Este circuito permite convertir una vieja radio AM valvulada que tenga las válvulas indicadas en el esquema en la salida en un pequeño transmisor de AM con un alcance que llega a los 100 metros.

Lo que se hace es agregar una llave conmutadora que cambia la salida de audio por una bobina osciladora que genera la señal de RF. La modulación externa viene a través de C4 pudiendo ser un micrófono cerámico o un pequeño amplificador con micrófono.

 

La antena consiste en un pedazo de hilo de unos 2 o 3 metros de longitud y L1 se hace enrollando 50 + 50 vueltas de hilo 28 AWG en un tubo de PVC de 2,5 cm de diámetro o en un pedazo de cable de escoba.

 

La variable (C1) puede obtenerse de una radio valvulada AM fuera de uso y los condensadores tienen las siguientes especificaciones:

C2 - 100 pF - cerámico

C3 - 10 nF - cerámico

C4 - 220 nF - cerámica

 

En la figura 1 el diagrama completo del sistema.

 

Transformando una Radio Valvulada en Transmisor AM
Transformando una Radio Valvulada en Transmisor AM

 

 

La clave tiene por función traer de vuelta el receptor a la función normal.

 

 

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