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TRACKFISH 6600 Manuale Installazione e utilizzo 33
NAVMAN
Zone d’ombra
Nell’intorno delle zone in cui il fascio ultrasonico non può “vedere” si creano delle zone dombra. Queste
zone comprendono gli avvallamenti del fondale o le vicinanze di rocce e scogli; in questi casi i forti echi
riflessi dalle rocce oscurano gli echi più deboli dei pesci ed in alcuni casi possono anche creare una doppia
traccia del fondale. Si veda qui sotto un esempio della schermata sonar relativa ad una tale condizione.
Lo schermo visualizza una doppia traccia del fondale.
Tenere presente che le zone d’ombra aumentano quando si cerca il pesce utilizzando la frequenza di 50
kHz ad ampio angolo. In zone con rocce e scogli, utilizzare la frequenza più alta, di 200 kHz, in quanto
questa frequenza riduce notevolmente le zone d’ombra.
Frequenza ed ampiezza del cono
Schermata sonar della stessa zona
pesce visibile sullo schermo
pesce nascosto dai forti echi riflessi dal
fondo e che non compare sullo schermo
Esempio di zone d’ombra
pesce visibile sullo schermo
Acqua Larghezza del Larghezza del
Profondità cono a 50 kHz cono a 200 kHz
25 20 5
50 40 10
100 80 20
150 130 30
200 170 40
300 250 60
400 330 80
600 500 120
800 660 150
1000 830 190
45° cone
11°
cone
Limpulso sonar generato
dal trasduttore TRACK-
FISH 6600 viaggia in
basso attraverso l’acqua,
diffondendosi verso
l’esterno in forma conica.
Lampiezza del cono
dipende dalla frequenza
dell’impulso; a 50 kHz
è all’incirca 45°, e a 200
kHz è all’incirca 11°.
Le differenze
nell’ampiezza del cono
influenzano ciò che vi-
ene visualizzato. Vedere
la sezione 8-3.
33


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