Accession Number : AD0282785

Title :   DETERMINATION OF THE UHF MULTICARRIER TELEMETRY ASSIGNMENTS

Corporate Author : NAVAL AIR DEVELOPMENT CENTER JOHNSVILLE PA ENGINEERING DEVELOPMENT LAB

Personal Author(s) : DOTO,NICHOLAS J.

Report Date : DEC 1962

Pagination or Media Count : 1

Abstract : The simultaneous operation of several telemetry carriers can result in an additio al form of interference (intermodulation interference) as well as the more common forms such as adjacentchannel and spurious interference. Intermodulation interference, resulting from third- and fifth-order intermodulation products formed by nonlinear operations occurring in transmitting or receiving systems, can be made to fall on unused channels by judicious selection of simultaneously operating channels from a band of uniformly spaced channels. The method is discussed for selection of frequencies for multicarrier operations. Tables developed from computer runs are included listing groups of 4 channels in a band of 40, groups of 4 in a band of 100, and groups of 5 in a band of 40, which are free of intermodulation interference. In addition, the difference triangle is introduced as an alternate method for determining a small number of groups in the absence of tables. (Author)

Descriptors :   *RADIO INTERFERENCE, *RADIOFREQUENCY, *TELEMETER SYSTEMS, DETERMINATION, FREQUENCY, MATHEMATICAL ANALYSIS, MODULATION, MULTIPLE OPERATION, NONLINEAR SYSTEMS, ULTRAHIGH FREQUENCY

Distribution Statement : APPROVED FOR PUBLIC RELEASE