Experimental investigation of line-of-sight propagation at 13.5ߝ15.0 GHz

A 13.57ߝ15.0 GHz sweep measurement equipment designed to measure amplitude, differential phase, and differential gain of a propagation path is briefly described, and the qualities of the data are discussed. Statistics of fadings and intermodulation noise in the frequency band of 13.6 to 14.9 GHz from a 45 km l.o.s propagation path in Denmark are presented. The statistics cover the period July 1974 to July 1975. Both monthly and diurnal variations of the fading are given as well as the distribution of the fading durations. Separate statistics are given for multipath propagation and for precipitation attenuation. Distributions of the 1 minute and the 1 hour mean values of total noise power for the whole period, and for the worst month are presented. The monthly variations of these values are also presented. Based on the data it is concluded that this propagation path will satisfy the relevant part of the CCIR Recommendation 395ߝ1, concerning the transmission quality in the worst monthߞprovided the antennas are protected against wet snow and the system uses some type of diversity to cope with multipath propagation.