TERRAIN AND CLIMATOLOGICAL EFFECTS ON MICROWAVE SIGNALS: A CASE STUDY OF NTA AKURE, MICROWAVE LINK BETWEEN OBA-ILE AND IJU.

Abstract

This study presents the results of the path profile analysis of a microwave link hetween stations on the surface of the earth transmitting at a frequency of 7.7760Hz using the Nigerian Television Authority (NTA) transmitters at Oba He, Akure and the receiver at Iju, as a case Study. The study predicts the transmission loss statistics between the transmitter and the receiver located 13.2km apart. The prediction is obtained by summing the transmission losses given by the line-of-sight, diffraction and attenuation models. Typical results of these analyses for single knife-edge diffraction and rainfall rates at 2Smm/h, SOrnm/h, IOOmmlh and lS0rnm/h, are investigated for widespread, shower and thunderstorm rain types that are available in Nigeria. The results of the computed daily and monthly transmission losses when compared with the daily or monthly transmitted effective isotropic radiated power (e.i.r.p), are reasonable enough, as only about 1/3 or an average of 33% of these are lost at transmission periods, either daily or monthly. The procedure would be useful for estimating transmission losses at microwave frequencies in tropical locations with similar radio meteorological and rainfall characterist ics.