Accession Number : AD0636592

Title :   FREQUENCY ASSIGNMENT STUDIES.

Descriptive Note : Quarterly progress rept. no. 3, 1 Feb-30 Apr 66.

Corporate Author : ELECTRO TECHNICAL ANALYSIS CORP TUCSON ARIZ

Personal Author(s) : Hoehn, A. J. ; McCurnin,T. W.

Report Date : JUN 1966

Pagination or Media Count : 83

Abstract : This is a study to improve electromagnetic compatibility in the field army through development of frequency assignment practices. Further practical aspects of the exclusion and bookkeeping charts involving use of the exclusion template are considered. An improved template is described which reduces by a factor of two the effort required to prepare exclusion charts. A simplified process of recording exclusion data on plastic strips facilitates establishment of the bookkeeping chart and solution of assignment problems. Radio net interference is classified into on-site, adjacent-channel and co-channel problems. The basic framework required for a probabilistic receiver model is discussed. Probabilistic considerations in modeling a single receiver are considered. Several existing receiver modules are examined, and it is found that none of the models gives a true probabilistic picture of receiver action. It is established that two distributions are of importance; a short-term distribution in phase, and a long-term distribution in amplitude of received signals. It is shown that in many cases little realism will be lost if all signals are computed on a completely deterministic basis up to the i-f output. The problem thus is reduced to a probabilistic calculation of the output of an ensemble of signals impressed on a demodulator.

Descriptors :   (*RADIOFREQUENCY, SCHEDULING), (*ELECTROMAGNETIC COMPATIBILITY, COMMUNICATION AND RADIO SYSTEMS), (*COMMUNICATION AND RADIO SYSTEMS, TACTICAL WARFARE), FREQUENCY, MILITARY REQUIREMENTS, INFORMATION THEORY, RADIO TRANSMISSION, NETWORKS, MIXERS(ELECTRONICS), RADIO RECEIVERS, MATHEMATICAL MODELS, GRAPHICS

Subject Categories : Cybernetics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE