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Apéndice Técnico
49
Technical Appendix
Relación Señal-a-Ruido
Los siguientes valores deben conocerse para poder calcular la relación
de la señal al ruido (C/N) para transpondedores analógicos.
nivel de ruido de fondo (fije la antena parabólica de modo que no se
reciba ninguna señal de satélite)
nivel máximo de recepción
Corrección de ancho de banda.
Esto da la siguiente fórmula:
C/N = nivel de señal de recepción – nivel de ruido de fondo – corrección de
ancho de banda
Ancho de banda medido por MSK 24 (
MHz)
Valor de corrección de ancho de banda = 10 log ——————————————–--
------
Ancho de banda RF de señal de recepción
Valor de corrección de ancho de banda = 6.37 dB a 26 MHz ancho de banda (Astra)
Valor de corrección de ancho de banda = 7.78 dB a 36 MHz (Eutelsat, Intelsat,
Kopernikus)
Ejemplo
Nivel de señal de recepción
+75.5 dB
con señal de
satélite
Nivel de ruido de fondo -55.0 dB sin señal de satélite
Distancia C/N transmisor-a-
ruido
+20.5 dB
Corrección ancho de banda - 6.4 dB
Para ancho de banda
26 MHz
C/N del sistema de
recepción
+14.1 dB
Nota
Para calcular exactamente el C/N, es primordial que tome en cuenta el
ancho de banda RF de la señal de recepción.
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