Para ayudar a aumentar la intensidad de las señales que llegan a su televisor, en una ubicación de recepción de TV (*) en VHF y FM difícil, damos un circuito reforzador o booster bastante eficiente.

(*) Este reforzador sólo se puede utilizar en el caso de TV antiguas analógicas en el rango de VHF.

Este circuito debe estar junto a la antena del televisor o lo más cerca posible de ella (y no junto al televisor o radio) debiendo ser alimentado por una fuente que también daremos en el artículo. En la figura 1 tenemos el diagrama completo del reforzador.

 

 

Figura 1 - Diagrama del reforzador
Figura 1 - Diagrama del reforzador

 

La disposición de los componentes en una placa de circuito impreso se muestra en la figura 2.

 

Figura 2 - Placa de circuito impreso del reforzador
Figura 2 - Placa de circuito impreso del reforzador

 

La bobina L1 está formada por 11 espiras de hilo de 0,5 mm de diámetro enrolladas en una forma de 0,5 cm de diámetro con núcleo de ferrita. La toma o derivación se realiza en la cuarta espira desde el lado de la tierra. Observe que la salida de este circuito es para cable coaxial de 75 ohms. El circuito amplificará bien las señales de los canales entre 4 y 11. Para alcanzar también los canales más bajos se debe aumentar el número de espiras de la bobina. Para alcanzar canales más altos se debe disminuir el número de espiras de la bobina.

La fuente de alimentación se muestra en la figura 3.

 

Figura 3 - Fuente de alimentación para el reforzador
Figura 3 - Fuente de alimentación para el reforzador

 

El consumo de energía del aparato es muy bajo, pero es conveniente apagar la fuente cuando el aparato y el televisor (o FM) están fuera de uso. La instalación del sistema se realiza como se muestra en la figura 4.

 

Figura 4 - Modo de instalar el reforzador.
Figura 4 - Modo de instalar el reforzador.

 

Para utilizar, basta con conectar el aparato y el televisor en el canal que tenga dificultades de recepción y ajustar CV para un mejor nivel de señal. Después de eso, es sólo cerrar la caja del aparato vedándola de modo que no sufra la acción de la lluvia.

Obs: El reforzador refuerza las señales que llegan a la antena. Si las señales no alcanzan o están por debajo del nivel de ruido, el aparato no servirá, ya que también ampliará el ruido.

 

a) Reforzador

Semiconductores:

Q1 - BF970 - transistores PNP de RF

 

Resistores: (1/8 W, 5%)

R1 - 560 ohms

R2 - 3,9 k ohms

R3 - 10 k ohms

 

Capacitores:

C1, C2 - 47 pF - cerámicos

C3 - 100 nF - cerámica

CV - trimmer 3-30 a 5-50 pF

 

Varios:

L1 - Bobina - ver el texto

J1 - conector de salida de 75 ohms

Placa de circuito impreso, hilos, soldadura, etc.

 

b) Fuente

T1 - Transformador con primario según la red de energía y secundario de 12 + 12V x 250 mA

D1, D2 - 1N4002 - diodos

C1 - 470 uF x 25V - capacitor electrolítico

 

Varios:

Cable de fuerza, caja para montaje, hilos, soldadura, etc.

 

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