Digital Transmission Evaluation Project MW518 (QPSK) Test.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 31, 1975
- Accession Number
- ADA018719
Entities
People
- Edward F. New
- Harold F. Bower
- James E. Hamant