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FISH 4350/4380 Manual för Installation och Användning 15
NAVMAN
Frekvens och konbredd
Den puls som genereras av FISH 4350:s och
FISH 4380:s givare färdas ner genom vattnet
och sprider sig utåt och bildar en kon. Inuti
konen är retursignalerna som starkast. Konens
bredd beror på givarens konstruktion och
pulsens frekvens: för Navmans medföljande
akterspegelsmonterade givare är den cirka
15°. Diagrammet visar hur konbredden varierar
med djupet för de olika frekvenserna. Siffrorna
är ungefärliga.
Djup 200 kHz
15°
50
100
150
200
250
0
13
27
40
54
67
Ekolodsvisning av samma område
Þ sken syns på skärmen
Þ sken göms av de starka ekona från
botten och syns inte på skärmen
Exempel på skuggor
Þ sken syns på skärmen
Skuggor
Skuggor bildas runt områden som ultraljudsstrålen inte kan ’se’. Det kan handla om håligheter på
botten eller på sidorna av klippor och avsatser där starka ekon från dessa stör de svaga ekona från
Þ sk och det kan också bilden en dubbel bottenkontur. Här kan du se ett exempel på en ekolodsbild
från en sådan omgivning. En dubbel bottenkontur visas på skärmen.
15


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Others manual(s) of Navman FISH 4380

Navman FISH 4380 User Manual - German - 31 pages

Navman FISH 4380 User Manual - Dutch - 31 pages

Navman FISH 4380 User Manual - French - 34 pages

Navman FISH 4380 User Manual - Italian - 32 pages

Navman FISH 4380 User Manual - Portuguese - 35 pages

Navman FISH 4380 User Manual - Spanish - 35 pages


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