The need for review of CCIR curves for tropical Africa for effective television broadcasting planning

摘要

This paper examines how effective television broadcasting can be achieved in tropical African countries by developing new set of values for the International Radio Consultative Committee (CCIR) curve for use in sub-tropical Africa. Seven television stations were chosen in Lagos State Nigeria and the signal strength of each station was determined using a field strength metre in several locations around the state. The value obtained at a particular distance (in kilometres) is compared with values for free space and CCIR curve respectively. Computer software was then used to produce a graphical comparison between the CCIR curve and actual measurement. The results show that the CCIR curve is inadequate to guide effective television broadcasting in Nigeria and by extension, subtropical Africa. This result is considered valid for many tropical countries.