Precipitation Effect on the Coverage Areas of Terrestrial UHF Television Stations in Ondo State, Nigeria

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Author(s) Ajewole M. O | Akinbolati A | Adediji A. T | Ojo J.S
Pages 524-535
Volume 4
Issue 9
Date September, 2014
Keywords Signal Strength, Line of Sight(LOS), Contour Map and Coverage Area.

Abstract

The quality of terrestrial television signal received by viewers is of keen interest to stakeholders in the broadcast world. This research investigates the coverage areas of UHF television signals in Ondo State, Nigeria, andthe effect of precipitation on signal strength through quantitative measurement of the electric field strength of these signals. The signal strength of the transmitters of the Ondo State Radiovision Corporation (OSRC), Akure, (CH 23, transmitting frequency of 487.25 MHz); OSRC, Oka Akoko, (CH 25, of transmitting frequency 503.25 MHz); and OSRC, Okitipupa, (CH 27, of transmitting frequency 519.25 MHz); were taken radially along several routes with the transmitting stations as reference. These measurements were taken using Digital Signal Level Meter, Dagatron TM 10 type and a GPS MAP 76– personal navigator for determining the geographical coordinates as well as the line of sight distances of the various data points from the base stations. Data were taken during the onset of raining season, period of intense rains and the early part of dry season around the towns and villages in all the Local Government Areas of the State as far as road accessibility permits until the signal faded away completely. For channels 23, 25 and 27,the study revealed that coverage areas of 53.5%, 10.0% and 9.0% respectively were possible with the present configuration of the transmitters over the OndoState land mass during the onset of the raining season. During the peak of the raining season,the study revealed that coverage areas of 50.5%, 9.0% and 8.0% were possiblefor Channels 23, 25 and 27 respectively.The study further revealed that coverage areas of 55.5%, 10.5% and 9.5% were possible during the dry season with the present configuration of the transmitters over the Ondo State land mass for Channels 23, 25 and 27 respectively.The combined coverage areas of the three transmitting stations as a percentage of the State land mass was 72.5% for the onset of raining season, 67.5% during the peak of raining season and 75.5% during the early part of dry season. The overall result reveals the significant effect of precipitation on the coverage areas of UHF television signal over Ondo State land mass.

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