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.
