Mediciones y simulación de atenuaciones producidas por edificaciones que afectan a la banda de radiodifusión en frecuencia modulada en la ciudad de Riobamba.

Abstract

In this paper attenuation due to buildings, affecting the broadcast band frequency modulated in the city of Riobamba were measured and simulated. The equipment used for measurement of power was the Anritsu MS2724B Spectrum Analyzer. The materials selected for data collection construction were: glass, brick, block, mixed construction and underground located at the Agency for Control and Regulation of Telecommunications, The Escuela Superior Politecnica Chimborazo, Multiplaza and two houses located in the center of the city of Riobamba. The measures stations were chosen based on the location of their transmitters, these are: Public Radio of Ecuador, High Caracol Radio Cultural Identity, Tricolor FM, FM Summit, National Assembly and Stereo Family. From measurements, 121 data were obtained, these were used to construct a mathematical modeling in the CurveExpert program. The frequency in megahertz was chosen as an independent variable and as dependent variable the attenuation measured in decibels was selected. Once mathematical equations of attenuations were obtained, a program called Radiolink was created in Visual Studio software. Rational functions in which the highest rate of loss occurs in the underground, it is 41.5 decibels, while the material less affects the signal is glass, with an attenuation of 5.42 decibels, these data was obtained as simulation results of attenuations. When calculating the rate of signal noise, it is concluded that the most immune radio interference is National Assembly, with a value of 67.52 decibels, while the most susceptible to lose is Radio Cultural, with 20.73 decibels. In addition, when running the simulator Radiolink determines whether a radio link is feasible. For researches, it is recommended the study of attenuations for different frequency bands.