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A low-cost spectrum analyzer is presented, based on a commercial software defined radio and an open-source application package. Fundamentals regarding the receiving operation and its sensitivity are presented, along with measurements, of two 8 and 12-bits software defined radio models. An application, run within GNU Radio, is presented, deployed to overcome the hardware analog-to-digital converter limitation to monitor wide bandwidths. Results are shown for two different frequency ranges, 200 MHz bandwidth.

Date of publication xxxx 00, 0000, date of current version xxxx 00, 0000.

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RESUMOUma blindagem eficiente é um item importante para garantir o funcionamento adequado dos equipamentos eletroeletrônicos. Dentro deste contexto, este trabalho apresenta uma metodologia simplificada para a medição do fator de qualidade da blindagem de cabos coaxiais, com a qual é possível determinar o fator de qualidade da blindagem de qualquer cabo coaxial. Foi realizada também uma modelagem computacional com uso do software CST-MWS®Microwave Studio. Fig.1 -Diagrama em blocos referente a geração, transmissão e a vítima da interferência

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This article reports an SDR (software-defined radio) operating as a receiver for nearfield measurement, aiming at EMC pre-compliance tests. The SDR replaces professional-grade RF instrumentation with benefits, with lower costs. Its software application is based on open-source GNU-Radio, which grants a higher versatility to the signal processing and visualization, requiring a single laptop to analyze the data and control the whole system, in real time. Reported tests used two commercial PCB magnetic field probes, and a proof-of-concept near-field imaging is performed in an L-shaped transmission line at 1100 MHz.

This article presents a set of measurements and simulations that evaluate the technical feasibility of a Compact Open Area Test Site (COATS), for the frequency range of 200 MHz to 2 GHz. Its main goal is to provide shielding effectiveness measurements. The described test setup is used for the tests in both semi anechoic chamber and COATS. These experimental and computational results offer orientations and guidelines about the best method to measure radiated emission in a COATS. These measurements results can be quantified through the Feature Selective Validation technique.