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Basic Principals on how fishfinders work.
Posted by: Andrei Loskoutov on 25-01-2006
 The thrill of any fishing adventure
begins with finding the right place to wet your line. Fishfinder allow anglers
to quickly identify key targets and structure, as well as fish. A Fish Finder
is a subset of a group of instruments called sonars. A Sonar consists of a transmitter,
transducer, receiver and display. In the simplest terms, an electrical impulse
from a transmitter is converted into a sound wave by the transducer and sent
into the water. When this wave strikes an object, it rebounds. This echo strikes
the transducer, which converts it back into an electric signal, which is amplified
by the receiver and sent to the display. Since the speed of sound in water is
constant (approximately 4800 feet per second), the time lapse between the transmitted
signal and the received echo can be measured and the distance to the object
determined. This process repeats itself many times per second.
Display
The display shows a history of the received echoes. The user can make a number
of adjustments to tailor the display to his or her preference, such as senitivity,
the depth range and chart speed. Displays use a variety of technologies, provide
different resolutions and number of shades of gray or color. Each display is
made up of a number of pixels, which are little square blocks that make up the
images. The more pixels and shades of gray or color the better resolution and
image clarity.
Fish Targets
Echoes from fish within the beam will be shown on the display by illuminated
pixels. What image appears on the display depends on a number of factors: the
sensitivity setting on the fishfinder, the cone angle of the transducer, the
speed of the boat, and the size, depth, speed and direction of the fish. A fish
that is swimming directly beneath the boat, it will create a consistent echo
that will cause a continuous line to appear on the display. A stationary fish
caught in a narrow beam transducer appears as a single point on the screen as
the boat passes above it, whereas under the same conditions the fish appears
as an arch if a wide beam transducer is used.
To read moore of How Fish Finders Work, or select Fish Finder that right for
you, please visit our site at: http://www.bystore.org
Almost anyone can now afford to own a unit that will assist in a better fishing.
Andrei Loskoutov |
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