VARIATION OF VHF/UHF TELEVISION FIELD STRENGTH AND TELEVISION HORIZON DISTRIBUTION OVER TELEVISION STATION IN OSUN STATE, NIGERIA
1Ojo, O.A. Oluwafisoye 2P.A.and 3 Omoyeni T.M.
1, 2, 3 Department of Physics with Electronics,
Osun State University Osogbo, Osun State, Nigeria
E-mail: dotun4realoj@gmail.com
ABSTRACT
Many Researchers have continued to carry-out work to determine the actual coverage area of some broadcasting stations. The level of signal strength variation with distance from the transmitter and their horizon distribution, which is also useful for radio transmission designs also remain a major area of research. in Nigeria, little has been documented in this regard for the television stations recorded is quite a number to evaluate broadcasts. The selected television broadcast station is in Osun State, Nigeria. The method used is such that requires the physical presence of the investigator in all the towns and villages within the state with the necessary instrument to carry out the electric field strength measurements in all the locations. The variation of signal level with distance (i.e. propagation curve) was analyzed, to reveal areas of optimum coverage and areas that are poorly serviced. .Drive test measurement was conducted on transmitted signal for the entire broadcast television transmitter in Osun State. Various path loss models were selected to predict the variation at each of the measurement point and they are the Eglimodel, the Cost 231 Hatamodel, the Okumura-Hata model, the Lee model and the Stanford University Model for different terrain. Results indicate that the Cost 231Hata model was found to be the best prediction for the variation.