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8120 Installation und Bedienung93
b Unter dem Geber strömt turbulentes
Wasser hindurch. Luftblasen behindern
die Rückkehr von Echos zum Geber, somit
kann das Gerät keine Boden- und andere
Objekt-Echos erkennen. Das passiert
besonders, wenn das Boot rückwärts fährt.
Der Geber muss so angebracht sein, dass
das Wasser bei allen Geschwindigkeiten
möglichst verwirbelungsfrei unter der
Geberfläche hindurch fließt.
c Die Maschine erzeugt elektrische
Störsignale, die vom Gerät aufgenommen
werden. Versuchen, mit einer
Funkentstörung Abhilfe zu schaffen.
4-5 Es wird ein doppeltes Bodenecho
aufgezeichnet:
a Das Boot befindet sich über einer
Bodenformation, das Schatten verursacht
(siehe Abschn. 8-2).
b In flachem Wasser kann das Echo vom
Boot gespiegelt und erneut empfangen
werden. Die Verstärkung reduzieren
(siehe Abschn. 8-6) und/oder die Sende-
Impulsleistung reduzieren (siehe Abschn.
17-3).
c Den Tiefenbereich verkleinern.
93


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