Diseño de módulos electrónicos para el sistema receptor PMR446
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2025
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El presente Trabajo Fin de Grado (TFG) tiene como objetivo el diseño e implementación de un sistema receptor modular compatible con el estándar PMR446, ampliamente utilizado en comunicaciones por radio de corto alcance sin necesidad de licencia. El sistema propuesto se basa en una arquitectura superheterodina de doble conversión, que permite una mayor selectividad y reducción de interferencias mediante el uso de dos frecuencias intermedias.
Para ello, se han diseñado, fabricado y evaluado distintos módulos funcionales del receptor, como la antena, amplificadores de bajo ruido, filtros de RF, mezcladores, etapas de frecuencia intermedia, detectores y demoduladores. Cada módulo ha sido caracterizado mediante simulaciones y medidas experimentales para garantizar su correcto funcionamiento e integración. Finalmente, se analizan las prestaciones del sistema completo y se proponen posibles líneas de mejora orientadas a futuras implementaciones o ampliaciones del receptor.
This Bachelor´s Thesis aims to design and implement a modular receiver system compatible with the PMR446 standard, widely used in short-range license-free radio communications. The proposed system is based on a dual-conversion superheterodyne architecture, allowing greater selectivity and interference reduction through the use of two intermediate frequencies. To achieve this, several functional modules of the receiver have been designed, built, and evaluated, including the antenna, low-noise amplifiers, RF filters, mixers, intermediate frequency stages, detectors, and demodulators. Each module was characterized through simulations and experimental measurements to ensure proper operation and integration. Finally, the overall system performance is analyzed and future improvements are proposed for subsequent developments or system enhancements.
This Bachelor´s Thesis aims to design and implement a modular receiver system compatible with the PMR446 standard, widely used in short-range license-free radio communications. The proposed system is based on a dual-conversion superheterodyne architecture, allowing greater selectivity and interference reduction through the use of two intermediate frequencies. To achieve this, several functional modules of the receiver have been designed, built, and evaluated, including the antenna, low-noise amplifiers, RF filters, mixers, intermediate frequency stages, detectors, and demodulators. Each module was characterized through simulations and experimental measurements to ensure proper operation and integration. Finally, the overall system performance is analyzed and future improvements are proposed for subsequent developments or system enhancements.













