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Les langues disponibles
UNDERSTANDING SONAR
If you are familiar with the manipulation of a sonar, please
skip to the next section. However, if you have never owned
any sonar fishfinder yet, this section will teach you the basic
theory about sonar.
Based on the sonar technology, the Echofis h 820 fish-
finder can detect the underwater conditions, including
fish presence or bottom structure. The transducer sends a
sound wave signal into the water in a cone shape. At the
source, the wave is narrow; however as it penetrates
deeper, the sound wave spreads forming a cone (i.e
flashlight). The sound wave bounces back to the transduc-
er when it strikes any object. The object can be a fish, the
structure, the bottom or any other object with a different
density from the water.
The transducer amplifies the return signal and sends it
back to the fishfinder. By measuring the time between the
sound wave transmission and its bounce, the fishfinder can
calculate the distance t ha nk s to t he in ne r microproces-
sor. T h e fishfinder displays the information on the screen
for your interpretation.
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Echofish 820 – Installation & Operation manual
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