Results of Propagation Tests at 505 mc and 4,090 mc on Beyond-Horizon Paths

This paper gives the results of some radio propagation tests which were made on two beyond-horizon paths in New-foundland. During these tests simultaneous transmissions at 505 mc and 4,090 mc over a 150-nautical mile path were measured for a full year, and transmission at 505 mc over a 255 mile path was measured for a period of 5 months. Both of these paths were partly over land and partly over water. Long term median signal levels and fading statistics for the two paths are given, as well as the results of some measurements of the improvement obtained from space diversity reception and the gain realized from large (28 foot) antennas on the 150-mile path. The test results provide further evidence of the feasibility of using uhf beyond-horizon links in communication systems.