EXPERIMENTAL MEASUREMENT OF SIGNALS ATTENUATION OF SOBI FM AT VHF ALONG ILORIN - JEBBA ROAD, NIGERIA
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Abstract
The study of propagation loss and fade margin of 101.9MHz (Sobi FM) signals along Ilorin (Lat 80541 & Long 40551E) – Jebba (Lat 90111N & Long 40821E) road at very high frequency (VHF) band was done experimentally using spectrum analyzer. Alongside theoretical calculation to determine the attenuation was also done using Friis and Free Space attenuation equations. The attenuation and fade margin were measured regularly at intervals of two kilometers (2 km) from the base station up to a total of sixty kilometers (60 km) along the chosen axis. The analytical models were obtained in form of polynomial equations for received power, measured attenuation and the fade margin of the signals. The calculated results correlated with the measurements (Correlation coefficient value R2 = 1), but gave deviation when compared with the measurements. The variance of the results for the existing formula with the measurements was adjudged to hills, valleys, trees and bends along the links. The highest value of the fade margin obtained (75.89 dB) did not exceeded the receiver’s sensitivity of 80 dB, which implies that the radio-signals can be improved, by increasing the height and the power of transmitting antenna. This research provides information on improving Sobi FM transmission coverage and a guide to upgrade or redirect their transmission signals appropriately.
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Aboaba, O.A. (2003). Experimental Studies in VHF/UHF frequencies in A Tropical Climate, XV URSI 2003, XXVLth General Assembly Toronto, Canada. Pp 375.
AbdAlaziz, W. (2011). Design and Development of Multi-Band Microstrip Rectangular Fractal Antenna for Wireless Applications. 10.13140/RG.2.2.21507.45606.
Al-Basheir M.S., Shubair, R.M. and Shariff, S.M. (2006). Measurement and Analysis for signal Attention through Date Palm Trees at 2.1 GHz Frequency, Sudan Engineering Society Journal, 52(45):17 – 22.
Balanis, C. (2005). Antenna Theory. 3rd Edition, ISBN 0-471-66782-X, John Wiley & Sons Ltd., USA
Barilla, T., Barwick, S. and Saltzberg, D. (2011). Ross Ice Shelf (Antarctica) in Situ Radio, Frequency Attenuation. Journal of Glaciology, 57(201):61-66.
Csurgai, H. and Bito, J. (2004). Fog Attenuation on V-Band Terrestrial Radio and a low Cost Measurement set-up. Budapest University of Technology and Economics. Department of
Gurung, S. and Zhao, J. (2011) Attenuation of microwave Signal and its impact on Communication System. Retrieved on September 14, 2011 from http: //www.sanjayagurung.coms
Grayson, C. (2012). Formula for calculating Fade Margin retrieved January 2021, from www.ehow.comm
Kai, C. (2000). RF and Microwave Wireless Systems. ISBN: 0-47135199-7, John Willey
Kraus J. D, Marhefka, R. J., Muuk, B. A., Lehto, A., Vainikainen, P., Newman, E. H. and Walker, C. (2002). Antennas for All Applications. Third Edition, ISBN: 0-07-232103-2, McGrawHill, USA.
Lehpaner, H. (2010). Microwave Transmission Networks; planning, Design and Deployment, retrieved, January 2021 from www.ehow.coom.
Lee, (1998). Mobile Communications Engineering: Theory and Applications. McGraw-Hill, USA.
Middleton, J. (2003). The propagation aspects of broadcasting at VHF and UHF, in propagation of Radio Waves. 2nd edition, The Institute of Electrical Engineer London, UK,pp.253-255.
Prasad, M., Rama, Rao, T., Ahmad, I. and Paul, K. (2006). Investigation of VHF signals in bands I AND II in southern India and model comparisons. Indian Journal of Radio and Space Physics. 35:198 - 205.
Poole, I. (2010). Radio Signal Pathloss retrieved December 2011, from Radio Electonics.com.
Rhodes, J.E. (2001). Basic Antenna Handbook,
Sanjaya, G. and Jinhsu, Z. (2004). Attenuation of Microwave Signal and its impacts on Communication System. Department of Electrical Engineering, College of Engineering University of North Texas.
Shoewu, O. and Edeko, F.O.(2011). Microwave Signal Attenuation at 7.2GHz in rain and hamattan Wheather,American Journal of Scientific and Industrial Research http://www.scihub.org/AJSIR-SSN:2153-649X
Stutzman, W.L. and Thiele, G.A. (2012). Antenna Theory and Design. 3rd Edition, John Wiley and Sons, Hoboken.
Ulaby, F., Michielssen, E. and Ravaioli, U. (2010). Fundamental of Applied Electromagnetics. 6th Edition, Prentice Hall.