Experimental Evaluation of Diversity Receiving Systems

Methods used in a long-range experimental study of fading with ordinary and diversity receiving systems are discussed. Results are expressed statistically in terms of the nonusable circuit time and also in terms of the number of fades per minute below least usable level. Data for this analysis are obtained on semiautomatic equipment which measures the total time the signal spends in each of seven pre-established intervals of signal strength and counts the number of times the signal enters each interval. The instruments thus accomplish at the time of recording a substantial part of the analysis.