ADAPTATION OF EMPIRICAL ELECTRIC FIELD STRENGTH MODELS FOR TERRESTRIAL TELEVISION BROADCAST IN EKITI STATE, NIGERIA
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- NGN 5000
ABSTRACT
This study investigates the coverage areas of VHF and UHF signals of two television stations in Ekiti State, Nigeria by quantitative measurement of the electric field strength. The signal levels of the Nigeria Television Authority (NTA), Ado Ekiti, Channel 5, (175.25 MHz) and Broadcasting Service of Ekiti State (BSES), Channel 41, (631.25 MHz) transmitters were measured radially along several routes with the transmitting stations at focus. Their corresponding distances from the transmitting stations and locations were also measured and recorded. These measurements were taken using Digital Signal Level Metre, GE-5499, having a signal level range of 30 dBµV – 120 dBµV, and Global Positioning System (GPS) 72 – Personal Navigator. From the data obtained, Surfer 13 software application was used to draw the contour maps of the signal levels around the transmitting stations. The results obtained show that the present configurations of the transmitters of the two television stations do not give an optimal coverage of the state. Only 64.89 % of the entire land mass of the state has television signal coverage. Consequently, some areas in the state are completely out of television signal coverage. So, there is need to have repeater stations at certain intervals to provide reception of television signals throughout the state. Furthermore, this research alsoadapted some field strength models that are best suitable for Ekiti State, Nigeria. The models are free space, Hata, ITU-R P.529-3 and ERC Report 68 models. The results obtained show that the generalised free space model gives more accurate prediction for the field strength of the two television stations in Ekiti State, with the correction factor of -37.84 and Root mean square error of 6.28 dBµV/m for VHF signal(NTA Ado Ekiti) and the correction factor of -25.48 and Root mean square error of 6.21dBµV/m for UHF signal(BSES, Ekiti).
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