EFFECTS OF CLEAR WEATHER CONDITIONS ON SATELLITE AUDIO SIGNALS IN AKURE SOUTH WEST, NIGERIA.

Abstract

This project was carried out to analyse the performance of Satellite Television Receive Only (TVRO) communication systems in terms of the propagation loss in the C-band (6/4 GHz) frequencies. A 3.0m parabolic dish was constructed by the method of moulding using glass fibre. This dish was used to receive audio signals from some satellites and the field strength measured by a 40MHz oscilloscope. The results show that the noise temperature Of the parabolic dish was reasonably low thus resulting in low system noise temperature, high carrier to noise ratio and high figure of merit for the TVRO. The atmospheric losses in channels on satellites in the eastern hemisphere are higher than those in satellites located in the western hemisphere. This is due to the low elevation angle of satellites in the east which resulted in the signals travelling longer path lengths in this hemisphere. There was no appreciable loss associated with the receiving system, rather the system improved the level of the weak signal received thus resulting in quality intelligent output by the indoor receiver-monitor combinatiom