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Page 14 FF525 Installation Manual
3.0.8 Fish Finder Basics
The FF525 consists of a high power transmitter, sensitive receiver and a transducer. The
FF525 sends an electrical pulse to the transducer, which contains an element that converts
the pulse into acoustic (sound) waves, which is sent through the water. As this wave travels
from the transducer to the bottom, it may strike fish, structures, thermoclines (temperature
changes in the water). When the wave strikes an object(s) a certain amount of the wave is
reflected back to the transducer depending on the composition and shape of the object.
When the reflected wave is returned to the transducer it is converted into a voltage and is
amplified by the receiver, processed and sent to the display. The speed of sound in water
is roughly 4800 Ft/sec, so the time lapse between the transmitted signal and the received
echo can be measured and the distance to the object determined.
Figure 3.0.8 - Fish Finder working principle
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