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FISH 4500/4600 Installatie- en bedieningshandleiding57
NAVMAN
Schaduw
Rond gebieden waar de ultrasonische kegel
niets kan ‘zien’ wordt een schaduw gecreëerd.
Deze gebieden zijn holtes in de bodem of ge-
bieden naast rotsen en richels, waar de sterke
echo’s van de rotsen de zwakke echo’s van
vissen verdoezelen en een dubbel bodemtracé
zouden kunnen creëren. Zie onderstaand voor
een voorbeeld van het sonarbeeldscherm in
zo’n omgeving. U ziet een dubbel bodemtracé
op het beeldscherm.
Als u met de 50 kHz frequentie met de wijde
hoek naar vis zoekt, wees dan verdacht op
een toename in schaduw. Gebruik de hoge
200 kHz frequentie in gebieden met rotsen en
richels omdat deze frequentie het schaduwef-
fect aanmerkelijk reduceert.
Sonarweergave van het-
zelfde gebied
vis is zichtbaar op beeldscherm
vis is verborgen door de sterke echo
van de bodem en is niet op het scherm
zichtbaar
Voorbeeld van schaduw
vis is zichtbaar op het beeldscherm
Water Kegelwijdte Kegelwijdte
diepte bij 50 kHz bij 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
De verschillen in kegelwijdte zijn van invloed
op wat wordt weergegeven. Zie sectie 4-2
Enkele en dubbele frequentie fishfinding.
17


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