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FISH 4500/4600 Installation und Bedienung 96
NAVMAN
Boden
Großer
Fisch-
Schwarm
Einzelfisch
Seetang /
Kraut
Harter Bod-
en aus Fels
oder Korall
ergeben ein
breiteres
Echoband
Weiche
den, wie
Schlamm,
Kraut
und Sand
ergeben ein
schmales
Echoband
Kleiner
Fisch-
Schwarm
Bodenarten
Schlamm, Kraut und sandiger Boden erzeugen
gempfte, auseinanderlaufende Echo-Im-
pulse, die schwache Echo-Anzeigen ergeben.
Harter, felsiger oder Korall-Boden reflektieren
ein starkes kurzes Echo, was zu einer kräftigen
Echo-Anzeige führt, siehe Abschn. 5-3.
Entsprechend der verschiedenen Kegel-Durchmesser differieren auch die Echo-Anzeigen,
siehe Abschn. 4-2
Frequenz und Sendekegel
Der vom Geber des FISH 4500/4600 ausgesen-
dete Impuls breitet sich im Wasser kegelförmig
nach unten aus. Der Winkel dieses Kegels ist
stark von der Impulsfrequenz abhängig. Bei 50
kHz sind es ca. 45° und bei 200 kHz ca. 11°.
Das Diagramm zeigt für beide Frequenzen die
Kegel-Durchmesser in verschiedenen Tiefen.
Die Werte sind angenähert.
Wasser Kegeldurchm. Kegeldurchm.
Tiefe bei 50 kHz bei 200 kHz
10 8 2
20 16 4
30 25 6
40 33 7
50 41 9
60 50 11
70 58 13
80 66 15
90 74 17
100 83 19
150 127 26
200 166 38
300 249 58
400 331 77
500 414 96
600 497 116
700 580 135
800 663 154
900 746 173
1000 828 192
Tiefe 50 kHz 200 kHz
45°
1
50
100
150
200
250
0
41
83
127
166
208
9
19
26
38
46
16


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