Albrecht P. Barsis

Abstract: This report contains the results of path loss tests performed over a distance of approximately 200 miles between locations in Morocco and in Spain. Frequencies used were 100 Mc and 1046 Mc, and measurements were made continuously during a ten-day period in January, 1957, and a 15-day period in February, 1957. The data were analyzed to produce cumulative distributions of hourly median basic transmission loss values, and their dependence on meteorological parameters.

Results show that the operationally important median values of received field strength exceeded during 99 percent of all hours were not substantially different for the two recording periods, although there were significant differences for the 50 percent and 1 percent values, probably due to the change in transmission location. A number of height gain experiments on 100 Mc showed good agreement with values based on theoretical studies. Simultaneous measurements at two receiving locations separated by approximately 15 miles showed little difference in the characteristics of the received signal. No significant correlation was found between the results of the radio measurements and available meteorological data in the form of refractive index profiles and surface refractivity values.

Keywords: tropospheric propagation measurement

Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

For questions or information on this or any other NTIA scientific publication, contact the ITS Publications Office at ITSinfo@ntia.gov or 303-497-3572.

Back to Search Results