Si en su localidad la recepción de las estaciones de onda media es difícil, e incluso la de ondas cortas, la conexión de antenas externas puede ser la mejor solución. Sin embargo, la mayoría de las radios portátiles de bajo costo no tienen lugar para conexión de antena externa. En este caso, puede ser improvisada una antena de cuadro de irradiación, como muestra la figura 1.

 


 

 

   En una caja de zapatos enrollamos unas 5 o 10 vueltas de alambre esmaltado 28 o de espesor cercano (Puede usarse hilo común.), conectando esa bobina a una antena externa ya la tierra.

   El radito portátil se colocará en el interior de la caja en la posición que dé la mejor recepción, habiendo una considerable mejora en la sensibilidad, como puede ser percibido.

   La conexión a tierra debe realizarse en objetos de metal en contacto con el suelo, o si no es posible, en una barra de metal de unos 30 o 40 cm enterrada en el suelo en un lugar húmedo.

   Como hemos visto, los defectos y mejoras sugeridas en esta parte del libro no involucraron conocimientos de Electrónica propiamente, ya que poco movemos en componentes del circuito.

   Desafortunadamente, no son sólo éstos los defectos que pueden aparecer en las radios transistorizadas y otros aparatos. Por eso, debemos en este próximo capítulo cuidar de los defectos electrónicos propiamente, empezando por los más simples.

   A medida que analizamos estos defectos, enseñar al lector los nombres de las piezas y también sus funciones, así como la manera de usar algunos instrumentos importantes.

 

 

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