Progressive propagation evaluation tests were started in the summer of 1961 to model general case mobile to mobile propagation effects on system parameters of RACEP. RACEP is a pulse, nonsynchronous, time-frequency matrix communications system. The tests augmented earlier system calculations of propagation effects. While many excellent sysance of narrow-band communication systems, tem design aids are available for design guidonly limited information was applicable to the special wide-band pulse

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... system requirements. Backscatter and multipath test.s were conducted using 1 and 2--pulse widths from omnidirectional antennas. These tests were conducted in areas simulating industrial buildareas. The backscatter tests used a solid-state ings, open ground, forestq and semiresidential duplexer to permit common frequency domain sharing of transmit and receive functions. Backscatter pulse widening from 80 db to 150 db down from the transmit peak magnitude were also recorded. Effects of multipath on pulse recorded. Spot radial attenuation contours were shape, amplitude, and pulse width stretching for ranges from 0.1 to 15 miles were included in selective fading and enhancement that might the study. Particular attention was devoted to different frequency domains when subjected to exist between pulses of the same address but the same terrain features. CRO photos of the backscatter, multipath, and selective fading effects on pulses around 141 Mc are included in the report.