Radio attenuation at 11 kmc and some implications affecting relay system engineering

Increasing use of the common-carrier microwave-frequency bands at 4 and 6 kmc (kilomegacycles) has directed attention to the next higher band at 11 kmc. All three bands are subject to atmospheric fading, but propagation at 11 kmc differs from that at the lower frequency bands chiefly in its vulnerability to rain. Knowledge of the statistics of the excess path loss caused by rain is a necessary prerequisite to 11-kmc system design, and therefore an experiment was undertaken to extend the modest body of available knowledge.