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FISH 4350/4380 Installation und Bedienung 45
NAVMAN
Frequenz und Sendekegel
Der vom Geber des FISH 4350 / FISH 4380
ausgesendete Impuls breitet sich im Wasser
kegelförmig nach unten aus. Im Kegelzentrum
sind rückkehrende Echos am stärksten. Der
Kegelwinkel ist stark von der Impuls-Frequenz
und der Geber-Bauart abhängig. Der Navman
Heckgeber hat einen Abstrahlwinkel von ca.
15°.
Das Diagramm zeigt die Kegel-Durchmesser
in verschiedenen Tiefen. Es sind angenäherte
Werte.
Tiefe 200 kHz
15°
50
100
150
200
250
0
13
27
40
54
67
Schatten
Schatten sind Bereiche, in die der Ultraschall-Strahl nicht hinein sehen kann. Diese Bereiche
sind Höhlungen im Boden oder Seiten von steilen Felsen und Überhängen, wo die starken
Echos vom felsigen Boden die weichen Echos von Fisch überlagern und auch eine doppelte
Bodenlinie erzeugen können. Dies ist der Fall im folgenden Bildbeispiel. Im Display werden
dabei Bodenechos auf zwei Ebenen gleichzeitig gezeigt.
Sonar-Bild vom selben Bereich
Fisch ist im Display erkennbar
Das Fischecho wird vom starken
Bodenecho überlagert und ist im Display
nicht sichtbar.
Beispiel für Schatten
Fisch ist im Display erkennbar
15


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