Accession Number : ADA018719

Title :   Digital Transmission Evaluation Project MW518 (QPSK) Test.

Descriptive Note : Final rept.,


Personal Author(s) : Hamant,James E. ; Bower,Harold F. ; New,Edward F.

Report Date : 31 OCT 1975

Pagination or Media Count : 74

Abstract : The Collins Radio MW-518 (QPSK) digital radio was tested in back-to-back configuration and actual link configuration for determination of transfer parameters to isolate propagation effects in link testing and the development of standard test techniques. The radio has a maximum propagation rate of 19.804 Mb/s (288 voice channels) at 8.11 GHz, and other rates selection of 12.553 Mb/s, 6.276 Mb/s and 1.544 Mb/s. Ber vs RSL characteristics are displayed and analyzed as the primary mode of equipment evaluation. Actual link data is analyzed in terms of BER availability. Carrier to interference data, T-1 line tests and theoretical predictions are compared. Frequency stability, quantizing distortion, crosstalk, orderwire, signal to noise ratio, and data rate variations are measured and presented. Power spectra are displayed and compared to FCC requirements. (Author)

Descriptors :   *Microwave communications, *Pulse communications, Radio transmission, Radio links, Digital systems, Phase shift keyers, Data links, Power spectra, Distortion, Crosstalk, Frequency stabilizers, Signal to noise ratio, Radio interference

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE