizing Current Probe Coupling

The theory and instrumentation designed to measure the loop impedence of a power line are discussed. The theory of the system is derived first, followed by a discussion of the instrumentation, and finally an evaluation of the system accuracy is given.

A theory to optimize the detection and measurement of EMI signals

The detection and measurement of electromagnetic interference (EMI) signals using conventional EMI receivers and spectrum analyzers is discussed. A statistical approach is used to demonstrate that the probability of detecting a single signal increases as the receiver sweep rate increases. Signal density is defined by the Poisson random variable, and an equation is derived that relates the probability of detection to signal density and receiver sweep rate. The choice of types of receivers and detectors that ensure a maximum probability of detection is considered. A sequential process that first detects signals with a high degree of probability and then performs an accurate measurement of their amplitude and frequency is described.<<ETX>>

A method to optimize the direction and measurement of EMI signals

The detection and measurement of electromagnetic interference (EMI) signals using conventional EMI receivers and spectrum analyzers is discussed. A statistical approach is used to demonstrate that the probability of detecting a single signal increases as the receiver sweep rate increases. This is then demonstrated in the more general case of multiple signals. Signal density is defined by the Poisson random variable, and an equation is derived that relates the probability of detection to signal density and receiver sweep rate. Also discussed is the choice of types of receivers and detectors that will ensure a maximum probability of detection. A sequential process that first detects signals with a high degree of probability and then performs an accurate measurement of their amplitude and frequency is described. >

An Active Bowtie Antenna for E-Field Measurements

This paper describes an electrically short, active bowtie antenna designed for use in the 30 to 550 MHz frequency range for radiated electric-field measurements. The antenna can be used either as a bowtie, that is, dipole, or, by removing one element, as a vertical monopole.