GROUND-WAVE RECEPTION AND GROUND CONDUCTIVITY

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dc.contributor.authorEZEADUBU, O.N.D.
dc.date.accessioned2015-03-06T12:31:52Z
dc.date.available2015-03-06T12:31:52Z
dc.date.issued2015-03-06
dc.descriptionA thesis submitted to the Postgraduate School, Ahmadu Bello University, Zaria in partial fulfilment of the requirements for the degree of Master of Science in Electronics and Telecommunications. Department of Electrical Engineering Faculty of Engineering Ahmadu Bello Universityen_US
dc.description.abstractThis investigative research consists of three parts: Plotting of theoretical propagation curves with the aid of computer, determining the effect of the variation of the ground conductivity on ground-wave field strength and deduction of the ground conductivity. Theoretical ground-wave propagation curves were plotted for flat earth with the aid of a digital computer for some broadcast frequencies in use in the Northern States of Nigeria, Computer CALCOMP programmes were developed for the plots. The effect of the variation of the ground conductivity on ground-wave field strength was investigated by measuring the field strength radiated from MW radio stations for five months, March - July, 1981. The measurements showed that the radiated field strength was practically constant irrespective of whether it was rainy or dry season. One of the conclusions from the measurements was that as the variation of the ground conductivity and vegetation have opposite effect on ground wave the effective influence of the variation of ground conductivity could be so small that it could not be detected with the field strength meter. The field strength increases with increase in the ground conductivity while vegetation attenuates ground wave. The determination of the ground conductivity in the northern parts of Nigeria was carried out by the attenuation technique. The ground resistivity method was used in Samaru - Zaria to confirm the result obtained there by the attenuation technique. According to the research results, 2, 3» and 4 mmho/m were obtained as the ground conductivities in parts of Kaduna State; 3 mmho/m was obtained in Kano State; 2 mmho/m was the value obtained in Niger State. 3 and 4 mmho/m were obtained in Sokoto State. A CALCOMP programme was used in plotting the measured field strength on the theoretical propagation curves. All the CALCOMP programmes used in this research can be found in the Users' Manual of the CALCOMP Programmes for Plotting Theoretical Ground-Wave Propagation Curves written by the author.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/6123
dc.language.isoenen_US
dc.subjectGROUND-WAVE,en_US
dc.subjectRECEPTION,en_US
dc.subjectCONDUCTIVITYen_US
dc.titleGROUND-WAVE RECEPTION AND GROUND CONDUCTIVITYen_US
dc.typeThesisen_US
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