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Medición de FM y Espectro
42
Distancia y Nivel de Portadora de Audio
Los transmisores de TV pueden utilizar una segunda portadora de audio
para transmitir información utilizando la modulación FM (analógico) o
formato Nicam (digital). Las diferentes frecuencias están enfocadas a las
portadoras de audio dependiendo del estándar utilizado (véase tabla). El
transmisor de audio 1 siempre es la configuración por defecto después
de que usted haya introducido el canal o frecuencia.
Estándar Transmisor
Audio 1
Trasmisor
Audio 2
Nicam
B/G 5.5 MHz 5.74 MHz 5.85 MHz
D/K 6.5 MHz 6.26 MHz 5.85 MHz
I 6.0 MHz ------ 6.552 MHz
M/N 4.5 MHz 4.72 MHz ------
L AM 6.5 MHz ------ 5.85 MHz
M1 (Japón) 4.5 MHz ------ ------
Cuando se está midiendo la portadora de audio, se mide primeramente
la relación de señal entre las portadoras de audio y video en dB. Luego
se mide el nivel absoluto de la portadora de audio en dBìV.
Durante la medición, los altavoces están en silencio. Después de la
medición, se puede escuchar la última medición de la modulación de la
portadora de audio.
Resumen de los controles de Medición de la Frecuencia de la Portadora de Audio
[2ndF] [SC] Cambia al menú de Portadora Audio
[1]...[2] Cambia entre transmisor de audio 1 y transmisor de
audio 2 (véase tabla).
Manteniendo presionada la tecla de Medición de
Portadora de Audio,
[3] Cambia a recepción Nicam
Ejemplo
Mida la distancia y nivel de portadora de audio, del transmisor de audio
1:
Presione [2ndF] [SC],
Presione ahora [1] y mantenga la tecla presionada.
El display LC muestra los siguientes valores durante aprox. 1 segundo:
Frecuencia de distancia de transmisor de audio: 5.5 MHz
Relación de portadora audio / portadora vídeo: -13 dB
Después de aprox. 1 segundo, se presentará el nivel de transmisor de
audio.
Display LC:
0
ë
SC: 5.50MHz
TV
SC: 5.50MHz
TV
42


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