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Introduction
Thank you for choosing our fish founder—FS117
The FS117 is a high quality, dual-frequency fish finder. It uses TFT LCD to
provide a color display for easy daylight viewing that can be dimmed for
night fishing. With 8 or 12 colors bar, the colors represent different signal
strengths, making the displays easy to recognize the bottom and fish
schools. You can choose table mounting or flush mounting for optimum
viewing.
FS117 is consist of the following two parts:
¾
Operating & display unit
¾
Transducer
Theory of fish finder
The fish finder converts each echo into an electronic signal, displayed as a
vertical line of pixels. The most recent echo appears on the extreme right of
the display, with the older echoes being scrolled towards the left, eventually
disappearing off the display.
The transducer generates an ultrasonic
pulse, which travels down towards the
bottom at a speed of about 1500m/sec,
spreading out into a cone shape. When the
pulse meets an object, such as a fish or
the bottom, it is partly reflected back up
towards the boat as an echo. The depth of
the object or bottom is calculated by the
fish finder by measuring the time taken
between sending a pulse and receiving the
echo. When an echo has been returned,
the next pulse is sent.
