Digital Microwave Transmission System.

The report contains information and data gathered in the installation of a microwave test bed, using four conventional LC-8D space diversity microwave radios. 12.8 MBPS digital traffic was passed through the system using QPSK at 70 MHz and quaternary data at baseband. Tests were run in the laboratory and in the field to establish base line characteristics for the test bed. Tests were also run with the imposition of different degrative components into the signal. These impairments consisted of phase distortion, amplitude distortion, phase jitter, modulation nonline-arities and signal strength fading. As expected it was found that the impact of these signal impairments had far less effect on the digital signal quality than for standard FDM signals.