Browsing by Author "Agubor, C. K."

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    A practical guide to site selection for communication antennas and their support structures in Nigeria
    (SAVAP International, 2013-01) Agubor, C. K.; Ndinechi, M. C.; Opara, R. O.
    Radio broadcasting and telecommunication transmitter stations should have their antennas properly positioned to make them capable of providing the required services. Suitable location of antenna structure will enhance signal clarity, wider coverage area and satisfactory reception of radiated signal. In most cases, engineering considerations in the determination of a station’s performance are treated analytically. However, it is important to know that the ability to serve large audience effectively and at the same time achieve wider signal coverage are greatly affected by the excellence of the transmitter location and its selection must be governed or influenced by experience with intangibles not subject to mathematical calculations. Field survey method was adopted by which information from the major radio and wireless Operators in the country was obtained. The paper therefore focuses on the various factors guiding the selection of suitable transmitter sites. It also presents a step-by-step guide and some important considerations to be taken into account from the planning to the site-acquisition stages. It recommends colocation of infrastructures which is an option not yet attractive to Service Providers in Nigeria.
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    Design and implementation of a simple HMC6352 2-Axis-MR digital compass
    (U. P., 2016-03) Agubor, C. K.; Ezeh, G. N.; Olubiwe, M.; Nosiri, O. C.
    This paper deals with the design and implementation of a simple HMC6352 2-axis digital compass.Most compasses have been of the analogue type with magnetic needles as pointers. Replacing the “old” magnetic needle compass or the gyrocompass by an electronic solution offers advantages like having a solid-state component without moving parts and the ease of interfacing with other electronic systems. In this work, the aim is to design and implement a digital compass. To realize this, we made use of HMC6352 which is a 2-axis MR (magneto-resistive) sensor from Honeywell, Arduino Uno board with an onboard ATmega328 microcontroller chip, and a 16x2 character Liquid Crystal Display (LCD).We adopted the magneto-resistive (MR) technology as compared to flux-gate sensors common in most electronic compasses which has the disadvantage of making the device bulky. The trial test carried out with the completed HMC6352 digital compass showed a reading of 232.8 degrees West indicating its effectiveness in direction finding
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    ItemOpen Access
    Optimal design and fabrication of a wideband antenna for terrestrial DTV reception
    (U. P., 2016-10) Agubor, C. K.; Onwumere, C.
    Optimal design and fabrication of a wideband antenna for terrestrial digital TV (DTV) reception is presented in this paper. Reception of poor digital TV (DTV) signal using Yagi antennas supplied by cable providers in some suburban and rural areas in Nigeria has been a major concern to subscribers. This problem could be solved by the use of high gain antennas such as the one presented in this paper. In developing this antenna, NBS 688 technical notes and antenna design curves were applied and the resulting antenna estimate was modeled, simulated and optimized with 4NEC2 antenna design software. Optimal design verification was achieved using EZNEC v.6.0 antenna modeler. On testing after fabrication, received signal strength was 60dB compared to 45dB obtained with the service provider’s conventional Yagi antenna in position. A better picture clarity was observed owing to the15dB increase in signal level.