Frequency and Depth
One of the key specifications for a fishfinder is its frequency. They are sold in many different frequencies, including 38 kHz, 50 kHz, 120 kHz, 192 kHz 200 kHz and even as high as 455 kHz. Remember this: The high frequencies, say 192 kHz and above are effective for fishing in depths of 400 feet and shallower, while lower frequencies are better suited for deep sounding.
The sounds waves are transmitted in the shape of a cone, like a flashlight beam. Lower frequencies transmit narrower cones, which are more effective in collecting data in deep water. Higher frequencies produce wider cones that are better in shallower water. Many machines can be operated in two or even three different frequencies. So look for a fishfinder with a frequency that suits the depths of your fishing area or a multi-frequency unit that can be tuned as needed.
26.jūnijs 2012, 18:16 |
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