Accession Number : AD0771791

Title :   Tactical Tropo Evaluation Criteria.

Descriptive Note : Final rept. Feb 72-Jun 73,

Corporate Author : SIGNATRON INC LEXINGTON MASS

Personal Author(s) : Ehrman,Leonard ; Getchell,Edward H. ; Graham,James W.

Report Date : NOV 1973

Pagination or Media Count : 102

Abstract : ICHANNEL COMMUNICATIONS, Simulators, Multiplexing, Frequency modulation, Distortion, IntermodulationAN/MRC-98A study has been made of the use of a dynamic troposcatter channel simulator as a means of evaluating FDM/FM troposcatter radio equipment. A quadruple diversity simulator was built, and both laboratory and link tests were performed. It is shown that by using the simulator the effects of receiver noise, received power level, path dispersion, modulation parameters, diversity combiners, and radio equipment limitations can be separated and evaluated individually. Measured and theoretically predicted values of intermodulation noise are found to be in good agreement. It is concluded that a simple channel simulator provides a realistic and effective means of evaluating FDM/FM troposcatter radio equipment. (Author)

Descriptors :   *Tropospheric scatter communications, *Radio equipment, Multichannel communications, Simulators, Multiplexing, Frequency modulation, Distortion, Intermodulation

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE