Accession Number : AD0607399

Title :   APPRAISAL OF CO-SITE INTERFERENCE AND EFFICIENCY OF THE ABM FREQUENCY PLAN,

Corporate Author : ARMY ELECTRONICS LABS FORT MONMOUTH N J

Personal Author(s) : Castellini,Nello R.

Report Date : JUL 1963

Pagination or Media Count : 1

Abstract : In order to be free of spurious interference, any frequency assignment whatsoever must be drawn from frequency groups, the members of which belong to the logical product of classes of frequencies defined in conjunction with the mutual interference chart (MIC). If this condition is not met, the groups contain potential interferers which, in frequency assignments, may form combinations giving rise to spurious interference. Given groups of specified size and number of interferers, and frequency assignment plans, there is a definite probability that various degrees of interference will be encountered if one or more choices of frequencies are made. These results are formally established and applied to the abm plan. This plan presupposes an MIC which consists of a swath symmetrically disposed about the main diagonal. An experimental MIC and an abm assignment were examined in the light of the theoretical results. The abm plan has the advantage of relative simplicity, but is wasteful of useful frequency combinations and provides assignments which, especially at low frequencies (in units of the intermediate frequency), are likely to contain interference.

Descriptors :   (*RADIO INTERFERENCE, REDUCTION), (*RADIOFREQUENCY, COMPATIBILITY), (*FREQUENCY, SELECTION), MULTIPLEXING, WAVE PROPAGATION, RADIO RELAY SYSTEMS, MILITARY REQUIREMENTS, COMMUNICATION AND RADIO SYSTEMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE