Este transmisor emite en CW (onda continua) señales telegráficas que se codifican en Morse. En este código, un tacto largo representa un rastro, y un toque corto un punto. Uniendo puntos y trazos formamos el código conforme al Código Morse mostrado más adelante en este libro y encontrado en el sitio del autor.

   Para una bobina de ondas medias el alcance será pequeño, del orden de 10 metros, pero en la banda de ondas cortas, con antena externa podemos llegar a algunos cientos de metros.

   Se trata de un transmisor experimental interesante y simple.

   La alimentación se hará con tensiones entre 6 y 9 V procedentes de la fuente.

 

 

El circuito

   Tenemos, simplemente, un oscilador Hartley donde la frecuencia de operación es determinada por L1 y CV.

   Para el rango de ondas medias L1 se compone de 80 a 100 vueltas de hilo 28 en un bastón de ferrita de 1 cm X 15 cm aproximadamente. Para ondas cortas en el mismo bastón enrollamos 20 espiras para la banda de 15 MHz y aproximadamente 30 espiras para el rango de 7 MHz.

   CV es un capacitor variable de onda media (200 a 400 pF para ajustar la frecuencia de funcionamiento).

   El transistor sugerido es 2N2218 o 2N2222. Para 6 V debe ser utilizado el 2N2222 y para 9 V debe ser empleado 0 2N2218, que posee mayor potencia.

   En el rango de ondas medias podemos experimentar transistores como el TIP31 y BD35 alimentando el circuito con hasta 12 V.

   La bobina L1 tiene una toma central. Para ondas medias L2 consta de 10 vueltas del mismo hilo de L1 enrollado en el mismo núcleo. Para ondas cortas esta bobina consta de 4 o 5 vueltas del mismo hilo.    

 

Montaje

   El circuito completo del transmisor con los valores de los componentes se muestra en la figura 1.

 

Figura 1 - Circuito completo
Figura 1 - Circuito completo | Clique na imagem para ampliar |

 

   

El montaje en una placa de circuito impreso se muestra en la figura 2.

 

Figura 2 - Placa para el montaje
Figura 2 - Placa para el montaje | Clique na imagem para ampliar |

 

   

La antena consiste en un pedazo de hilo estirado de 1 metro a 20 metros, y para mejor desempeño el polo negativo o emisor del transistor deben ser conectados a la tierra.

   Los resistores son de 1/8 o 1/4 W es los capacitores son cerámicos, tipo disco.

   El manipulador puede ser del tipo telegráfico común. o bien improvisado con un interruptor de presión.

   No recomendamos el uso de la batería de 9 V dada la corriente relativamente alta requerida por el circuito que la agotaría rápidamente.

   Si se utiliza, la fuente debe tener un buen filtrado para que no se produzcan zumbidos en la transmisión.

   El receptor utilizado debe ser capaz de sintonizar el rango de señales en el que opera el transmisor.

   

 

Ajuste y uso

   Para comprobar el funcionamiento sintonice en las proximidades un receptor de radio (si es de ondas cortas, asegúrese de que está funcionando correctamente con buena sensibilidad, procurando captar antes algunas estaciones distantes).

   Ajuste entonces la variable para la frecuencia deseada. Para ello, presione el controlador y busque en el radio el "soplo" que corresponda a su omisión. Busque la señal más fuerte, lo que puede comprobarse alejándose del receptor.

   Hecho el ajuste es sólo usar el aparato. Para ello, entrena antes el código con una transmisión compasiva.

   Si utiliza una antena externa, no olvide la conexión a tierra.

 

Q1 - 2N2218 o 2N2222 - transistores NPN de conmutación

L1, L2 - bobinas - ver texto

CV - variable de190 a 410 pF

S1 - Manipulador telegráfico

V1 - 4 o 6 pilas, o una fuente de alimentación de 6 a 9 V

C1 -10 nF - capacitor de cerámica

C2 ~ 100 nF - capacitor de cerámica

R1 - 4K7 a 10 K - resistor (amarillo, violeta, rojo o marrón, negro, rojo)

Varios: caja para montaje, bastón de ferrita, hilos esmaltados, soporte para pilas, antena, etc.

 

 

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