TRANSMISSION LOSS AND SPACE DIVERSITY MEASUREMENTS OVER A MOUNTAIN DIFFRACTION PATH.
INSTITUTE FOR TELECOMMUNICATION SCIENCES AND AERONOMY BOULDER COLO
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In July and October of 1965, tropospheric propagation measurements were made over a 223 kilometer mountain-obstacle diffraction path in Colorado using frequencies 0.9, 4.6 and 9.2 GHz. The July investigation was a continuation of work previously reported, and was conducted to obtain additional information on the time variability of basic transmission loss over mountain-obstacle paths. The October measurement program was expanded to yield information concerning the horizontal and vertical distribution of basic transmission loss in a plane perpendicular to the path. In addition to movable antennas, a second receiver on 4.6 GHz was installed with a combiner to obtain statistics on space diversity improvement. The data presented here include a comparison of height gain effects over the entire diffraction path with line-of-sight height gain effects over the path between the diffracting obstacle and the receiving site. Variations of transmission loss dependent on horizontal distance perpendicular to the propagation path are also discussed. Conclusions are drawn concerning the proper methods of deploying antennas to take maximum advantage of space diversity on this type of path. Author
- Radiofrequency Wave Propagation
- Radio Communications