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Appendice tecnica
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Appendice tecnica
Rapporto segnale – disturbo del segnale
Per determinare il rapporto segnale disturbo/del portante (C/N) per
transponder analogici devono essere noti i seguenti valori:
livello di disturbo di base (impostare l’antenna parabolica in modo da
non ricevere segnali satellitari)
max. livello di ricezione
correzione della larghezza di banda
Si applica la seguente formula:
C/N = livello del segnale d’entrata – livello di disturbo base – correzione della
larghezza di banda
ampiezza della banda di misura dell’MSK 24 6 MHz
Valore di correzione della larghezza di banda = 10 log ——————————————–
segnale di ricezione dell’ampiezza di banda RF
Valore di correzione delle larghezze di banda = 6,37 dB con una larghezza di banda (Astra) di 26
MHz
Valore di correzione delle larghezze di banda = 7,78 dB con una larghezza di banda (Eutelsat,
Intelsat, Kopernikus) di 36 MHz
Esempio
livello del segnale di ricezione +75,5 dB con segnale satellitare
livello di disturbo base -55,0 dB senza segnale
satellitare
rapporto segnale – disturbo/del
portante C/N
+20,5 dB
correzione della larghezza di
banda
- 6,4 dB
per ampiezza di banda
di 26 MHz
C/N dell’impianto ricevente +14,1 dB
Indicazione
Per determinare esattamente il C/N si deve assolutamente tenere conto
dell’ampiezza di banda RF del segnale di ricezione.
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