Haben Sie schon einmal mit einem 50 Ohm Antennenkabel Ihren Fernseher mit der 75 Ohm Antennenbuchse verbunden? Dann konnten Sie sich ein gutes Bild davon machen, was eine fehlerhafte Impedanzanpassung bewirkt! An den Impedanzsprüngen wird das Signal nicht ungestört weitergeleitet, sondern zum Teil reflektiert. Das zurückgeworfene Signal spiegelt sich wieder an der ersten Sprungstelle und erreicht so den Empfänger mit zeitlicher Verzögerung. Dies äußert sich in den bekannten Geisterbildern. Am Versatz der Geisterbilder können Sie die Länge des Kabels ablesen.
Ähnlich ergeben sich gedämpfte oder verzögerte Signale überall dort, wo mit steilen Flanken bzw. mit höheren Frequenzen verarbeitet wird. Häufig
Ähnlich ergeben sich gedämpfte oder verzögerte Signale überall dort, wo mit steilen Flanken bzw. mit höheren Frequenzen verarbeitet wird. Häufig
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