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Technischer Anhang
47
Technischer Anhang
Signal-Rauschabstand
Um den Träger-/Rauschabstand (C/N) für analoge Transponder zu
bestimmen, müssen folgende Werte bekannt sein:
Grundrauschpegel (Parabolantenne so einstellen, dass kein Satelli-
tensignal empfangen wird)
Max. Empfangspegel
Bandbreiten-Korrektur
Dabei gilt folgende Formel:
C/N = Empfangssignal-Pegel - Grundrauschpegel - Bandbreiten-Korrektur
6 MHz (Messbandbreite MSK 25)
Bandbreiten-Korrekturwert = 10 log ---—————————————–--
RF-Bandbreite Empfangssignal
Bandbreiten-Korrekturwert = 6,37 dB bei 26 MHz Bandbreite (ASTRA)
Bandbreiten-Korrekturwert = 7,78 dB bei 36 MHz (EUTELSAT, INTELSAT, Kopernikus)
Beispiel
Empfangssignal-Pegel +75,5 dB mit Satellitensignal
Grundrauschpegel -55,0 dB
ohne Satellitensignal
Träger-/Rauschabstand C/N +20,5 dB
Bandbreitenkorrektur - 6,4 dB
für 26 MHz Bandbreite
C/N der Empfangsanlage
+14,1 dB
Hinweis
Für die genaue Bestimmung des C/N ist unbedingt die RF-Bandbreite
des Empfangssignals zu berücksichtigen.
47


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